04 Oct, 2015
1 commit
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Pull strscpy string copy function implementation from Chris Metcalf.
Chris sent this during the merge window, but I waffled back and forth on
the pull request, which is why it's going in only now.The new "strscpy()" function is definitely easier to use and more secure
than either strncpy() or strlcpy(), both of which are horrible nasty
interfaces that have serious and irredeemable problems.strncpy() has a useless return value, and doesn't NUL-terminate an
overlong result. To make matters worse, it pads a short result with
zeroes, which is a performance disaster if you have big buffers.strlcpy(), by contrast, is a mis-designed "fix" for strlcpy(), lacking
the insane NUL padding, but having a differently broken return value
which returns the original length of the source string. Which means
that it will read characters past the count from the source buffer, and
you have to trust the source to be properly terminated. It also makes
error handling fragile, since the test for overflow is unnecessarily
subtle.strscpy() avoids both these problems, guaranteeing the NUL termination
(but not excessive padding) if the destination size wasn't zero, and
making the overflow condition very obvious by returning -E2BIG. It also
doesn't read past the size of the source, and can thus be used for
untrusted source data too.So why did I waffle about this for so long?
Every time we introduce a new-and-improved interface, people start doing
these interminable series of trivial conversion patches.And every time that happens, somebody does some silly mistake, and the
conversion patch to the improved interface actually makes things worse.
Because the patch is mindnumbing and trivial, nobody has the attention
span to look at it carefully, and it's usually done over large swatches
of source code which means that not every conversion gets tested.So I'm pulling the strscpy() support because it *is* a better interface.
But I will refuse to pull mindless conversion patches. Use this in
places where it makes sense, but don't do trivial patches to fix things
that aren't actually known to be broken.* 'strscpy' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
tile: use global strscpy() rather than private copy
string: provide strscpy()
Make asm/word-at-a-time.h available on all architectures
26 Sep, 2015
1 commit
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Pull networking fixes from David Miller:
1) When we run a tap on netlink sockets, we have to copy mmap'd SKBs
instead of cloning them. From Daniel Borkmann.2) When converting classical BPF into eBPF, fix the setting of the
source reg to BPF_REG_X. From Tycho Andersen.3) Fix igmpv3/mldv2 report parsing in the bridge multicast code, from
Linus Lussing.4) Fix dst refcounting for ipv6 tunnels, from Martin KaFai Lau.
5) Set NLM_F_REPLACE flag properly when replacing ipv6 routes, from
Roopa Prabhu.6) Add some new cxgb4 PCI device IDs, from Hariprasad Shenai.
7) Fix headroom tests and SKB leaks in ipv6 fragmentation code, from
Florian Westphal.8) Check DMA mapping errors in bna driver, from Ivan Vecera.
9) Several 8139cp bug fixes (dev_kfree_skb_any in interrupt context,
misclearing of interrupt status in TX timeout handler, etc.) from
David Woodhouse.10) In tipc, reset SKB header pointer after skb_linearize(), from Erik
Hugne.11) Fix autobind races et al. in netlink code, from Herbert Xu with
help from Tejun Heo and others.12) Missing SET_NETDEV_DEV in sunvnet driver, from Sowmini Varadhan.
13) Fix various races in timewait timer and reqsk_queue_hadh_req, from
Eric Dumazet.14) Fix array overruns in mac80211, from Johannes Berg and Dan
Carpenter.15) Fix data race in rhashtable_rehash_one(), from Dmitriy Vyukov.
16) Fix race between poll_one_napi and napi_disable, from Neil Horman.
17) Fix byte order in geneve tunnel port config, from John W Linville.
18) Fix handling of ARP replies over lightweight tunnels, from Jiri
Benc.19) We can loop when fib rule dumps cross multiple SKBs, fix from Wilson
Kok and Roopa Prabhu.20) Several reference count handling bug fixes in the PHY/MDIO layer
from Russel King.21) Fix lockdep splat in ppp_dev_uninit(), from Guillaume Nault.
22) Fix crash in icmp_route_lookup(), from David Ahern.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (116 commits)
net: Fix panic in icmp_route_lookup
net: update docbook comment for __mdiobus_register()
ppp: fix lockdep splat in ppp_dev_uninit()
net: via/Kconfig: GENERIC_PCI_IOMAP required if PCI not selected
phy: marvell: add link partner advertised modes
net: fix net_device refcounting
phy: add phy_device_remove()
phy: fixed-phy: properly validate phy in fixed_phy_update_state()
net: fix phy refcounting in a bunch of drivers
of_mdio: fix MDIO phy device refcounting
phy: add proper phy struct device refcounting
phy: fix mdiobus module safety
net: dsa: fix of_mdio_find_bus() device refcount leak
phy: fix of_mdio_find_bus() device refcount leak
ip6_tunnel: Reduce log level in ip6_tnl_err() to debug
ip6_gre: Reduce log level in ip6gre_err() to debug
fib_rules: fix fib rule dumps across multiple skbs
bnx2x: byte swap rss_key to comply to Toeplitz specs
net: revert "net_sched: move tp->root allocation into fw_init()"
lwtunnel: remove source and destination UDP port config option
...
23 Sep, 2015
2 commits
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rhashtable_rehash_one() uses complex logic to update entry->next field,
after INIT_RHT_NULLS_HEAD and NULLS_MARKER expansion:entry->next = 1 | ((base + off) << 1)
This can be compiled along the lines of:
entry->next = base + off
entry->next <next |= 1Which will break concurrent readers.
NULLS value recomputation is not needed here, so just remove
the complex logic.The data race was found with KernelThreadSanitizer (KTSAN).
Signed-off-by: Dmitry Vyukov
Acked-by: Eric Dumazet
Acked-by: Thomas Graf
Acked-by: Herbert Xu
Signed-off-by: David S. Miller -
The check for invoking iommu->lazy_flush() from iommu_tbl_range_alloc()
has to be refactored so that we only call ->lazy_flush() if it is
non-null.I had a sparc kernel that was crashing when I was trying to process some
very large perf.data files- the crash happens when the scsi driver calls
into dma_4v_map_sg and thus the iommu_tbl_range_alloc().Signed-off-by: Sowmini Varadhan
Cc: Benjamin Herrenschmidt
Cc: Guenter Roeck
Cc: David S. Miller
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
18 Sep, 2015
1 commit
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Some string_get_size() calls (e.g.:
string_get_size(1, 512, STRING_UNITS_10, ..., ...)
string_get_size(15, 64, STRING_UNITS_10, ..., ...)
