06 Jul, 2020
11 commits
-
Using a mutex for "print this warning only once" is so overdesigned as
to be actively offensive to my sensitive stomach.Just use "pr_info_once()" that already does this, although in a
(harmlessly) racy manner that can in theory cause the message to be
printed twice if more than one CPU races on that "is this the first
time" test.[ If somebody really cares about that harmless data race (which sounds
very unlikely indeed), that person can trivially fix printk_once() by
using a simple atomic access, preferably with an optimistic non-atomic
test first before even bothering to treat the pointless "make sure it
is _really_ just once" case.A mutex is most definitely never the right primitive to use for
something like this. ]Yes, this is a small and meaningless detail in a code path that hardly
matters. But let's keep some code quality standards here, and not
accept outrageously bad code.Link: https://lore.kernel.org/lkml/CAHk-=wgV9toS7GU3KmNpj8hCS9SeF+A0voHS8F275_mgLhL4Lw@mail.gmail.com/
Cc: Andy Lutomirski
Cc: Thomas Gleixner
Cc: Peter Zijlstra (Intel)
Signed-off-by: Linus Torvalds -
Pull x86 fixes from Thomas Gleixner:
"A series of fixes for x86:- Reset MXCSR in kernel_fpu_begin() to prevent using a stale user
space value.- Prevent writing MSR_TEST_CTRL on CPUs which are not explicitly
whitelisted for split lock detection. Some CPUs which do not
support it crash even when the MSR is written to 0 which is the
default value.- Fix the XEN PV fallout of the entry code rework
- Fix the 32bit fallout of the entry code rework
- Add more selftests to ensure that these entry problems don't come
back.- Disable 16 bit segments on XEN PV. It's not supported because XEN
PV does not implement ESPFIX64"* tag 'x86-urgent-2020-07-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/ldt: Disable 16-bit segments on Xen PV
x86/entry/32: Fix #MC and #DB wiring on x86_32
x86/entry/xen: Route #DB correctly on Xen PV
x86/entry, selftests: Further improve user entry sanity checks
x86/entry/compat: Clear RAX high bits on Xen PV SYSENTER
selftests/x86: Consolidate and fix get/set_eflags() helpers
selftests/x86/syscall_nt: Clear weird flags after each test
selftests/x86/syscall_nt: Add more flag combinations
x86/entry/64/compat: Fix Xen PV SYSENTER frame setup
x86/entry: Move SYSENTER's regs->sp and regs->flags fixups into C
x86/entry: Assert that syscalls are on the right stack
x86/split_lock: Don't write MSR_TEST_CTRL on CPUs that aren't whitelisted
x86/fpu: Reset MXCSR to default in kernel_fpu_begin() -
Pull irq fixes from Thomas Gleixner:
"A set of interrupt chip driver fixes:- Ensure the atomicity of affinity updates in the GIC driver
- Don't try to sleep in atomic context when waiting for the GICv4.1
to respond. Use polling instead.- Typo fixes in Kconfig and warnings"
* tag 'irq-urgent-2020-07-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
irqchip/gic: Atomically update affinity
irqchip/riscv-intc: Fix a typo in a pr_warn()
irqchip/gic-v4.1: Use readx_poll_timeout_atomic() to fix sleep in atomic
irqchip/loongson-pci-msi: Fix a typo in Kconfig -
Pull rcu fixlet from Thomas Gleixner:
"A single fix for a printk format warning in RCU"* tag 'core-urgent-2020-07-05' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
rcuperf: Fix printk format warning -
…/masahiroy/linux-kbuild
Pull Kbuild fixes frin Masahiro Yamada:
- fix various bugs in xconfig
- fix some issues in cross-compilation using Clang
- fix documentation
* tag 'kbuild-fixes-v5.8-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
.gitignore: Do not track `defconfig` from `make savedefconfig`
kbuild: make Clang build userprogs for target architecture
kbuild: fix CONFIG_CC_CAN_LINK(_STATIC) for cross-compilation with Clang
kconfig: qconf: parse newer types at debug info
kconfig: qconf: navigate menus on hyperlinks
