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lib/Kconfig.debug: disable -Wframe-larger-than warnings with KASAN=y

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When the kernel compiled with KASAN=y, GCC adds redzones for each
variable on stack.  This enlarges function's stack frame and causes:

	'warning: the frame size of X bytes is larger than Y bytes'

The worst case I've seen for now is following:

   ../net/wireless/nl80211.c: In function `nl80211_send_wiphy':
   ../net/wireless/nl80211.c:1731:1: warning: the frame size of 5448 bytes is larger than 2048 bytes [-Wframe-larger-than=]

That kind of warning becomes useless with KASAN=y.  It doesn't
necessarily indicate that there is some problem in the code, thus we
should turn it off.

(The KASAN=y stack size in increased from 16k to 32k for this reason)

Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Acked-by: Abylay Ospan <aospan@netup.ru>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mauro Carvalho Chehab <m.chehab@samsung.com>
Cc: Kozlov Sergey <serjk@netup.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Ryabinin 2015-10-22 13:32:24 -07:00 committed by Linus Torvalds
parent 296291cdd1
commit 3f181b4d86
1 changed files with 1 additions and 0 deletions
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lib/Kconfig.debug
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@ -197,6 +197,7 @@ config ENABLE_MUST_CHECK
config FRAME_WARN config FRAME_WARN
int "Warn for stack frames larger than (needs gcc 4.4)" int "Warn for stack frames larger than (needs gcc 4.4)"
range 0 8192 range 0 8192
default 0 if KASAN
default 1024 if !64BIT default 1024 if !64BIT
default 2048 if 64BIT default 2048 if 64BIT
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