29 Oct, 2017
1 commit
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…t/masahiroy/linux-kbuild
Pull Kbuild fixes from Masahiro Yamada:
- fix O= building on dash
- remove unused dependency in Makefile
- fix default of a choice in Kconfig
- fix typos and documentation style
- fix command options unrecognized by sparse
* tag 'kbuild-fixes-v4.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
kbuild: clang: fix build failures with sparse check
kbuild doc: a bundle of fixes on makefiles.txt
Makefile: kselftest: fix grammar typo
kbuild: Fix optimization level choice default
kbuild: drop unused symverfile in Makefile.modpost
kbuild: revert $(realpath ...) to $(shell cd ... && /bin/pwd)
23 Oct, 2017
2 commits
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Pull input fix from Dmitry Torokhov:
"A fix for a broken commit in the previous pull breaking automatic
module loading of input handlers, such ad evdev"* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
Input: do not use property bits when generating module alias -
The commit 8724ecb07229 ("Input: allow matching device IDs on property
bits") started using property bits when generating module aliases for input
handlers, but did not adjust the generation of MODALIAS attribute on input
device uevents, breaking automatic module loading. Given that no handler
currently uses property bits in their module tables, let's revert this part
of the commit for now.Reported-by: Damien Wyart
Tested-by: Damien Wyart
Fixes: 8724ecb07229 ("Input: allow matching device IDs on property bits")
Signed-off-by: Dmitry Torokhov
22 Oct, 2017
1 commit
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Pull input fixes from Dmitry Torokhov:
- joydev now implements a blacklist to avoid creating joystick nodes
for accelerometers found in composite devices such as PlaStation
controllers- assorted driver fixes
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
Input: ims-psu - check if CDC union descriptor is sane
Input: joydev - blacklist ds3/ds4/udraw motion sensors
Input: allow matching device IDs on property bits
Input: factor out and export input_device_id matching code
Input: goodix - poll the 'buffer status' bit before reading data
Input: axp20x-pek - fix module not auto-loading for axp221 pek
Input: tca8418 - enable interrupt after it has been requested
Input: stmfts - fix setting ABS_MT_POSITION_* maximum size
Input: ti_am335x_tsc - fix incorrect step config for 5 wire touchscreen
Input: synaptics - disable kernel tracking on SMBus devices
20 Oct, 2017
1 commit
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Let's allow matching input devices on their property bits, both in-kernel
and when generating module aliases.Tested-by: Roderick Colenbrander
Signed-off-by: Dmitry Torokhov
14 Oct, 2017
1 commit
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gcc on aarch64 may emit synbols of type 'n' if the kernel is built with
'-frecord-gcc-switches'. In most cases, those symbols are reported with
nm as000000000000000e n $d
and with objdump as
0000000000000000 l d .GCC.command.line 0000000000000000 .GCC.command.line
000000000000000e l .GCC.command.line 0000000000000000 $dThose symbols are detected in is_arm_mapping_symbol() and ignored.
However, if "--prefix-symbols=" is configured as well, the
situation is different. For example, in efi/libstub, arm64 images are
built with'--prefix-alloc-sections=.init --prefix-symbols=__efistub_'.