kconfig: qconf: don't show goback button on splitMode
kconfig: qconf: simplify the goBack() logic
kconfig: qconf: re-implement setSelected()
kconfig: qconf: make debug links work again
kconfig: qconf: make search fully work again on split mode
kconfig: qconf: cleanup includes
docs: kbuild: fix ReST formatting
gcc-plugins: fix gcc-plugins directory path in documentation -
Pull SCSI fixes from James Bottomley:
"Four small fixes in three drivers.The mptfusion one has actually caused user visible issues in certain
kernel configurations"* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
scsi: mptfusion: Don't use GFP_ATOMIC for larger DMA allocations
scsi: libfc: Skip additional kref updating work event
scsi: libfc: Handling of extra kref
scsi: qla2xxx: Fix a condition in qla2x00_find_all_fabric_devs() -
Pull block fixes from Jens Axboe:
- NVMe fixes from Christoph:
- Fix crash in multi-path disk add (Christoph)
- Fix ignore of identify error (Sagi)- Fix a compiler complaint that a function should be static (Wei)
* tag 'block-5.8-2020-07-05' of git://git.kernel.dk/linux-block:
block: make function __bio_integrity_free() static
nvme: fix a crash in nvme_mpath_add_disk
nvme: fix identify error status silent ignore -
Pull io_uring fix from Jens Axboe:
"Andres reported a regression with the fix that was merged earlier this
week, where his setup of using signals to interrupt io_uring CQ waits
no longer worked correctly.Fix this, and also limit our use of TWA_SIGNAL to the case where we
need it, and continue using TWA_RESUME for task_work as before.Since the original is marked for 5.7 stable, let's flush this one out
early"* tag 'io_uring-5.8-2020-07-05' of git://git.kernel.dk/linux-block:
io_uring: fix regression with always ignoring signals in io_cqring_wait() -
Pull i2c fixes from Wolfram Sang:
"The usual driver fixes and documentation updates"* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
i2c: mlxcpld: check correct size of maximum RECV_LEN packet
i2c: add Kconfig help text for slave mode
i2c: slave-eeprom: update documentation
i2c: eg20t: Load module automatically if ID matches
i2c: designware: platdrv: Set class based on DMI
i2c: algo-pca: Add 0x78 as SCL stuck low status for PCA9665 -
Pull MIPS fixes from Thomas Bogendoerfer:
- fix for missing hazard barrier
- DT fix for ingenic
- DT fix of GPHY names for lantiq
- fix usage of smp_processor_id() while preemption is enabled
* tag 'mips_fixes_5.8_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
MIPS: Do not use smp_processor_id() in preemptible code
MIPS: Add missing EHB in mtc0 -> mfc0 sequence for DSPen
MIPS: ingenic: gcw0: Fix HP detection GPIO.
MIPS: lantiq: xway: sysctrl: fix the GPHY clock alias names
05 Jul, 2020
11 commits
-
Use preempt_disable() to fix the following bug under CONFIG_DEBUG_PREEMPT.
[ 21.915305] BUG: using smp_processor_id() in preemptible [00000000] code: qemu-system-mip/1056
[ 21.923996] caller is do_ri+0x1d4/0x690
[ 21.927921] CPU: 0 PID: 1056 Comm: qemu-system-mip Not tainted 5.8.0-rc2 #3
[ 21.934913] Stack : 0000000000000001 ffffffff81370000 ffffffff8071cd60 a80f926d5ac95694
[ 21.942984] a80f926d5ac95694 0000000000000000 98000007f0043c88 ffffffff80f2fe40
[ 21.951054] 0000000000000000 0000000000000000 0000000000000001 0000000000000000
[ 21.959123] ffffffff802d60cc 98000007f0043dd8 ffffffff81f4b1e8 ffffffff81f60000
[ 21.967192] ffffffff81f60000 ffffffff80fe0000 ffff000000000000 0000000000000000
[ 21.975261] fffffffff500cce1 0000000000000001 0000000000000002 0000000000000000
[ 21.983331] ffffffff80fe1a40 0000000000000006 ffffffff8077f940 0000000000000000
[ 21.991401] ffffffff81460000 98000007f0040000 98000007f0043c80 000000fffba8cf20
[ 21.999471] ffffffff8071cd60 0000000000000000 0000000000000000 0000000000000000
[ 22.007541] 0000000000000000 0000000000000000 ffffffff80212ab4 a80f926d5ac95694
[ 22.015610] ...