) result in an infinite loop. The problem is that if size is equal to
divisor[units]/blk_size and is smaller than divisor[units] we'll end
up with size == 0 when we start doing sf_cap calculations:For string_get_size(1, 512, STRING_UNITS_10, ..., ...) case:
...
remainder = do_div(size, divisor[units]); -> size is 0, remainder is 1
remainder *= blk_size; -> remainder is 512
...
size *= blk_size; -> size is still 0
size += remainder / divisor[units]; -> size is still 0The caller causing the issue is sd_read_capacity(), the problem was
noticed on Hyper-V, such weird size was reported by host when scanning
collides with device removal. This is probably a separate issue worth
fixing, this patch is intended to prevent the library routine from
infinite looping.Signed-off-by: Vitaly Kuznetsov
Acked-by: James Bottomley
Cc: Andy Shevchenko
Cc: Rasmus Villemoes
Cc: "K. Y. Srinivasan"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
11 Sep, 2015
12 commits
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Remove bi_reverse() and use generic bitrev32() instead - it should have
better performance on some platforms.Signed-off-by: yalin wang
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Compare pointer-typed values to NULL rather than 0.
The semantic patch that makes this change is available
in scripts/coccinelle/null/badzero.cocci.Signed-off-by: Fabio Estevam
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
When loading x86 64bit kernel above 4GiB with patched grub2, got kernel
gunzip error.| early console in decompress_kernel
| decompress_kernel:
| input: [0x807f2143b4-0x807ff61aee]
| output: [0x807cc00000-0x807f3ea29b] 0x027ea29c: output_len
| boot via startup_64
| KASLR using RDTSC...
| new output: [0x46fe000000-0x470138cfff] 0x0338d000: output_run_size
| decompress: [0x46fe000000-0x47007ea29b]
Cc: Alexandre Courbot
Cc: Jon Medhurst
Cc: Stephen Warren
Cc: "H. Peter Anvin"
Cc: Thomas Gleixner
Cc: Ingo Molnar
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
In kmalloc_oob_krealloc_less, I think it is better to test
the size2 boundary.If we do not call krealloc, the access of position size1 will still cause
out-of-bounds and access of position size2 does not. After call krealloc,
the access of position size2 cause out-of-bounds. So using size2 is more
correct.Signed-off-by: Wang Long
Cc: Andrey Ryabinin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Signed-off-by: Wang Long
Cc: Andrey Ryabinin
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
To further clarify the purpose of the "esc" argument, rename it to "only"
to reflect that it is a limit, not a list of additional characters to
escape.Signed-off-by: Kees Cook
Suggested-by: Rasmus Villemoes
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The esc argument is used to reduce which characters will be escaped. For
example, using " " with ESCAPE_SPACE will not produce any escaped spaces.Signed-off-by: Kees Cook
Cc: Andy Shevchenko
Cc: Rasmus Villemoes
Cc: Mathias Krause
Cc: James Bottomley
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
In __bitmap_parselist we can accept whitespaces on head or tail during
every parsing procedure. If input has valid ranges, there is no reason to
reject the user.For example, bitmap_parselist(" 1-3, 5, ", &mask, nmaskbits). After
separating the string, we get " 1-3", " 5", and " ". It's possible and
reasonable to accept such string as long as the parsing result is correct.Signed-off-by: Pan Xinhui
Cc: Yury Norov
Cc: Chris Metcalf
Cc: Rasmus Villemoes
Cc: Sudeep Holla
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
If string end with '-', for exapmle, bitmap_parselist("1,0-",&mask,
nmaskbits), It is not in a valid pattern, so add a check after loop.
Return -EINVAL on such condition.Signed-off-by: Pan Xinhui
Cc: Yury Norov
Cc: Chris Metcalf
Cc: Rasmus Villemoes
Cc: Sudeep Holla
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
We can avoid in-loop incrementation of ndigits. Save current totaldigits
to ndigits before loop, and check ndigits against totaldigits after the
loop.Signed-off-by: Pan Xinhui
Cc: Yury Norov
Cc: Chris Metcalf
Cc: Rasmus Villemoes
Cc: Sudeep Holla
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
strtol(3) et al accept "-0", so should we.
Signed-off-by: Alexey Dobriyan
Cc: David Howells
Cc: Jan Kara
Cc: Joel Becker
Cc: Mark Fasheh
Cc: Theodore Ts'o
Cc: Rasmus Villemoes
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The strscpy() API is intended to be used instead of strlcpy(),
and instead of most uses of strncpy().- Unlike strlcpy(), it doesn't read from memory beyond (src + size).
- Unlike strlcpy() or strncpy(), the API provides an easy way to check
for destination buffer overflow: an -E2BIG error return value.- The provided implementation is robust in the face of the source
buffer being asynchronously changed during the copy, unlike the
current implementation of strlcpy().- Unlike strncpy(), the destination buffer will be NUL-terminated
if the string in the source buffer is too long.- Also unlike strncpy(), the destination buffer will not be updated
beyond the NUL termination, avoiding strncpy's behavior of zeroing
the entire tail end of the destination buffer. (A memset() after
the strscpy() can be used if this behavior is desired.)- The implementation should be reasonably performant on all
platforms since it uses the asm/word-at-a-time.h API rather than
simple byte copy. Kernel-to-kernel string copy is not considered
to be performance critical in any case.Signed-off-by: Chris Metcalf
09 Sep, 2015
5 commits
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Merge second patch-bomb from Andrew Morton:
"Almost all of the rest of MM. There was an unusually large amount of
MM material this time"* emailed patches from Andrew Morton : (141 commits)
zpool: remove no-op module init/exit
mm: zbud: constify the zbud_ops
mm: zpool: constify the zpool_ops
mm: swap: zswap: maybe_preload & refactoring
zram: unify error reporting
zsmalloc: remove null check from destroy_handle_cache()
zsmalloc: do not take class lock in zs_shrinker_count()
zsmalloc: use class->pages_per_zspage
zsmalloc: consider ZS_ALMOST_FULL as migrate source
zsmalloc: partial page ordering within a fullness_list
zsmalloc: use shrinker to trigger auto-compaction
zsmalloc: account the number of compacted pages
zsmalloc/zram: introduce zs_pool_stats api
zsmalloc: cosmetic compaction code adjustments
zsmalloc: introduce zs_can_compact() function
zsmalloc: always keep per-class stats
zsmalloc: drop unused variable `nr_to_migrate'
mm/memblock.c: fix comment in __next_mem_range()
mm/page_alloc.c: fix type information of memoryless node
memory-hotplug: fix comments in zone_spanned_pages_in_node() and zone_spanned_pages_in_node()
... -
CMA reserved memory is not part of total reserved memory. Currently
when we print the total reserve memory it considers cma as part of
reserve memory and do minus of totalcma_pages from reserved, which is
wrong. In cases where total reserved is less than cma reserved we will
get negative values & while printing we print as unsigned and we will
get a very large value.Below is the show mem output on X86 ubuntu based system where CMA
reserved is 100MB (25600 pages) & total reserved is ~40MB(10316 pages).