In combination with '-frecord-gcc-switches', the symbols are now reported
by nm as:000000000000000e n __efistub_$d
and by objdump as:
0000000000000000 l d .GCC.command.line 0000000000000000 .GCC.command.line
000000000000000e l .GCC.command.line 0000000000000000 __efistub_$dThose symbols are no longer ignored and included in the base address
calculation. This results in a base address of 000000000000000e, which
in turn causes kallsyms to abort withkallsyms failure:
relative symbol value 0xffffff900800a000 out of range in relative modeThe problem is seen in little endian arm64 builds with CONFIG_EFI
enabled and with '-frecord-gcc-switches' set in KCFLAGS.Explicitly ignore symbols of type 'n' since those are clearly debug
symbols.Link: http://lkml.kernel.org/r/1507136063-3139-1-git-send-email-linux@roeck-us.net
Signed-off-by: Guenter Roeck
Acked-by: Ard Biesheuvel
Cc: Josh Poimboeuf
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
13 Oct, 2017
1 commit
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If faddr2line is given a function name which is the last one listed by
"nm -n", it will fail because it never finds the next symbol.So teach the awk script to catch that possibility, and use 'size' to
provide the end point of the last function.Signed-off-by: NeilBrown
Signed-off-by: Linus Torvalds
07 Oct, 2017
1 commit
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Since commit 040fcc819a2e ("kbuild: improved modversioning
support for external modules"), symverfile has been replaced
with kernelsymfile and modulesymfile.Signed-off-by: Cao jin
Signed-off-by: Masahiro Yamada
04 Oct, 2017
2 commits
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Currently running checkpatch on a directory with a cover-letter.patch
file reports the following error:-----------------------------------------
patches/smp-v2/v2-0000-cover-letter.patch
-----------------------------------------ERROR: Does not appear to be a unified-diff format patch
The logic to suppress the unified-diff check for cover letters is there
but is checking $file instead of $filename. Fix the variable to use the
correct one.Link: http://lkml.kernel.org/r/20170909090406.31523-1-shorne@gmail.com
Signed-off-by: Stafford Horne
Acked-by: Joe Perches
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Here are some of the more spelling mistakes and typos that I've found
while fixing up spelling mistakes in kernel error message text over the
past eight weeks.[akpm@linux-foundation.org: s/|/||/, per Joe]
Link: http://lkml.kernel.org/r/20170919090818.5989-1-colin.king@canonical.com
Signed-off-by: Colin Ian King
Acked-by: Kees Cook
Cc: Masahiro Yamada
Cc: Stephen Boyd
Cc: Joe Perches
Cc: Ross Zwisler
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
28 Sep, 2017
1 commit
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The kbuild bot occasionally reports warnings like:
drivers/scsi/pcmcia/aha152x_core.o: warning: objtool: seldo_run()+0x130: unreachable instruction
These warnings are always with GCC 4.4. That version of GCC sometimes
places unreachable instructions after calls to noreturn functions.The unreachable warnings aren't very important anyway. Just ignore them
for old versions of GCC.Reported-by: kbuild test robot
Signed-off-by: Josh Poimboeuf
Cc: Linus Torvalds
Cc: Peter Zijlstra
Cc: Thomas Gleixner
Link: http://lkml.kernel.org/r/bc89b807d965b98ec18a0bb94f96a594bd58f2f2.1506551639.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar
25 Sep, 2017
1 commit
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Pull DeviceTree fixes from Rob Herring:
- fix build for !OF providing empty of_find_device_by_node
- fix Abracon vendor prefix
- sync dtx_diff include paths (again)
- a stm32h7 clock binding doc fix
* tag 'devicetree-fixes-for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
dt-bindings: clk: stm32h7: fix clock-cell size
scripts/dtc: dtx_diff - 2nd update of include dts paths to match build
dt-bindings: fix vendor prefix for Abracon
of: provide inline helper for of_find_device_by_node
20 Sep, 2017
4 commits
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Update dtx_diff include paths in the same manner as:
commit b12869a8d519 ("of: remove drivers/of/testcase-data from
include search path for CPP"), commit 5ffa2aed389c ("of: remove
arch/$(SRCARCH)/boot/dts from include search path for CPP"), and
commit 50f9ddaf64e1 ("of: search scripts/dtc/include-prefixes path
for both CPP and DTC").Remove proposed include path kernel/dts/, which was never implemented
for the dtb build.For the diff case, each source file is compiled separately. For
each of those compiles, provide the location of the source file
as an include path, not the location of both source files.Signed-off-by: Frank Rowand
Signed-off-by: Rob Herring -
The "Release:" field of the spec file is determined based on the
.version file.However, the .version file is not copied to the source tar file.
So, when we build the kernel from the source package, the UTS_VERSION
always indicates #1. This does not match with "rpm -q".The kernel UTS_VERSION and "rpm -q" do not agree for binrpm-pkg, either.