[ 22.018086] Call Trace:
[ 22.020562] [] show_stack+0xa4/0x138
[ 22.025732] [] dump_stack+0xf0/0x150
[ 22.030903] [] check_preemption_disabled+0xf4/0x100
[ 22.037375] [] do_ri+0x1d4/0x690
[ 22.042198] [] handle_ri_int+0x44/0x5c
[ 24.359386] BUG: using smp_processor_id() in preemptible [00000000] code: qemu-system-mip/1072
[ 24.368204] caller is do_ri+0x1a8/0x690
[ 24.372169] CPU: 4 PID: 1072 Comm: qemu-system-mip Not tainted 5.8.0-rc2 #3
[ 24.379170] Stack : 0000000000000001 ffffffff81370000 ffffffff8071cd60 a80f926d5ac95694
[ 24.387246] a80f926d5ac95694 0000000000000000 98001007ef06bc88 ffffffff80f2fe40
[ 24.395318] 0000000000000000 0000000000000000 0000000000000001 0000000000000000
[ 24.403389] ffffffff802d60cc 98001007ef06bdd8 ffffffff81f4b818 ffffffff81f60000
[ 24.411461] ffffffff81f60000 ffffffff80fe0000 ffff000000000000 0000000000000000
[ 24.419533] fffffffff500cce1 0000000000000001 0000000000000002 0000000000000000
[ 24.427603] ffffffff80fe0000 0000000000000006 ffffffff8077f940 0000000000000020
[ 24.435673] ffffffff81460020 98001007ef068000 98001007ef06bc80 000000fffbbbb370
[ 24.443745] ffffffff8071cd60 0000000000000000 0000000000000000 0000000000000000
[ 24.451816] 0000000000000000 0000000000000000 ffffffff80212ab4 a80f926d5ac95694
[ 24.459887] ...
[ 24.462367] Call Trace:
[ 24.464846] [] show_stack+0xa4/0x138
[ 24.470029] [] dump_stack+0xf0/0x150
[ 24.475208] [] check_preemption_disabled+0xf4/0x100
[ 24.481682] [] do_ri+0x1a8/0x690
[ 24.486509] [] handle_ri_int+0x44/0x5cSigned-off-by: Xingxing Su
Signed-off-by: Thomas Bogendoerfer -
This resolves the hazard between the mtc0 in the change_c0_status() and
the mfc0 in configure_exception_vector(). Without resolving this hazard
configure_exception_vector() could read an old value and would restore
this old value again. This would revert the changes change_c0_status()
did. I checked this by printing out the read_c0_status() at the end of
per_cpu_trap_init() and the ST0_MX is not set without this patch.The hazard is documented in the MIPS Architecture Reference Manual Vol.
III: MIPS32/microMIPS32 Privileged Resource Architecture (MD00088), rev
6.03 table 8.1 which includes:Producer | Consumer | Hazard
----------|----------|----------------------------
mtc0 | mfc0 | any coprocessor 0 registerI saw this hazard on an Atheros AR9344 rev 2 SoC with a MIPS 74Kc CPU.
There the change_c0_status() function would activate the DSPen by
setting ST0_MX in the c0_status register. This was reverted and then the
system got a DSP exception when the DSP registers were saved in
save_dsp() in the first process switch. The crash looks like this:[ 0.089999] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.097796] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.107070] Kernel panic - not syncing: Unexpected DSP exception
[ 0.113470] Rebooting in 1 seconds..We saw this problem in OpenWrt only on the MIPS 74Kc based Atheros SoCs,
not on the 24Kc based SoCs. We only saw it with kernel 5.4 not with
kernel 4.19, in addition we had to use GCC 8.4 or 9.X, with GCC 8.3 it
did not happen.In the kernel I bisected this problem to commit 9012d011660e ("compiler:
allow all arches to enable CONFIG_OPTIMIZE_INLINING"), but when this was
reverted it also happened after commit 172dcd935c34b ("MIPS: Always
allocate exception vector for MIPSr2+").Commit 0b24cae4d535 ("MIPS: Add missing EHB in mtc0 -> mfc0 sequence.")
does similar changes to a different file. I am not sure if there are
more places affected by this problem.Signed-off-by: Hauke Mehrtens
Cc:
Signed-off-by: Thomas Bogendoerfer -
Running `make savedefconfig` creates by default `defconfig`, which is,
currently, on git’s radar, for example, `git status` lists this file as
untracked.So, add the file to `.gitignore`, so it’s ignored by git.
