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.
Reported-by: Fengguang Wu <fengguang...@intel.com>
Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com>
---
lib/Kconfig.debug | 1 +
1 file changed, 1 insertion(+)
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index ab76b99..1d1521c 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
--
2.4.9
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