Please note the kernel has already been built before the spec file is
created. Currently, mkspec invokes mkversion. This script returns an
incremented version. So, the "Release:" field of the spec file is
greater than the version in the kernel by one.For the source package build (where .version file is missing), we can
give KBUILD_BUILD_VERSION=%{release} to the build command.For the binary package build, we can simply read out the .version file
because it contains the version number that was used for building the
kernel image.We can remove scripts/mkversion because scripts/package/Makefile need
not touch the .version file.Signed-off-by: Masahiro Yamada
-
Commit 5620a0d1aacd ("firmware: delete in-kernel firmware") deleted
in-kernel firmware support, including the firmware install command.So, the firmware package does not make sense any more. Remove it.
Signed-off-by: Masahiro Yamada
Reviewed-by: Riku Voipio
Acked-by: Greg Kroah-Hartman -
Commit 5620a0d1aacd ("firmware: delete in-kernel firmware") deleted
in-kernel firmware support, including "make firmware_install".Since then, "make rpm-pkg" / "make binrpm-pkg" fails to build with
the error:make[2]: *** No rule to make target `firmware_install'. Stop.
Commit df85b2d767aa ("firmware: Restore support for built-in firmware")
restored the build infrastructure for CONFIG_EXTRA_FIRMWARE, but this
is out of the scope of "make firmware_install". So, the right thing to
do is to kill the use of "make firmware_install".Fixes: 5620a0d1aacd ("firmware: delete in-kernel firmware")
Signed-off-by: Masahiro Yamada
Acked-by: Greg Kroah-Hartman
16 Sep, 2017
1 commit
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…el/git/gregkh/driver-core
Pull firmware removal from Greg KH:
"Many many years ago (at the kernel summit in Boston), we all came to
the agreement that the firmware/ tree should be dropped from the
kernel, and everyone use the linux-firmware package instead. For some
minor reason, David Woodhouse didn't send the pull request at that
point in time, and everyone forgot about this.The topic came up in the hallway track at the Plumbers conference this
week, so here's a single patch that drops the whole firmware tree. The
last firmware update was back in 2013, and all distros have been using
linux-firmware instead since at least that year, if not before. The
only commits to that directory since 2013 was some kbuild fixups for
various build tool issues.So lets finally drop this, we don't need to lug them around in the
kernel source tree anymore, especially as no one wants or uses them.This has passed build testing with 0-day, I don't think it made it
into linux-next this week, but I figured it was good to get in before
4.14-rc1 was out"* tag 'firmware_removal-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
firmware: delete in-kernel firmware
15 Sep, 2017
2 commits
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The last firmware change for the in-kernel firmware source code was back
in 2013. Everyone has been relying on the out-of-tree linux-firmware
package for a long long time.So let's drop it, it's baggage we don't need to keep dragging around
(and having to fix random kbuild issues over time...)Cc: Kyle McMartin
Cc: Andrew Morton
Cc: Michal Marek
Cc: Masahiro Yamada
Acked-by: David Woodhouse
Signed-off-by: Greg Kroah-Hartman -
Pull Kbuild updates from Masahiro Yamada:
- Use Make-builtin $(abspath ...) helper to get absolute path
- Add W=2 extra warning option to detect unused macros
- Use more KCONFIG_CONFIG instead hard-coded .config
- Fix bugs of tar*-pkg targets
* tag 'kbuild-v4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
kbuild: buildtar: do not print successful message if tar returns error
kbuild: buildtar: fix tar error when CONFIG_MODULES is disabled
kbuild: Use KCONFIG_CONFIG in buildtar
Kbuild: enable -Wunused-macros warning for "make W=2"
kbuild: use $(abspath ...) instead of $(shell cd ... && /bin/pwd)
14 Sep, 2017
2 commits
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Pull modules updates from Jessica Yu:
"Summary of modules changes for the 4.14 merge window:- minor code cleanups and fixes
- modpost: avoid building modules that have names that exceed the
size of the name field in struct module"* tag 'modules-for-v4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux:
module: Remove const attribute from alias for MODULE_DEVICE_TABLE
module: fix ddebug_remove_module()
modpost: abort if module name is too long -
Pull documentation fixes from Jonathan Corbet:
"A cleanup from Mauro that needed to wait for the media pull, plus a
handful of other fixes that wandered in"* tag 'docs-4.14' of git://git.lwn.net/linux:
kokr/memory-barriers.txt: Apply atomic_t.txt change
kokr/doc: Update memory-barriers.txt for read-to-write dependencies
docs-rst: don't require adjustbox anymore
docs-rst: conf.py: only setup notice box colors if Sphinx < 1.6
docs-rst: conf.py: remove lscape from LaTeX preamble
13 Sep, 2017
1 commit
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Pull selinux updates from Paul Moore:
"A relatively quiet period for SELinux, 11 patches with only two/three
having any substantive changes.These noteworthy changes include another tweak to the NNP/nosuid
handling, per-file labeling for cgroups, and an object class fix for
AF_UNIX/SOCK_RAW sockets; the rest of the changes are minor tweaks or
administrative updates (Stephen's email update explains the file
explosion in the diffstat).Everything passes the selinux-testsuite"
[ Also a couple of small patches from the security tree from Tetsuo
Handa for Tomoyo and LSM cleanup. The separation of security policy
updates wasn't all that clean - Linus ]* tag 'selinux-pr-20170831' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux:
selinux: constify nf_hook_ops
selinux: allow per-file labeling for cgroupfs
lsm_audit: update my email address
selinux: update my email address
MAINTAINERS: update the NetLabel and Labeled Networking information
selinux: use GFP_NOWAIT in the AVC kmem_caches
selinux: Generalize support for NNP/nosuid SELinux domain transitions
selinux: genheaders should fail if too many permissions are defined
selinux: update the selinux info in MAINTAINERS
credits: update Paul Moore's info
selinux: Assign proper class to PF_UNIX/SOCK_RAW sockets
tomoyo: Update URLs in Documentation/admin-guide/LSM/tomoyo.rst
LSM: Remove security_task_create() hook.
12 Sep, 2017
2 commits
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The previous commit spotted that "Tarball successfully created ..."
is displayed even if the "tar" command returns error code because
it is followed by "| ${compress}".Let the build fail instead of printing the successful message since
if the "tar" command fails, the output may not be what users expect.Avoid the use of the pipe. While we are here, refactor the script
removing the use of sub-shell, ${compress}, ${file_ext}.Signed-off-by: Masahiro Yamada
-
$tmpdir/lib is created by "make modules_install". It does not exist
if CONFIG_MODULES is disabled, then tar reports the following messages:tar: lib: Cannot stat: No such file or directory
tar: Exiting with failure status due to previous errorsSigned-off-by: Masahiro Yamada
10 Sep, 2017
2 commits
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Merge more updates from Andrew Morton:
- most of the rest of MM
- a small number of misc things
- lib/ updates
- checkpatch
- autofs updates
- ipc/ updates
* emailed patches from Andrew Morton : (126 commits)
ipc: optimize semget/shmget/msgget for lots of keys
ipc/sem: play nicer with large nsops allocations
ipc/sem: drop sem_checkid helper
ipc: convert kern_ipc_perm.refcount from atomic_t to refcount_t
ipc: convert sem_undo_list.refcnt from atomic_t to refcount_t
ipc: convert ipc_namespace.count from atomic_t to refcount_t
kcov: support compat processes
sh: defconfig: cleanup from old Kconfig options
mn10300: defconfig: cleanup from old Kconfig options
m32r: defconfig: cleanup from old Kconfig options
drivers/pps: use surrounding "if PPS" to remove numerous dependency checks
drivers/pps: aesthetic tweaks to PPS-related content
cpumask: make cpumask_next() out-of-line
kmod: move #ifdef CONFIG_MODULES wrapper to Makefile
kmod: split off umh headers into its own file
MAINTAINERS: clarify kmod is just a kernel module loader
kmod: split out umh code into its own file
test_kmod: flip INT checks to be consistent
test_kmod: remove paranoid UINT_MAX check on uint range processing
vfat: deduplicate hex2bin()
... -
I removed all the gperf use, but not the Makefile rules. Sam Ravnborg
says I get bonus points for cleaning this up. I'll hold him to it.Requested-by: Sam Ravnborg
Signed-off-by: Linus Torvalds
09 Sep, 2017
6 commits
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Unlike all other types, LONG_LINE, LONG_LINE_COMMENT and LONG_LINE_STRING
are passed to WARN() through a variable. This causes the parser in
list_types() to miss them and consequently they are not present in the
output of --list-types.Additionally, types TYPO_SPELLING, FSF_MAILING_ADDRESS and AVOID_BUG are
passed with a variable level, causing the parser to miss them too.So modify the regex to also catch these special cases.