Signed-off-by: Paul Menzel
Acked-by: Greg Kroah-Hartman
Signed-off-by: Masahiro Yamada -
Pull powerpc fixes from Michael Ellerman:
"One fix for a regression in our pkey handling, which exhibits as
PROT_EXEC mappings taking continuous page faults.Thanks to: Jan Stancek, Aneesh Kumar K.V"
* tag 'powerpc-5.8-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
powerpc/mm/pkeys: Make pkey access check work on execute_only_key -
Pull arm64 fixes from Will Deacon:
"Nothing earth-shattering, really - some CPU errata workarounds (one
day they'll get it right, ha!) and a fix for a boot failure with very
large kernel images where the alternative patching gets confused when
patching relative branches using veneers.- Fix alternative patching for very large kernel images and modules
- Hook up existing CPU errata workarounds for Qualcomm Kryo CPUs"
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
arm64: Add KRYO4XX silver CPU cores to erratum list 1530923 and 1024718
arm64: Add KRYO4XX gold CPU cores to erratum list 1463225 and 1418040
arm64: Add MIDR value for KRYO4XX gold CPU cores
arm64/alternatives: use subsections for replacement sequences -
When switching to TWA_SIGNAL for task_work notifications, we also made
any signal based condition in io_cqring_wait() return -ERESTARTSYS.
This breaks applications that rely on using signals to abort someone
waiting for events.Check if we have a signal pending because of queued task_work, and
repeat the signal check once we've run the task_work. This provides a
reliable way of telling the two apart.Additionally, only use TWA_SIGNAL if we are using an eventfd. If not,
we don't have the dependency situation described in the original commit,
and we can get by with just using TWA_RESUME like we previously did.Fixes: ce593a6c480a ("io_uring: use signal based task_work running")
Cc: stable@vger.kernel.org # v5.7
Reported-by: Andres Freund
Tested-by: Andres Freund
Signed-off-by: Jens Axboe -
Xen PV doesn't implement ESPFIX64, so they don't work right. Disable
them. Also print a warning the first time anyone tries to use a
16-bit segment on a Xen PV guest that would otherwise allow it
to help people diagnose this change in behavior.This gets us closer to having all x86 selftests pass on Xen PV.
Signed-off-by: Andy Lutomirski
Signed-off-by: Thomas Gleixner
Acked-by: Peter Zijlstra (Intel)
Link: https://lkml.kernel.org/r/92b2975459dfe5929ecf34c3896ad920bd9e3f2d.1593795633.git.luto@kernel.org -
DEFINE_IDTENTRY_MCE and DEFINE_IDTENTRY_DEBUG were wired up as non-RAW
on x86_32, but the code expected them to be RAW.Get rid of all the macro indirection for them on 32-bit and just use
DECLARE_IDTENTRY_RAW and DEFINE_IDTENTRY_RAW directly.Also add a warning to make sure that we only hit the _kernel paths
in kernel mode.Reported-by: Naresh Kamboju
Signed-off-by: Andy Lutomirski
Signed-off-by: Thomas Gleixner
Acked-by: Peter Zijlstra (Intel)
Link: https://lkml.kernel.org/r/9e90a7ee8e72fd757db6d92e1e5ff16339c1ecf9.1593795633.git.luto@kernel.org -
On Xen PV, #DB doesn't use IST. It still needs to be correctly routed
depending on whether it came from user or kernel mode.Get rid of DECLARE/DEFINE_IDTENTRY_XEN -- it was too hard to follow the
logic. Instead, route #DB and NMI through DECLARE/DEFINE_IDTENTRY_RAW on
Xen, and do the right thing for #DB. Also add more warnings to the
exc_debug* handlers to make this type of failure more obvious.This fixes various forms of corruption that happen when usermode
triggers #DB on Xen PV.Fixes: 4c0dcd8350a0 ("x86/entry: Implement user mode C entry points for #DB and #MCE")
Signed-off-by: Andy Lutomirski
Signed-off-by: Thomas Gleixner
Acked-by: Peter Zijlstra (Intel)
Link: https://lkml.kernel.org/r/4163e733cce0b41658e252c6c6b3464f33fdff17.1593795633.git.luto@kernel.org -
Chasing down a Xen bug caused me to realize that the new entry sanity
