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Andrey Ryabinin 0a373d4fc2 x86/unwinder/guess: Prevent using CONFIG_UNWINDER_GUESS=y with CONFIG_STACKDEPOT=y 
Stackdepot doesn't work well with CONFIG_UNWINDER_GUESS=y.
The 'guess' unwinder generate awfully large and inaccurate stacktraces,
thus stackdepot can't deduplicate stacktraces because they all look like
unique. Eventually stackdepot reaches its capacity limit:

  WARNING: CPU: 0 PID: 545 at lib/stackdepot.c:119 depot_save_stack+0x28e/0x550
  Call Trace:
   ? kasan_kmalloc+0x144/0x160
   ? depot_save_stack+0x1f5/0x550
   ? do_raw_spin_unlock+0xda/0xf0
   ? preempt_count_sub+0x13/0xc0

  <...90 lines...>

   ? do_raw_spin_unlock+0xda/0xf0

Add a STACKDEPOT=n dependency to UNWINDER_GUESS to avoid the problem.

Reported-by: kernel test robot <xiaolong.ye@intel.com>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Acked-by: Dmitry Vyukov <dvyukov@google.com>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20171130123554.4330-1-aryabinin@virtuozzo.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-12-11 19:07:07 +01:00
..
alpha Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
arc Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
arm Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
arm64 Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:33:11 -08:00
blackfin Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
c6x License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
cris License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
frv License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
h8300 License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
hexagon Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
ia64 Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
m32r Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
m68k Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
metag Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
microblaze License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
mips Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
mn10300 Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
nios2 License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
openrisc OpenRISC updates for v4.15 2017-11-13 12:12:00 -08:00
parisc Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
powerpc Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
s390 Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
score License cleanup: add SPDX license identifier to uapi header files with no license 2017-11-02 11:19:54 +01:00
sh Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
sparc Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
tile Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
um Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +01:00
unicore32 License cleanup: add SPDX license identifier to uapi header files with a license 2017-11-02 11:20:11 +01:00
x86 x86/unwinder/guess: Prevent using CONFIG_UNWINDER_GUESS=y with CONFIG_STACKDEPOT=y 2017-12-11 19:07:07 +01:00
xtensa Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:56:58 -08:00
.gitignore
Kconfig Merge branch 'linus' into perf/core, to fix conflicts 2017-11-07 10:30:18 +01:00