Link: http://lkml.kernel.org/r/20170902175610.7e4a7c9d@endymion
Fixes: 3beb42eced39 ("checkpatch: add --list-types to show message types to show or ignore")
Signed-off-by: Jean Delvare
Acked-by: Joe Perches
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The variable name "$msg_type" is sometimes used to set the message type,
and sometimes used to set the message level. This works but is kind of
confusing. Use "$msg_level" in the latter case instead, to make the code
clearer.Link: http://lkml.kernel.org/r/20170902175345.175db33a@endymion
Signed-off-by: Jean Delvare
Acked-by: Joe Perches
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Link: http://lkml.kernel.org/r/20170902175249.15bb77f2@endymion
Signed-off-by: Jean Delvare
Acked-by: Joe Perches
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
An if statement test like
if ((foo == bar) && (baz != qux))
can arguably be better written without the parentheses as
if (foo == bar && baz != qux)Add a test to find these cases.
Link: http://lkml.kernel.org/r/dcd0561ddd0fa43c51a420d53b550d738bf42001.1502734458.git.joe@perches.com
Signed-off-by: Joe Perches
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
I had stupidly missed one special use of 'is_reserved_word()' when I
converted the code to avoid gperf.I had changed that function to return the token ID directly rather than
a pointer to the token descriptor structure, but that meant that the
test for "is this a reserved word" changed from checking the return
value against NULL, to checking that it wasn't negative.And while I had converted the main token parser over, I missed the
special case of the typeof phrase handling. And since our dependency
chain for genksyms does not include the genksyms program itself
changing, my kernel rebuild didn't show the problem.Fixes: bb3290d91695 ("Remove gperf usage from toolchain")
Reported-by: Masahiro Yamada
Signed-off-by: Linus Torvalds -
Only the media PDF book was requiring adjustbox, in order to
scale big tables. That worked pretty good with Sphinx versions
1.4 and 1.5, but Spinx 1.6 changed the way tables are produced,
by introducing some weird macros before tabulary.
That causes adjustbox to fail. So, it can't be used anymore,
and its usage was removed from the media book.So, let's remove it from conf.py and sphinx-pre-install.
Signed-off-by: Mauro Carvalho Chehab
Signed-off-by: Jonathan Corbet
08 Sep, 2017
3 commits
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Remove our use of 'gperf' for generating perfect hashes from some of our
build tools.This removal was prompted by Masahiro Yamada sending out a patch that
removes all our pre-generated files, and when I tested it, I noticed
that the gperf version I have (3.1) apparently generates code that no
longer works with out code-base because the function interfaces
generated by gperf have changed.We really don't care that much, and the gperf people changed their
interfaces in ways that makes it annoying to work with them. Tools that
make it hard to use them should not be used, and the kernel is not at
all interested in some autoconf mess. So remove the gperf dependency
entirely.It turns out that if you ignore the pre-generated files, the use of
gperf apparently saved us a whopping fifteen lines of code. It
obviously wasn't worth it, considering that the pre-generated files are
about 500 lines.I sent this out as a patch about three weeks ago, and got absolutely
zero responses. So let's see if anybody notices now that I merge it.
Because there might be serious bugs here, but it WorksForMe(tm).* gperf-removal:
Remove gperf usage from toolchain -
Pull gcc plugins update from Kees Cook:
"This finishes the porting work on randstruct, and introduces a new
option to structleak, both noted below:- For the randstruct plugin, enable automatic randomization of
structures that are entirely function pointers (along with a couple
designated initializer fixes).- For the structleak plugin, provide an option to perform zeroing
initialization of all otherwise uninitialized stack variables that
are passed by reference (Ard Biesheuvel)"* tag 'gcc-plugins-v4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
gcc-plugins: structleak: add option to init all vars used as byref args
randstruct: Enable function pointer struct detection
drivers/net/wan/z85230.c: Use designated initializers
drm/amd/powerplay: rv: Use designated initializers -
Pull DeviceTree updates from Rob Herring:
"There's a few orphans in the conversion to %pOF printf specifiers
included here that no one else picked up.Summary:
- Convert more DT code to use of_property_read_* API.