And reserve memory shows a large value because of this bug.Before:
[ 127.066430] 898908 pages RAM
[ 127.066432] 671682 pages HighMem/MovableOnly
[ 127.066434] 4294952012 pages reserved
[ 127.066436] 25600 pages cma reservedAfter:
[ 44.663129] 898908 pages RAM
[ 44.663130] 671682 pages HighMem/MovableOnly
[ 44.663130] 10316 pages reserved
[ 44.663131] 25600 pages cma reservedSigned-off-by: Vishnu Pratap Singh
Cc: Michal Nazarewicz
Cc: Marek Szyprowski
Cc: Joonsoo Kim
Cc: Laurent Pinchart
Cc: Sasha Levin
Cc: Danesh Petigara
Cc: Laura Abbott
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Pull libnvdimm updates from Dan Williams:
"This update has successfully completed a 0day-kbuild run and has
appeared in a linux-next release. The changes outside of the typical
drivers/nvdimm/ and drivers/acpi/nfit.[ch] paths are related to the
removal of IORESOURCE_CACHEABLE, the introduction of memremap(), and
the introduction of ZONE_DEVICE + devm_memremap_pages().Summary:
- Introduce ZONE_DEVICE and devm_memremap_pages() as a generic
mechanism for adding device-driver-discovered memory regions to the
kernel's direct map.This facility is used by the pmem driver to enable pfn_to_page()
operations on the page frames returned by DAX ('direct_access' in
'struct block_device_operations').For now, the 'memmap' allocation for these "device" pages comes
from "System RAM". Support for allocating the memmap from device
memory will arrive in a later kernel.- Introduce memremap() to replace usages of ioremap_cache() and
ioremap_wt(). memremap() drops the __iomem annotation for these
mappings to memory that do not have i/o side effects. The
replacement of ioremap_cache() with memremap() is limited to the
pmem driver to ease merging the api change in v4.3.Completion of the conversion is targeted for v4.4.
- Similar to the usage of memcpy_to_pmem() + wmb_pmem() in the pmem
driver, update the VFS DAX implementation and PMEM api to provide
persistence guarantees for kernel operations on a DAX mapping.- Convert the ACPI NFIT 'BLK' driver to map the block apertures as
cacheable to improve performance.- Miscellaneous updates and fixes to libnvdimm including support for
issuing "address range scrub" commands, clarifying the optimal
'sector size' of pmem devices, a clarification of the usage of the
ACPI '_STA' (status) property for DIMM devices, and other minor
fixes"* tag 'libnvdimm-for-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: (34 commits)
libnvdimm, pmem: direct map legacy pmem by default
libnvdimm, pmem: 'struct page' for pmem
libnvdimm, pfn: 'struct page' provider infrastructure
x86, pmem: clarify that ARCH_HAS_PMEM_API implies PMEM mapped WB
add devm_memremap_pages
mm: ZONE_DEVICE for "device memory"
mm: move __phys_to_pfn and __pfn_to_phys to asm/generic/memory_model.h
dax: drop size parameter to ->direct_access()
nd_blk: change aperture mapping from WC to WB
nvdimm: change to use generic kvfree()
pmem, dax: have direct_access use __pmem annotation
dax: update I/O path to do proper PMEM flushing
pmem: add copy_from_iter_pmem() and clear_pmem()
pmem, x86: clean up conditional pmem includes
pmem: remove layer when calling arch_has_wmb_pmem()
pmem, x86: move x86 PMEM API to new pmem.h header
libnvdimm, e820: make CONFIG_X86_PMEM_LEGACY a tristate option
pmem: switch to devm_ allocations
devres: add devm_memremap
libnvdimm, btt: write and validate parent_uuid
... -
Pull security subsystem updates from James Morris:
"Highlights:- PKCS#7 support added to support signed kexec, also utilized for
module signing. See comments in 3f1e1bea.** NOTE: this requires linking against the OpenSSL library, which
must be installed, e.g. the openssl-devel on Fedora **- Smack
- add IPv6 host labeling; ignore labels on kernel threads
- support smack labeling mounts which use binary mount data- SELinux:
- add ioctl whitelisting (see
http://kernsec.org/files/lss2015/vanderstoep.pdf)
- fix mprotect PROT_EXEC regression caused by mm change- Seccomp:
- add ptrace options for suspend/resume"* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (57 commits)
PKCS#7: Add OIDs for sha224, sha284 and sha512 hash algos and use them
Documentation/Changes: Now need OpenSSL devel packages for module signing
scripts: add extract-cert and sign-file to .gitignore
modsign: Handle signing key in source tree
modsign: Use if_changed rule for extracting cert from module signing key
Move certificate handling to its own directory
sign-file: Fix warning about BIO_reset() return value
PKCS#7: Add MODULE_LICENSE() to test module