checks are still fairly weak. Add some more checks.Signed-off-by: Andy Lutomirski
Signed-off-by: Thomas Gleixner
Acked-by: Peter Zijlstra (Intel)
Link: https://lkml.kernel.org/r/881de09e786ab93ce56ee4a2437ba2c308afe7a9.1593795633.git.luto@kernel.org -
Move the clearing of the high bits of RAX after Xen PV joins the SYSENTER
path so that Xen PV doesn't skip it.Arguably this code should be deleted instead, but that would belong in the
merge window.Fixes: ffae641f5747 ("x86/entry/64/compat: Fix Xen PV SYSENTER frame setup")
Signed-off-by: Andy Lutomirski
Signed-off-by: Thomas Gleixner
Acked-by: Peter Zijlstra (Intel)
Link: https://lkml.kernel.org/r/9d33b3f3216dcab008070f1c28b6091ae7199969.1593795633.git.luto@kernel.org
04 Jul, 2020
18 commits
-
Pull xen fixes from Juergen Gross:
"One small cleanup patch for ARM and two patches for the xenbus driver
fixing latent problems (large stack allocations and bad return code
settings)"* tag 'for-linus-5.8b-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen/xenbus: let xenbus_map_ring_valloc() return errno values only
xen/xenbus: avoid large structs and arrays on the stack
arm/xen: remove the unused macro GRANT_TABLE_PHYSADDR -
I2C_SMBUS_BLOCK_MAX defines already the maximum number as defined in the
SMBus 2.0 specs. I don't see a reason to add 1 here. Also, fix the errno
to what is suggested for this error.Fixes: c9bfdc7c16cb ("i2c: mlxcpld: Add support for smbus block read transaction")
Signed-off-by: Wolfram Sang
Reviewed-by: Michael Shych
Tested-by: Michael Shych
Signed-off-by: Wolfram Sang -
Pull sysctl fix from Al Viro:
"Another regression fix for sysctl changes this cycle..."* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
Call sysctl_head_finish on error -
I can't recall why there was none, but we surely want to have it.
Signed-off-by: Wolfram Sang
Reviewed-by: Niklas Söderlund
Reviewed-by: Geert Uytterhoeven
Signed-off-by: Wolfram Sang -
Add more details which have either been missing ever since or describe
recent additions.Signed-off-by: Wolfram Sang
Reviewed-by: Niklas Söderlund
Reviewed-by: Luca Ceresoli
Signed-off-by: Wolfram Sang -
The driver can't be loaded automatically because it misses
module alias to be provided. Add corresponding MODULE_DEVICE_TABLE()
call to the driver.Signed-off-by: Andy Shevchenko
Signed-off-by: Wolfram Sang -
Current AMD's zen-based APUs use this core for some of its i2c-buses.
With this patch we re-enable autodetection of hwmon-alike devices, so
lm-sensors will be able to work automatically.It does not affect the boot-time of embedded devices, as the class is
set based on the DMI information.DMI is probed only on Qtechnology QT5222 Industrial Camera Platform.
DocLink: https://qtec.com/camera-technology-camera-platforms/
Fixes: 3eddad96c439 ("i2c: designware: reverts "i2c: designware: Add support for AMD I2C controller"")
Signed-off-by: Ricardo Ribalda
Reviewed-by: Andy Shevchenko
Acked-by: Jarkko Nikula
Signed-off-by: Wolfram Sang -
The PCA9665 datasheet says that I2CSTA = 78h indicates that SCL is stuck
low, this differs to the PCA9564 which uses 90h for this indication.
Treat either 0x78 or 0x90 as an indication that the SCL line is stuck.Based on looking through the PCA9564 and PCA9665 datasheets this should
be safe for both chips. The PCA9564 should not return 0x78 for any valid
state and the PCA9665 should not return 0x90.Fixes: eff9ec95efaa ("i2c-algo-pca: Add PCA9665 support")
Signed-off-by: Chris Packham
Reviewed-by: Andy Shevchenko
Signed-off-by: Wolfram Sang -
Pull cifs fixes from Steve French:
"Eight cifs/smb3 fixes, most when specifying the multiuser mount flag.Five of the fixes are for stable"
* tag '5.8-rc3-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6:
cifs: prevent truncation from long to int in wait_for_free_credits
cifs: Fix the target file was deleted when rename failed.