- Improve DT overlay support when adding multiple overlays
- Convert printk's to %pOF format specifiers. Most went via subsystem
trees, but picked up the remaining orphans- Correct unittests to use preferred "okay" for "status" property
value- Add a KASLR seed property
- Vendor prefixes for Mellanox, Theobroma System, Adaptrum, Moxa
- Fix modalias buffer handling
- Clean-up of include paths for building dtbs
- Add bindings for amc6821, isl1208, tsl2x7x, srf02, and srf10
devices- Add nvmem bindings for MediaTek MT7623 and MT7622 SoC
- Add compatible string for Allwinner H5 Mali-450 GPU
- Fix links to old OpenFirmware docs with new mirror on
devicetree.org- Remove status property from binding doc examples"
* tag 'devicetree-for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: (45 commits)
devicetree: Adjust status "ok" -> "okay" under drivers/of/
dt-bindings: Remove "status" from examples
dt-bindings: pinctrl: sh-pfc: Use generic node name
dt-bindings: Add vendor Mellanox
dt-binding: net/phy: fix interrupts description
virt: Convert to using %pOF instead of full_name
macintosh: Convert to using %pOF instead of full_name
ide: pmac: Convert to using %pOF instead of full_name
microblaze: Convert to using %pOF instead of full_name
dt-bindings: usb: musb: Grammar s/the/to/, s/is/are/
of: Use PLATFORM_DEVID_NONE definition
of/device: Fix of_device_get_modalias() buffer handling
of/device: Prevent buffer overflow in of_device_modalias()
dt-bindings: add amc6821, isl1208 trivial bindings
dt-bindings: add vendor prefix for Theobroma Systems
of: search scripts/dtc/include-prefixes path for both CPP and DTC
of: remove arch/$(SRCARCH)/boot/dts from include search path for CPP
of: remove drivers/of/testcase-data from include search path for CPP
of: return of_get_cpu_node from of_cpu_device_node_get if CPUs are not registered
iio: srf08: add device tree binding for srf02 and srf10
...
07 Sep, 2017
1 commit
-
There is code duplication between sec_name() and sech_name(). Simplify
sec_name() by re-using sech_name(). Also, move them up to remove the
forward declaration of sec_name().Link: http://lkml.kernel.org/r/1502248721-22009-1-git-send-email-yamada.masahiro@socionext.com
Signed-off-by: Masahiro Yamada
Reviewed-by: Kees Cook
Cc: Nicholas Piggin
Cc: Jessica Yu
Cc: Chris Metcalf
Cc: Heinrich Schuchardt
Cc: Ingo Molnar
Cc: Ard Biesheuvel
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
05 Sep, 2017
1 commit
-
Pull x86 asm updates from Ingo Molnar:
- Introduce the ORC unwinder, which can be enabled via
CONFIG_ORC_UNWINDER=y.The ORC unwinder is a lightweight, Linux kernel specific debuginfo
implementation, which aims to be DWARF done right for unwinding.
Objtool is used to generate the ORC unwinder tables during build, so
the data format is flexible and kernel internal: there's no
dependency on debuginfo created by an external toolchain.The ORC unwinder is almost two orders of magnitude faster than the
(out of tree) DWARF unwinder - which is important for perf call graph
profiling. It is also significantly simpler and is coded defensively:
there has not been a single ORC related kernel crash so far, even
with early versions. (knock on wood!)But the main advantage is that enabling the ORC unwinder allows
CONFIG_FRAME_POINTERS to be turned off - which speeds up the kernel
measurably:With frame pointers disabled, GCC does not have to add frame pointer
instrumentation code to every function in the kernel. The kernel's
.text size decreases by about 3.2%, resulting in better cache
utilization and fewer instructions executed, resulting in a broad
kernel-wide speedup. Average speedup of system calls should be
roughly in the 1-3% range - measurements by Mel Gorman [1] have shown
a speedup of 5-10% for some function execution intense workloads.The main cost of the unwinder is that the unwinder data has to be
stored in RAM: the memory cost is 2-4MB of RAM, depending on kernel
config - which is a modest cost on modern x86 systems.Given how young the ORC unwinder code is it's not enabled by default
- but given the performance advantages the plan is to eventually make
it the default unwinder on x86.See Documentation/x86/orc-unwinder.txt for more details.
