1e744351bc
As reported by Nathan, when building avs driver using clang with:
CONFIG_COMPILE_TEST=y
CONFIG_FORTIFY_SOURCE=y
CONFIG_KASAN=y
CONFIG_PCI=y
CONFIG_SOUND=y
CONFIG_SND=y
CONFIG_SND_SOC=y
CONFIG_SND_SOC_INTEL_AVS=y
there are reports of too big stack use, like:
sound/soc/intel/avs/path.c:815:18: error: stack frame size (2176) exceeds limit (2048) in 'avs_path_create' [-Werror,-Wframe-larger-than]
struct avs_path *avs_path_create(struct avs_dev *adev, u32 dma_id,
^
1 error generated.
This is apparently caused by inlining many calls to guid_equal which
inlines fortified memcpy, using 2 size_t variables.
Instead of hardcoding many calls to guid_equal, use lookup table with
one call, this improves stack usage.
Link: https://lore.kernel.org/alsa-devel/YtlzY9aYdbS4Y3+l@dev-arch.thelio-3990X/T/
Link: https://github.com/ClangBuiltLinux/linux/issues/1642
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Reported-by: Nathan Chancellor <nathan@kernel.org>
Build-tested-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20220722111959.2588597-1-amadeuszx.slawinski@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>