SMB3: Honor 'posix' flag for multiuser mounts
SMB3: Honor 'handletimeout' flag for multiuser mounts
SMB3: Honor lease disabling for multiuser mounts
SMB3: Honor persistent/resilient handle flags for multiuser mounts
SMB3: Honor 'seal' flag for multiuser mounts
cifs: Display local UID details for SMB sessions in DebugData -
Pull hwmon fixes from Guenter Roeck:
- Fix typo in Kconfig SENSORS_IR35221 option
- Fix potential memory leak in acpi_power_meter_add()
- Make sure the OVERT mask is set correctly in max6697 driver
- In PMBus core, fix page vs. register when accessing fans
- Mark is_visible functions static in bt1-pvt driver
- Define Temp- and Volt-to-N poly as maybe-unused in bt1-pvt driver
* tag 'hwmon-for-v5.8-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
hwmon: (pmbus) fix a typo in Kconfig SENSORS_IR35221 option
hwmon: (acpi_power_meter) Fix potential memory leak in acpi_power_meter_add()
hwmon: (max6697) Make sure the OVERT mask is set correctly
hwmon: (pmbus) Fix page vs. register when accessing fans
hwmon: (bt1-pvt) Mark is_visible functions static
hwmon: (bt1-pvt) Define Temp- and Volt-to-N poly as maybe-unused -
Merge misc fixes from Andrew Morton:
"Subsystems affected by this patch series: mm/hugetlb, samples, mm/cma,
mm/vmalloc, mm/pagealloc"* emailed patches from Andrew Morton :
mm/page_alloc: fix documentation error
vmalloc: fix the owner argument for the new __vmalloc_node_range callers
mm/cma.c: use exact_nid true to fix possible per-numa cma leak
samples/vfs: avoid warning in statx override
mm/hugetlb.c: fix pages per hugetlb calculation -
When I increased the upper bound of the min_free_kbytes value in
ee8eb9a5fe863 ("mm/page_alloc: increase default min_free_kbytes bound") I
forgot to tweak the above comment to reflect the new value. This patch
fixes that mistake.Signed-off-by: Joel Savitz
Signed-off-by: Andrew Morton
Cc: Matthew Wilcox
Cc: Rafael Aquini
Cc: Fabrizio D'Angelo
Link: http://lkml.kernel.org/r/20200624221236.29560-1-jsavitz@redhat.com
Signed-off-by: Linus Torvalds -
Fix the recently added new __vmalloc_node_range callers to pass the
correct values as the owner for display in /proc/vmallocinfo.Fixes: 800e26b81311 ("x86/hyperv: allocate the hypercall page with only read and execute bits")
Fixes: 10d5e97c1bf8 ("arm64: use PAGE_KERNEL_ROX directly in alloc_insn_page")
Fixes: 7a0e27b2a0ce ("mm: remove vmalloc_exec")
Reported-by: Ard Biesheuvel
Signed-off-by: Christoph Hellwig
Signed-off-by: Andrew Morton
Link: http://lkml.kernel.org/r/20200627075649.2455097-1-hch@lst.de
Signed-off-by: Linus Torvalds -
Calling cma_declare_contiguous_nid() with false exact_nid for per-numa
reservation can easily cause cma leak and various confusion. For example,
mm/hugetlb.c is trying to reserve per-numa cma for gigantic pages. But it
can easily leak cma and make users confused when system has memoryless
nodes.In case the system has 4 numa nodes, and only numa node0 has memory. if
we set hugetlb_cma=4G in bootargs, mm/hugetlb.c will get 4 cma areas for 4
different numa nodes. since exact_nid=false in current code, all 4 numa
nodes will get cma successfully from node0, but hugetlb_cma[1 to 3] will
never be available to hugepage will only allocate memory from
hugetlb_cma[0].In case the system has 4 numa nodes, both numa node0&2 has memory, other
nodes have no memory. if we set hugetlb_cma=4G in bootargs, mm/hugetlb.c
will get 4 cma areas for 4 different numa nodes. since exact_nid=false in
current code, all 4 numa nodes will get cma successfully from node0 or 2,
but hugetlb_cma[1] and [3] will never be available to hugepage as
mm/hugetlb.c will only allocate memory from hugetlb_cma[0] and
hugetlb_cma[2]. This causes permanent leak of the cma areas which are
