linux-stable.git/kernel/gcov, branch v3.18.136

gcov: disable for COMPILE_TEST

2018-01-31T13:46:11+00:00

commit cc622420798c4bcf093785d872525087a7798db9 upstream.

Enabling gcov is counterproductive to compile testing: it significantly
increases the kernel image size, compile time, and it produces lots
of false positive "may be used uninitialized" warnings as the result
of missed optimizations.

This is in line with how UBSAN_SANITIZE_ALL and PROFILE_ALL_BRANCHES
work, both of which have similar problems.

With an ARM allmodconfig kernel, I see the build time drop from
283 minutes CPU time to 225 minutes, and the vmlinux size drops
from 43MB to 26MB.

Signed-off-by: Arnd Bergmann 
Acked-by: Peter Oberparleiter 
Signed-off-by: Michal Marek 
Signed-off-by: Greg Kroah-Hartman

gcov: support GCC 7.1

2017-09-02T05:05:45+00:00

commit 05384213436ab690c46d9dfec706b80ef8d671ab upstream.

Starting from GCC 7.1, __gcov_exit is a new symbol expected to be
implemented in a profiling runtime.

[akpm@linux-foundation.org: coding-style fixes]
[mliska@suse.cz: v2]
  Link: http://lkml.kernel.org/r/e63a3c59-0149-c97e-4084-20ca8f146b26@suse.cz
Link: http://lkml.kernel.org/r/8c4084fa-3885-29fe-5fc4-0d4ca199c785@suse.cz
Signed-off-by: Martin Liska 
Acked-by: Peter Oberparleiter 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

gcov: add support for gcc version >= 6

2017-09-02T05:05:45+00:00

commit d02038f972538b93011d78c068f44514fbde0a8c upstream.

Link: http://lkml.kernel.org/r/20160701130914.GA23225@styxhp
Signed-off-by: Florian Meier 
Reviewed-by: Peter Oberparleiter 
Tested-by: Peter Oberparleiter 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

gcov: add support for GCC 5.1

2017-09-02T05:05:45+00:00

commit 3e44c471a2dab210f7e9b1e5f7d4d54d52df59eb upstream.

Fix kernel gcov support for GCC 5.1.  Similar to commit a992bf836f9
("gcov: add support for GCC 4.9"), this patch takes into account the
existence of a new gcov counter (see gcc's gcc/gcov-counter.def.)

Firstly, it increments GCOV_COUNTERS (to 10), which makes the data
structure struct gcov_info compatible with GCC 5.1.

Secondly, a corresponding counter function __gcov_merge_icall_topn (Top N
value tracking for indirect calls) is included in base.c with the other
gcov counters unused for kernel profiling.

Signed-off-by: Lorenzo Stoakes 
Cc: Andrey Ryabinin 
Cc: Yuan Pengfei 
Tested-by: Peter Oberparleiter 
Reviewed-by: Peter Oberparleiter 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

gcov: add ARM64 to GCOV_PROFILE_ALL

2014-10-29T23:33:14+00:00

Following up the arm testing of gcov, turns out gcov on ARM64 works fine
as well.  Only change needed is adding ARM64 to Kconfig depends.

Tested with qemu and mach-virt

Signed-off-by: Riku Voipio 
Acked-by: Peter Oberparleiter 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

ARM: 8153/1: Enable gcov support on the ARM architecture

2014-09-26T13:39:57+00:00

Enable gcov support for ARM based on original patches by David
Singleton and George G. Davis

Riku - updated to patch to current mainline kernel. The patch
has been submitted in 2010, 2012 - for symmetry, now in 2014 too.

https://lwn.net/Articles/390419/
http://marc.info/?l=linux-arm-kernel&m=133823081813044

v2: remove arch/arm/kernel from gcov disabled files

Cc: Andrey Ryabinin 
Cc: Naresh Kamboju 
Acked-by: Arnd Bergmann 
Signed-off-by: Riku Voipio 
Signed-off-by: Vincent Sanders 
Signed-off-by: Russell King

kernel/gcov/fs.c: remove unnecessary null test before debugfs_remove

2014-08-08T22:57:24+00:00

This fixes checkpatch warning:

  WARNING: debugfs_remove(NULL) is safe this check is probably not required

Signed-off-by: Fabian Frederick 
Cc: Peter Oberparleiter 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

gcov: add support for GCC 4.9

2014-06-10T22:34:46+00:00

This patch handles the gcov-related changes in GCC 4.9:

  A new counter (time profile) is added. The total number is 9 now.

  A new profile merge function __gcov_merge_time_profile is added.

See gcc/gcov-io.h and libgcc/libgcov-merge.c

For the first change, the layout of struct gcov_info is affected.

For the second one, a dummy function is added to kernel/gcov/base.c
similarly.

Signed-off-by: Yuan Pengfei 
Acked-by: Peter Oberparleiter 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

gcov: reuse kbasename helper

2013-11-13T03:09:34+00:00

To get name of the file from a pathname let's use kbasename() helper.

Signed-off-by: Andy Shevchenko 
Cc: Jingoo Han 
Cc: Peter Oberparleiter 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kernel/gcov/fs.c: use pr_warn()

2013-11-13T03:09:34+00:00

pr_warning() is deprecated in favor of pr_warn()

Cc: Andy Gospodarek 
Cc: Arnd Bergmann 
Cc: Frantisek Hrbata 
Cc: Jan Stancek 
Cc: Kees Cook 
Cc: Peter Oberparleiter 
Cc: Rusty Russell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds