On 10/29/2020 11:28 PM, Andrey Konovalov wrote:
On Sun, Oct 25, 2020 at 8:17 PM Andrew Morton <a...@linux-foundation.org> wrote:
On Mon, 26 Oct 2020 02:15:37 +0800 kernel test robot <l...@intel.com> wrote:
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
master
head: d76913908102044f14381df865bb74df17a538cb
commit: cae9dc35ed9ff82a99754e51d57ff6c332e1f7e4 kasan: allow enabling stack
tagging for tag-based mode
date: 3 months ago
config: arm64-randconfig-r005-20201026 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project
1c8371692dfe8245bc6690ff1262dcced4649d21)
reproduce (this is a W=1 build):
wget
https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O
~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm64 cross compiling tool for clang build
# apt-get install binutils-aarch64-linux-gnu
#
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cae9dc35ed9ff82a99754e51d57ff6c332e1f7e4
git remote add linus
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout cae9dc35ed9ff82a99754e51d57ff6c332e1f7e4
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <l...@intel.com>
All warnings (new ones prefixed by >>):
drivers/video/backlight/ltv350qv.c:192:12: warning: stack frame size of 13472
bytes in function 'ltv350qv_power' [-Wframe-larger-than=]
That's a lot of stack.
static int ltv350qv_power(struct ltv350qv *lcd, int power)
^
1 warning generated.
vim +/ltv350qv_power +192 drivers/video/backlight/ltv350qv.c
Odd - the code looks pretty normal. It is possible that your compiler
is (crazily) inlining ltv350qv_write_reg()?
This is the same issue in LLVM that was reported by Arnd for generic
KASAN (also see KASAN_STACK_ENABLE option description). By default
KASAN shouldn't have stack instrumentation enabled unless
KASAN_STACK_ENABLE is specified. Perhaps it makes sense to disable it
for KASAN_SW_TAGS config on the kernel test robot.
Hi Andrey,
Thanks for your advice, we'll take a look.
Best Regards,
Rong Chen
[1] https://bugs.llvm.org/show_bug.cgi?id=38809
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