Smack - Fix build error with bringup unconfigured
sign-file: Document dependency on OpenSSL devel libraries
PKCS#7: Appropriately restrict authenticated attributes and content type
KEYS: Add a name for PKEY_ID_PKCS7
PKCS#7: Improve and export the X.509 ASN.1 time object decoder
modsign: Use extract-cert to process CONFIG_SYSTEM_TRUSTED_KEYS
extract-cert: Cope with multiple X.509 certificates in a single file
sign-file: Generate CMS message as signature instead of PKCS#7
PKCS#7: Support CMS messages also [RFC5652]
X.509: Change recorded SKID & AKID to not include Subject or Issuer
PKCS#7: Check content type and versions
MAINTAINERS: The keyrings mailing list has moved
... -
Pull NMI backtrace update from Russell King:
"These changes convert the x86 NMI handling to be a library
implementation which other architectures can make use of. Thomas
Gleixner has reviewed and tested these changes, and wishes me to send
these rather than taking them through the tip tree.The final patch in the set adds an initial implementation using this
infrastructure to ARM, even though it doesn't send the IPI at "NMI"
level. Patches are in progress to add the ARM equivalent of NMI, but
we still need the IRQ-level fallback for systems where the "NMI" isn't
available due to secure firmware denying access to it"* 'nmi' of git://ftp.arm.linux.org.uk/~rmk/linux-arm:
ARM: add basic support for on-demand backtrace of other CPUs
nmi: x86: convert to generic nmi handler
nmi: create generic NMI backtrace implementation
06 Sep, 2015
2 commits
-
Pull vfs updates from Al Viro:
"In this one:- d_move fixes (Eric Biederman)
- UFS fixes (me; locking is mostly sane now, a bunch of bugs in error
handling ought to be fixed)- switch of sb_writers to percpu rwsem (Oleg Nesterov)
- superblock scalability (Josef Bacik and Dave Chinner)
- swapon(2) race fix (Hugh Dickins)"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (65 commits)
vfs: Test for and handle paths that are unreachable from their mnt_root
dcache: Reduce the scope of i_lock in d_splice_alias
dcache: Handle escaped paths in prepend_path
mm: fix potential data race in SyS_swapon
inode: don't softlockup when evicting inodes
inode: rename i_wb_list to i_io_list
sync: serialise per-superblock sync operations
inode: convert inode_sb_list_lock to per-sb
inode: add hlist_fake to avoid the inode hash lock in evict
writeback: plug writeback at a high level
change sb_writers to use percpu_rw_semaphore
shift percpu_counter_destroy() into destroy_super_work()
percpu-rwsem: kill CONFIG_PERCPU_RWSEM
percpu-rwsem: introduce percpu_rwsem_release() and percpu_rwsem_acquire()
percpu-rwsem: introduce percpu_down_read_trylock()
document rwsem_release() in sb_wait_write()
fix the broken lockdep logic in __sb_start_write()
introduce __sb_writers_{acquired,release}() helpers
ufs_inode_get{frag,block}(): get rid of 'phys' argument
ufs_getfrag_block(): tidy up a bit
... -
Pull md updates from Neil Brown:
- an assortment of little fixes, several for minor races only likely to
be hit during testing- further cluster-md-raid1 development, not ready for real use yet.
- new RAID6 syndrome code for ARM NEON
- fix a race where a write can return before failure of one device is
properly recorded in metadata, so an immediate crash might result in
that write being lost.* tag 'md/4.3' of git://neil.brown.name/md: (33 commits)
md/raid5: ensure device failure recorded before write request returns.
md/raid5: use bio_list for the list of bios to return.
md/raid10: ensure device failure recorded before write request returns.
md/raid1: ensure device failure recorded before write request returns.
md-cluster: remove inappropriate try_module_get from join()
md: extend spinlock protection in register_md_cluster_operations
md-cluster: Read the disk bitmap sb and check if it needs recovery
md-cluster: only call complete(&cinfo->completion) when node join cluster
md-cluster: add missed lockres_free
md-cluster: remove the unused sb_lock
md-cluster: init suspend_list and suspend_lock early in join
md-cluster: add the error check if failed to get dlm lock
md-cluster: init completion within lockres_init
md-cluster: fix deadlock issue on message lock
md-cluster: transfer the resync ownership to another node
md-cluster: split recover_slot for future code reuse
md-cluster: use %pU to print UUIDs
md: setup safemode_timer before it's being used
md/raid5: handle possible race as reshape completes.
md: sync sync_completed has correct value as recovery finishes.
...
05 Sep, 2015
3 commits
-
There were a few conflicts that are fairly easy to resolve.
