diff options
| author | Andrey Ryabinin <aryabinin@virtuozzo.com> | 2015-10-22 13:32:24 -0700 |
|---|---|---|
| committer | Seung-Woo Kim <sw0312.kim@samsung.com> | 2017-01-18 13:59:08 +0900 |
| commit | e0c79de8722ecd91b1642c4a7f58f43118615f71 (patch) | |
| tree | 93018df58fce0742da4945fdd14e4b3def8794cb | |
| parent | 54df3e5cb316dc40094213d5cc79b3f63cd410d5 (diff) | |
lib/Kconfig.debug: disable -Wframe-larger-than warnings with KASAN=y
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>
[Backport from mainline to remove build warning from KASAN option with GCC 6]
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Change-Id: I765080564f7b312fd48988b2f70aaa6f9b2eb71c
| -rw-r--r-- | lib/Kconfig.debug | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 1bc4922f4a33..ef4a68c60a8a 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -197,6 +197,7 @@ config ENABLE_MUST_CHECK config FRAME_WARN int "Warn for stack frames larger than (needs gcc 4.4)" range 0 8192 + default 0 if KASAN default 1024 if !64BIT default 2048 if 64BIT help |