- Remove lguest support: its intended role was that of a temporary
proof of concept for virtualization, plus its removal will enable the
reduction (removal) of the paravirt API as well, so Rusty agreed to
its removal. (Juergen Gross)- Clean up and fix FSGS related functionality (Andy Lutomirski)
- Clean up IO access APIs (Andy Shevchenko)
- Enhance the symbol namespace (Jiri Slaby)
* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (47 commits)
objtool: Handle GCC stack pointer adjustment bug
x86/entry/64: Use ENTRY() instead of ALIGN+GLOBAL for stub32_clone()
x86/fpu/math-emu: Add ENDPROC to functions
x86/boot/64: Extract efi_pe_entry() from startup_64()
x86/boot/32: Extract efi_pe_entry() from startup_32()
x86/lguest: Remove lguest support
x86/paravirt/xen: Remove xen_patch()
objtool: Fix objtool fallthrough detection with function padding
x86/xen/64: Fix the reported SS and CS in SYSCALL
objtool: Track DRAP separately from callee-saved registers
objtool: Fix validate_branch() return codes
x86: Clarify/fix no-op barriers for text_poke_bp()
x86/switch_to/64: Rewrite FS/GS switching yet again to fix AMD CPUs
selftests/x86/fsgsbase: Test selectors 1, 2, and 3
x86/fsgsbase/64: Report FSBASE and GSBASE correctly in core dumps
x86/fsgsbase/64: Fully initialize FS and GS state in start_thread_common
x86/asm: Fix UNWIND_HINT_REGS macro for older binutils
x86/asm/32: Fix regs_get_register() on segment registers
x86/xen/64: Rearrange the SYSCALL entries
x86/asm/32: Remove a bunch of '& 0xffff' from pt_regs segment reads
...
04 Sep, 2017
1 commit
-
Pull documentation updates from Jonathan Corbet:
"After a fair amount of churn in the last couple of cycles, docs are
taking it easier this time around. Lots of fixes and some new
documentation, but nothing all that radical. Perhaps the most
interesting change for many is the scripts/sphinx-pre-install tool
from Mauro; it will tell you exactly which packages you need to
install to get a working docs toolchain on your system.There are two little patches reaching outside of Documentation/; both
just tweak kerneldoc comments to eliminate warnings and fix some
dangling doc pointers"* 'docs-next' of git://git.lwn.net/linux: (52 commits)
Documentation/sphinx: fix kernel-doc decode for non-utf-8 locale
genalloc: Fix an incorrect kerneldoc comment
doc: Add documentation for the genalloc subsystem
assoc_array: fix path to assoc_array documentation
kernel-doc parser mishandles declarations split into lines
docs: ReSTify table of contents in core.rst
docs: process: drop git snapshots from applying-patches.rst
Documentation:input: fix typo
swap: Remove obsolete sentence
sphinx.rst: Allow Sphinx version 1.6 at the docs
docs-rst: fix verbatim font size on tables
Documentation: stable-kernel-rules: fix broken git urls
rtmutex: update rt-mutex
rtmutex: update rt-mutex-design
docs: fix minimal sphinx version in conf.py
docs: fix nested numbering in the TOC
NVMEM documentation fix: A minor typo
docs-rst: pdf: use same vertical margin on all Sphinx versions
doc: Makefile: if sphinx is not found, run a check script
docs: Fix paths in security/keys
...
02 Sep, 2017
1 commit
-
Previously, .config was used in buildtar script regardless of the value of
KCONFIG_CONFIG.Signed-off-by: Nicolas Porcel
Signed-off-by: Masahiro Yamada
01 Sep, 2017
1 commit
-
We have lots of dead defines and macros in drivers, lets offer users a way
to detect and eventually remove them.Signed-off-by: Johannes Thumshirn
Signed-off-by: Masahiro Yamada