Signed-off-by: NeilBrown
-
This change fills devm_gen_pool_create()/gen_pool_get() "name" argument
stub with contents and extends of_gen_pool_get() functionality on this
basis.If there is no associated platform device with a device node passed to
of_gen_pool_get(), the function attempts to get a label property or device
node name (= repeats MTD OF partition standard) and seeks for a named
gen_pool registered by device of the parent device node.The main idea of the change is to allow registration of independent
gen_pools under the same umbrella device, say "partitions" on "storage
device", the original functionality of one "partition" per "storage
device" is untouched.[akpm@linux-foundation.org: fix constness in devres_find()]
[dan.carpenter@oracle.com: freeing const data pointers]
Signed-off-by: Vladimir Zapolskiy
Cc: Philipp Zabel
Cc: Greg Kroah-Hartman
Cc: Russell King
Cc: Nicolas Ferre
Cc: Alexandre Belloni
Cc: Jean-Christophe Plagniol-Villard
Cc: Shawn Guo
Cc: Sascha Hauer
Cc: Mauro Carvalho Chehab
Cc: Arnd Bergmann
Signed-off-by: Dan Carpenter
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This change modifies gen_pool_get() and devm_gen_pool_create() client
interfaces adding one more argument "name" of a gen_pool object.Due to implementation gen_pool_get() is capable to retrieve only one
gen_pool associated with a device even if multiple gen_pools are created,
fortunately right at the moment it is sufficient for the clients, hence
provide NULL as a valid argument on both producer devm_gen_pool_create()
and consumer gen_pool_get() sides.Because only one created gen_pool per device is addressable, explicitly
add a restriction to devm_gen_pool_create() to create only one gen_pool
per device, this implies two possible error codes returned by the
function, account it on client side (only misc/sram). This completes
client side changes related to genalloc updates.[akpm@linux-foundation.org: gen_pool_get() cleanup]
Signed-off-by: Vladimir Zapolskiy
Cc: Philipp Zabel
Cc: Greg Kroah-Hartman
Cc: Russell King
Cc: Nicolas Ferre
Cc: Alexandre Belloni
Cc: Jean-Christophe Plagniol-Villard
Cc: Shawn Guo
Cc: Sascha Hauer
Cc: Mauro Carvalho Chehab
Cc: Arnd Bergmann
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
04 Sep, 2015
1 commit
-
Pull locking and atomic updates from Ingo Molnar:
"Main changes in this cycle are:- Extend atomic primitives with coherent logic op primitives
(atomic_{or,and,xor}()) and deprecate the old partial APIs
(atomic_{set,clear}_mask())The old ops were incoherent with incompatible signatures across
architectures and with incomplete support. Now every architecture
supports the primitives consistently (by Peter Zijlstra)- Generic support for 'relaxed atomics':
- _acquire/release/relaxed() flavours of xchg(), cmpxchg() and {add,sub}_return()
- atomic_read_acquire()
- atomic_set_release()This came out of porting qwrlock code to arm64 (by Will Deacon)
- Clean up the fragile static_key APIs that were causing repeat bugs,
by introducing a new one:DEFINE_STATIC_KEY_TRUE(name);
DEFINE_STATIC_KEY_FALSE(name);which define a key of different types with an initial true/false
value.Then allow:
static_branch_likely()
static_branch_unlikely()to take a key of either type and emit the right instruction for the
case. To be able to know the 'type' of the static key we encode it
in the jump entry (by Peter Zijlstra)- Static key self-tests (by Jason Baron)
- qrwlock optimizations (by Waiman Long)
- small futex enhancements (by Davidlohr Bueso)
- ... and misc other changes"
* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (63 commits)
jump_label/x86: Work around asm build bug on older/backported GCCs
locking, ARM, atomics: Define our SMP atomics in terms of _relaxed() operations
locking, include/llist: Use linux/atomic.h instead of asm/cmpxchg.h
locking/qrwlock: Make use of _{acquire|release|relaxed}() atomics
locking/qrwlock: Implement queue_write_unlock() using smp_store_release()
locking/lockref: Remove homebrew cmpxchg64_relaxed() macro definition
locking, asm-generic: Add _{relaxed|acquire|release}() variants for 'atomic_long_t'
locking, asm-generic: Rework atomic-long.h to avoid bulk code duplication
locking/atomics: Add _{acquire|release|relaxed}() variants of some atomic operations
locking, compiler.h: Cast away attributes in the WRITE_ONCE() magic
locking/static_keys: Make verify_keys() static
jump label, locking/static_keys: Update docs
locking/static_keys: Provide a selftest
jump_label: Provide a self-test
s390/uaccess, locking/static_keys: employ static_branch_likely()
x86, tsc, locking/static_keys: Employ static_branch_likely()
locking/static_keys: Add selftest
locking/static_keys: Add a new static_key interface
locking/static_keys: Rework update logic
locking/static_keys: Add static_key_{en,dis}able() helpers
...
03 Sep, 2015
2 commits
-
Pull networking updates from David Miller:
"Another merge window, another set of networking changes. I've heard
rumblings that the lightweight tunnels infrastructure has been voted
networking change of the year. But what do I know?1) Add conntrack support to openvswitch, from Joe Stringer.
2) Initial support for VRF (Virtual Routing and Forwarding), which
allows the segmentation of routing paths without using multiple
devices. There are some semantic kinks to work out still, but
this is a reasonably strong foundation. From David Ahern.3) Remove spinlock fro act_bpf fast path, from Alexei Starovoitov.
4) Ignore route nexthops with a link down state in ipv6, just like
ipv4. From Andy Gospodarek.5) Remove spinlock from fast path of act_gact and act_mirred, from
Eric Dumazet.6) Document the DSA layer, from Florian Fainelli.
7) Add netconsole support to bcmgenet, systemport, and DSA. Also
from Florian Fainelli.8) Add Mellanox Switch Driver and core infrastructure, from Jiri
Pirko.9) Add support for "light weight tunnels", which allow for
encapsulation and decapsulation without bearing the overhead of a
full blown netdevice. From Thomas Graf, Jiri Benc, and a cast of
others.10) Add Identifier Locator Addressing support for ipv6, from Tom
Herbert.11) Support fragmented SKBs in iwlwifi, from Johannes Berg.
12) Allow perf PMUs to be accessed from eBPF programs, from Kaixu Xia.
13) Add BQL support to 3c59x driver, from Loganaden Velvindron.
14) Stop using a zero TX queue length to mean that a device shouldn't
have a qdisc attached, use an explicit flag instead. From Phil
Sutter.15) Use generic geneve netdevice infrastructure in openvswitch, from
Pravin B Shelar.16) Add infrastructure to avoid re-forwarding a packet in software
that was already forwarded by a hardware switch. From Scott
Feldman.17) Allow AF_PACKET fanout function to be implemented in a bpf
program, from Willem de Bruijn"* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1458 commits)
netfilter: nf_conntrack: make nf_ct_zone_dflt built-in
netfilter: nf_dup{4, 6}: fix build error when nf_conntrack disabled
net: fec: clear receive interrupts before processing a packet
ipv6: fix exthdrs offload registration in out_rt path
xen-netback: add support for multicast control
bgmac: Update fixed_phy_register()
sock, diag: fix panic in sock_diag_put_filterinfo
flow_dissector: Use 'const' where possible.
flow_dissector: Fix function argument ordering dependency
ixgbe: Resolve "initialized field overwritten" warnings
ixgbe: Remove bimodal SR-IOV disabling
ixgbe: Add support for reporting 2.5G link speed
ixgbe: fix bounds checking in ixgbe_setup_tc for 82598
ixgbe: support for ethtool set_rxfh
ixgbe: Avoid needless PHY access on copper phys
ixgbe: cleanup to use cached mask value
ixgbe: Remove second instance of lan_id variable
ixgbe: use kzalloc for allocating one thing
flow: Move __get_hash_from_flowi{4,6} into flow_dissector.c
ixgbe: Remove unused PCI bus types
... -
Pull SG updates from Jens Axboe:
"This contains a set of scatter-gather related changes/fixes for 4.3:- Add support for limited chaining of sg tables even for
architectures that do not set ARCH_HAS_SG_CHAIN. From Christoph.- Add sg chain support to target_rd. From Christoph.