supposed to be used by memoryless node.Of cource we can workaround the issue by letting mm/hugetlb.c scan all cma
areas in alloc_gigantic_page() even node_mask includes node0 only. that
means when node_mask includes node0 only, we can get page from
hugetlb_cma[1] to hugetlb_cma[3]. But this will cause kernel crash in
free_gigantic_page() while it wants to free page by:
cma_release(hugetlb_cma[page_to_nid(page)], page, 1 << order)On the other hand, exact_nid=false won't consider numa distance, it might
be not that useful to leverage cma areas on remote nodes. I feel it is
much simpler to make exact_nid true to make everything clear. After that,
memoryless nodes won't be able to reserve per-numa CMA from other nodes
which have memory.Fixes: cf11e85fc08c ("mm: hugetlb: optionally allocate gigantic hugepages using cma")
Signed-off-by: Barry Song
Signed-off-by: Andrew Morton
Acked-by: Roman Gushchin
Cc: Jonathan Cameron
Cc: Aslan Bakirov
Cc: Michal Hocko
Cc: Andreas Schaufler
Cc: Mike Kravetz
Cc: Rik van Riel
Cc: Joonsoo Kim
Cc: Robin Murphy
Cc:
Link: http://lkml.kernel.org/r/20200628074345.27228-1-song.bao.hua@hisilicon.com
Signed-off-by: Linus Torvalds -
Something changed recently to uncover this warning:
samples/vfs/test-statx.c:24:15: warning: `struct foo' declared inside parameter list will not be visible outside of this definition or declaration
24 | #define statx foo
| ^~~Which is due the use of "struct statx" (here, "struct foo") in a function
prototype argument list before it has been defined:int
# 56 "/usr/include/x86_64-linux-gnu/bits/statx-generic.h"
foo
# 56 "/usr/include/x86_64-linux-gnu/bits/statx-generic.h" 3 4
(int __dirfd, const char *__restrict __path, int __flags,
unsigned int __mask, struct
# 57 "/usr/include/x86_64-linux-gnu/bits/statx-generic.h"
foo
# 57 "/usr/include/x86_64-linux-gnu/bits/statx-generic.h" 3 4
*__restrict __buf)
__attribute__ ((__nothrow__ , __leaf__)) __attribute__ ((__nonnull__ (2, 5)));Add explicit struct before #include to avoid warning.
Fixes: f1b5618e013a ("vfs: Add a sample program for the new mount API")
Signed-off-by: Kees Cook
Signed-off-by: Andrew Morton
Cc: Miklos Szeredi
Cc: Al Viro
Cc: David Howells
Link: http://lkml.kernel.org/r/202006282213.C516EA6@keescook
Signed-off-by: Linus Torvalds -
The routine hpage_nr_pages() was incorrectly used to calculate the number
of base pages in a hugetlb page. hpage_nr_pages is designed to be called
for THP pages and will return HPAGE_PMD_NR for hugetlb pages of any size.Due to the context in which hpage_nr_pages was called, it is unlikely to
produce a user visible error. The routine with the incorrect call is only
exercised in the case of hugetlb memory error or migration. In addition,
this would need to be on an architecture which supports huge page sizes
less than PMD_SIZE. And, the vma containing the huge page would also need
to smaller than PMD_SIZE.Fixes: c0d0381ade79 ("hugetlbfs: use i_mmap_rwsem for more pmd sharing synchronization")
Reported-by: Matthew Wilcox (Oracle)
Signed-off-by: Mike Kravetz
Signed-off-by: Andrew Morton
Reviewed-by: Matthew Wilcox (Oracle)
Cc: Michal Hocko
Cc: "Kirill A . Shutemov"
Cc:
Link: http://lkml.kernel.org/r/20200629185003.97202-1-mike.kravetz@oracle.com
Signed-off-by: Linus Torvalds -
Pull xfs fix from Darrick Wong:
"Fix a use-after-free bug when the fs shuts down"* tag 'xfs-5.8-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
xfs: fix use-after-free on CIL context on shutdown -
Pull PCI fix from Bjorn Helgaas:
"Fix a pcie_find_root_port() simplification that broke power management
because it didn't handle the edge case of finding the Root Port of a
Root Port itself (Mika Westerberg)""* tag 'pci-v5.8-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
PCI: Make pcie_find_root_port() work for Root Ports