- Fixup open coded sg->page_link in crypto/omap-sham. From
Christoph.- Fixup open coded crypto ->page_link manipulation. From Dan.
- Also from Dan, automated fixup of manual sg_unmark_end()
manipulations.- Also from Dan, automated fixup of open coded sg_phys()
implementations.- From Robert Jarzmik, addition of an sg table splitting helper that
drivers can use"* 'for-4.3/sg' of git://git.kernel.dk/linux-block:
lib: scatterlist: add sg splitting function
scatterlist: use sg_phys()
crypto/omap-sham: remove an open coded access to ->page_link
scatterlist: remove open coded sg_unmark_end instances
crypto: replace scatterwalk_sg_chain with sg_chain
target/rd: always chain S/G list
scatterlist: allow limited chaining without ARCH_HAS_SG_CHAIN
02 Sep, 2015
2 commits
-
Pull power management and ACPI updates from Rafael Wysocki:
"From the number of commits perspective, the biggest items are ACPICA
and cpufreq changes with the latter taking the lead (over 50 commits).On the cpufreq front, there are many cleanups and minor fixes in the
core and governors, driver updates etc. We also have a new cpufreq
driver for Mediatek MT8173 chips.ACPICA mostly updates its debug infrastructure and adds a number of
fixes and cleanups for a good measure.The Operating Performance Points (OPP) framework is updated with new
DT bindings and support for them among other things.We have a few updates of the generic power domains framework and a
reorganization of the ACPI device enumeration code and bus type
operations.And a lot of fixes and cleanups all over.
Included is one branch from the MFD tree as it contains some
PM-related driver core and ACPI PM changes a few other commits are
based on.Specifics:
- ACPICA update to upstream revision 20150818 including method
tracing extensions to allow more in-depth AML debugging in the
kernel and a number of assorted fixes and cleanups (Bob Moore, Lv
Zheng, Markus Elfring).- ACPI sysfs code updates and a documentation update related to AML
method tracing (Lv Zheng).- ACPI EC driver fix related to serialized evaluations of _Qxx
methods and ACPI tools updates allowing the EC userspace tool to be
built from the kernel source (Lv Zheng).- ACPI processor driver updates preparing it for future introduction
of CPPC support and ACPI PCC mailbox driver updates (Ashwin
Chaugule).- ACPI interrupts enumeration fix for a regression related to the
handling of IRQ attribute conflicts between MADT and the ACPI
namespace (Jiang Liu).- Fixes related to ACPI device PM (Mika Westerberg, Srinidhi
Kasagar).- ACPI device registration code reorganization to separate the
sysfs-related code and bus type operations from the rest (Rafael J
Wysocki).- Assorted cleanups in the ACPI core (Jarkko Nikula, Mathias Krause,
Andy Shevchenko, Rafael J Wysocki, Nicolas Iooss).- ACPI cpufreq driver and ia64 cpufreq driver fixes and cleanups (Pan
Xinhui, Rafael J Wysocki).- cpufreq core cleanups on top of the previous changes allowing it to
preseve its sysfs directories over system suspend/resume (Viresh
Kumar, Rafael J Wysocki, Sebastian Andrzej Siewior).- cpufreq fixes and cleanups related to governors (Viresh Kumar).
- cpufreq updates (core and the cpufreq-dt driver) related to the
turbo/boost mode support (Viresh Kumar, Bartlomiej Zolnierkiewicz).- New DT bindings for Operating Performance Points (OPP), support for
them in the OPP framework and in the cpufreq-dt driver plus related
OPP framework fixes and cleanups (Viresh Kumar).- cpufreq powernv driver updates (Shilpasri G Bhat).
- New cpufreq driver for Mediatek MT8173 (Pi-Cheng Chen).
- Assorted cpufreq driver (speedstep-lib, sfi, integrator) cleanups
and fixes (Abhilash Jindal, Andrzej Hajda, Cristian Ardelean).- intel_pstate driver updates including Skylake-S support, support
for enabling HW P-states per CPU and an additional vendor bypass
list entry (Kristen Carlson Accardi, Chen Yu, Ethan Zhao).- cpuidle core fixes related to the handling of coupled idle states
(Xunlei Pang).- intel_idle driver updates including Skylake Client support and
support for freeze-mode-specific idle states (Len Brown).- Driver core updates related to power management (Andy Shevchenko,
Rafael J Wysocki).- Generic power domains framework fixes and cleanups (Jon Hunter,
Geert Uytterhoeven, Rajendra Nayak, Ulf Hansson).- Device PM QoS framework update to allow the latency tolerance
setting to be exposed to user space via sysfs (Mika Westerberg).- devfreq support for PPMUv2 in Exynos5433 and a fix for an incorrect
exynos-ppmu DT binding (Chanwoo Choi, Javier Martinez Canillas).- System sleep support updates (Alan Stern, Len Brown, SungEun Kim).
- rockchip-io AVS support updates (Heiko Stuebner).
- PM core clocks support fixup (Colin Ian King).
- Power capping RAPL driver update including support for Skylake H/S
and Broadwell-H (Radivoje Jovanovic, Seiichi Ikarashi).- Generic device properties framework fixes related to the handling
of static (driver-provided) property sets (Andy Shevchenko).- turbostat and cpupower updates (Len Brown, Shilpasri G Bhat,
Shreyas B Prabhu)"* tag 'pm+acpi-4.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (180 commits)
cpufreq: speedstep-lib: Use monotonic clock
cpufreq: powernv: Increase the verbosity of OCC console messages
cpufreq: sfi: use kmemdup rather than duplicating its implementation
cpufreq: drop !cpufreq_driver check from cpufreq_parse_governor()
cpufreq: rename cpufreq_real_policy as cpufreq_user_policy
cpufreq: remove redundant 'policy' field from user_policy
cpufreq: remove redundant 'governor' field from user_policy
cpufreq: update user_policy.* on success
cpufreq: use memcpy() to copy policy
cpufreq: remove redundant CPUFREQ_INCOMPATIBLE notifier event
cpufreq: mediatek: Add MT8173 cpufreq driver
dt-bindings: mediatek: Add MT8173 CPU DVFS clock bindings
PM / Domains: Fix typo in description of genpd_dev_pm_detach()
PM / Domains: Remove unusable governor dummies
PM / Domains: Make pm_genpd_init() available to modules
PM / domains: Align column headers and data in pm_genpd_summary output
powercap / RAPL: disable the 2nd power limit properly
tools: cpupower: Fix error when running cpupower monitor
PM / OPP: Drop unlikely before IS_ERR(_OR_NULL)
PM / OPP: Fix static checker warning (broken 64bit big endian systems)
... -
Pull x86 mm updates from Ingo Molnar:
"The dominant change in this cycle was the continued work to isolate
kernel drivers from MTRR legacies: this tree gets rid of all kernel
internal driver interfaces to MTRRs (mostly by rewriting it to proper
PAT interfaces), the only access left is the /proc/mtrr ABI.This work was done by Luis R Rodriguez.
There's also some related PCI interface additions for which I've
Cc:-ed Bjorn"* 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (21 commits)
x86/mm/mtrr: Remove kernel internal MTRR interfaces: unexport mtrr_add() and mtrr_del()
s390/io: Add pci_iomap_wc() and pci_iomap_wc_range()
drivers/dma/iop-adma: Use dma_alloc_writecombine() kernel-style
drivers/video/fbdev/vt8623fb: Use arch_phys_wc_add() and pci_iomap_wc()
drivers/video/fbdev/s3fb: Use arch_phys_wc_add() and pci_iomap_wc()
drivers/video/fbdev/arkfb.c: Use arch_phys_wc_add() and pci_iomap_wc()
PCI: Add pci_iomap_wc() variants
drivers/video/fbdev/gxt4500: Use pci_ioremap_wc_bar() to map framebuffer
drivers/video/fbdev/kyrofb: Use arch_phys_wc_add() and pci_ioremap_wc_bar()
drivers/video/fbdev/i740fb: Use arch_phys_wc_add() and pci_ioremap_wc_bar()
PCI: Add pci_ioremap_wc_bar()
x86/mm: Make kernel/check.c explicitly non-modular
x86/mm/pat: Make mm/pageattr[-test].c explicitly non-modular
x86/mm/pat: Add comments to cachemode translation tables
arch/*/io.h: Add ioremap_uc() to all architectures
drivers/video/fbdev/atyfb: Use arch_phys_wc_add() and ioremap_wc()
drivers/video/fbdev/atyfb: Replace MTRR UC hole with strong UC
drivers/video/fbdev/atyfb: Clarify ioremap() base and length used
drivers/video/fbdev/atyfb: Carve out framebuffer length fudging into a helper
x86/mm, asm-generic: Add IOMMU ioremap_uc() variant default
...
01 Sep, 2015
6 commits
-
* acpi-pm:
ACPI / bus: Move duplicate code to a separate new function
mfd: Add support for Intel Sunrisepoint LPSS devices
dmaengine: add a driver for Intel integrated DMA 64-bit
mfd: make mfd_remove_devices() iterate in reverse order
driver core: implement device_for_each_child_reverse()
klist: implement klist_prev()
Driver core: wakeup the parent device before trying probe
ACPI / PM: Attach ACPI power domain only once
PM / QoS: Make it possible to expose device latency tolerance to userspace
ACPI / PM: Update the copyright notice and description of power.c -
Pull RCU updates from Ingo Molnar:
"The main RCU changes in this cycle are:- the combination of tree geometry-initialization simplifications and
OS-jitter-reduction changes to expedited grace periods. These two
are stacked due to the large number of conflicts that would
otherwise result.- privatize smp_mb__after_unlock_lock().
This commit moves the definition of smp_mb__after_unlock_lock() to
kernel/rcu/tree.h, in recognition of the fact that RCU is the only
thing using this, that nothing else is likely to use it, and that
it is likely to go away completely.- documentation updates.
- torture-test updates.
- misc fixes"
* 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (60 commits)
rcu,locking: Privatize smp_mb__after_unlock_lock()
rcu: Silence lockdep false positive for expedited grace periods
rcu: Don't disable CPU hotplug during OOM notifiers
scripts: Make checkpatch.pl warn on expedited RCU grace periods
rcu: Update MAINTAINERS entry
rcu: Clarify CONFIG_RCU_EQS_DEBUG help text
rcu: Fix backwards RCU_LOCKDEP_WARN() in synchronize_rcu_tasks()
rcu: Rename rcu_lockdep_assert() to RCU_LOCKDEP_WARN()
rcu: Make rcu_is_watching() really notrace
cpu: Wait for RCU grace periods concurrently
rcu: Create a synchronize_rcu_mult()
rcu: Fix obsolete priority-boosting comment
rcu: Use WRITE_ONCE in RCU_INIT_POINTER
rcu: Hide RCU_NOCB_CPU behind RCU_EXPERT
rcu: Add RCU-sched flavors of get-state and cond-sync
rcu: Add fastpath bypassing funnel locking
rcu: Rename RCU_GP_DONE_FQS to RCU_GP_DOING_FQS
rcu: Pull out wait_event*() condition into helper function
documentation: Describe new expedited stall warnings
rcu: Add stall warnings to synchronize_sched_expedited()
... -
Pull crypto updates from Herbert Xu:
"Here is the crypto update for 4.3:API:
- the AEAD interface transition is now complete.
- add top-level skcipher interface.Drivers:
- x86-64 acceleration for chacha20/poly1305.
- add sunxi-ss Allwinner Security System crypto accelerator.
- add RSA algorithm to qat driver.
- add SRIOV support to qat driver.
- add LS1021A support to caam.
- add i.MX6 support to caam"* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (163 commits)
crypto: algif_aead - fix for multiple operations on AF_ALG sockets
crypto: qat - enable legacy VFs
MPI: Fix mpi_read_buffer
crypto: qat - silence a static checker warning
crypto: vmx - Fixing opcode issue
crypto: caam - Use the preferred style for memory allocations
crypto: caam - Propagate the real error code in caam_probe
crypto: caam - Fix the error handling in caam_probe
crypto: caam - fix writing to JQCR_MS when using service interface
crypto: hash - Add AHASH_REQUEST_ON_STACK
crypto: testmgr - Use new skcipher interface
crypto: skcipher - Add top-level skcipher interface
crypto: cmac - allow usage in FIPS mode
crypto: sahara - Use dmam_alloc_coherent
crypto: caam - Add support for LS1021A
crypto: qat - Don't move data inside output buffer
crypto: vmx - Fixing GHASH Key issue on little endian
crypto: vmx - Fixing AES-CTR counter bug
crypto: null - Add missing Kconfig tristate for NULL2
crypto: nx - Add forward declaration for struct crypto_aead
... -
Pull clk updates from Michael Turquette:
"The clk framework changes for 4.3 are mostly updates to existing
drivers and the addition of new clock drivers. Stephen Boyd has also
done a lot of subsystem-wide driver clean-ups (thanks!). There are
also fixes to the framework core and changes to better split clock
provider drivers from clock consumer drivers"* tag 'clk-for-linus-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (227 commits)
clk: s5pv210: add missing call to samsung_clk_of_add_provider()
clk: pistachio: correct critical clock list
clk: pistachio: Fix PLL rate calculation in integer mode
clk: pistachio: Fix override of clk-pll settings from boot loader
clk: pistachio: Fix 32bit integer overflows
clk: tegra: Fix some static checker problems
clk: qcom: Fix MSM8916 prng clock enable bit
clk: Add missing header for 'bool' definition to clk-conf.h
drivers/clk: appropriate __init annotation for const data
clk: rockchip: register pll mux before pll itself
clk: add bindings for the Ux500 clocks
clk/ARM: move Ux500 PRCC bases to the device tree
clk: remove duplicated code with __clk_set_parent_after
clk: Convert __clk_get_name(hw->clk) to clk_hw_get_name(hw)
clk: Constify clk_hw argument to provider APIs
clk: Hi6220: add stub clock driver
dt-bindings: clk: Hi6220: Document stub clock driver
dt-bindings: arm: Hi6220: add doc for SRAM controller
clk: atlas7: fix pll missed divide NR in fraction mode
clk: atlas7: fix bit field and its root clk for coresight_tpiu
... -
To fix build errors:
kernel/built-in.o: In function `bpf_trace_printk':
bpf_trace.c:(.text+0x11a254): undefined reference to `strncpy_from_unsafe'
kernel/built-in.o: In function `fetch_memory_string':
trace_kprobe.c:(.text+0x11acf8): undefined reference to `strncpy_from_unsafe'move strncpy_from_unsafe() next to probe_kernel_read/write()
which use the same memory access style.Reported-by: Fengguang Wu
Reported-by: Guenter Roeck
Fixes: 1a6877b9c0c2 ("lib: introduce strncpy_from_unsafe()")
Signed-off-by: Alexei Starovoitov
Signed-off-by: David S. Miller -
This implements XOR syndrome calculation using NEON intrinsics.
As before, the module can be built for ARM and arm64 from the
same source.Relative performance on a Cortex-A57 based system:
raid6: int64x1 gen() 905 MB/s
raid6: int64x1 xor() 881 MB/s
raid6: int64x2 gen() 1343 MB/s
raid6: int64x2 xor() 1286 MB/s
raid6: int64x4 gen() 1896 MB/s
raid6: int64x4 xor() 1321 MB/s
raid6: int64x8 gen() 1773 MB/s
raid6: int64x8 xor() 1165 MB/s
raid6: neonx1 gen() 1834 MB/s
raid6: neonx1 xor() 1278 MB/s
raid6: neonx2 gen() 2528 MB/s
raid6: neonx2 xor() 1942 MB/s
raid6: neonx4 gen() 2888 MB/s
raid6: neonx4 xor() 2334 MB/s
raid6: neonx8 gen() 2957 MB/s
raid6: neonx8 xor() 2232 MB/s
raid6: using algorithm neonx8 gen() 2957 MB/s
raid6: .... xor() 2232 MB/s, rmw enabledCc: Markus Stockhausen
Cc: Neil Brown
Signed-off-by: Ard Biesheuvel
Signed-off-by: NeilBrown
29 Aug, 2015
1 commit
-
generalize FETCH_FUNC_NAME(memory, string) into
strncpy_from_unsafe() and fix sparse warnings that were
present in original implementation.Signed-off-by: Alexei Starovoitov
Signed-off-by: David S. Miller
28 Aug, 2015
1 commit
-
This should result in a pretty sizeable performance gain for reads. For
rough comparison I did some simple read testing using PMEM to compare
reads of write combining (WC) mappings vs write-back (WB). This was
done on a random lab machine.PMEM reads from a write combining mapping:
# dd of=/dev/null if=/dev/pmem0 bs=4096 count=100000
100000+0 records in
100000+0 records out
409600000 bytes (410 MB) copied, 9.2855 s, 44.1 MB/sPMEM reads from a write-back mapping:
# dd of=/dev/null if=/dev/pmem0 bs=4096 count=1000000
1000000+0 records in
1000000+0 records out
4096000000 bytes (4.1 GB) copied, 3.44034 s, 1.2 GB/sTo be able to safely support a write-back aperture I needed to add
support for the "read flush" _DSM flag, as outlined in the DSM spec:http://pmem.io/documents/NVDIMM_DSM_Interface_Example.pdf
This flag tells the ND BLK driver that it needs to flush the cache lines
associated with the aperture after the aperture is moved but before any
new data is read. This ensures that any stale cache lines from the
previous contents of the aperture will be discarded from the processor
cache, and the new data will be read properly from the DIMM. We know
that the cache lines are clean and will be discarded without any
writeback because either a) the previous aperture operation was a read,
and we never modified the contents of the aperture, or b) the previous
aperture operation was a write and we must have written back the dirtied
contents of the aperture to the DIMM before the I/O was completed.In order to add support for the "read flush" flag I needed to add a
generic routine to invalidate cache lines, mmio_flush_range(). This is
protected by the ARCH_HAS_MMIO_FLUSH Kconfig variable, and is currently
only supported on x86.Signed-off-by: Ross Zwisler
Signed-off-by: Dan Williams
