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Jani NikulaandGreg Kroah-Hartman
e990211bd0
[ Upstream commit3942bb4972] Almost two thirds of the memchr_inv() usages check if the memory area is all zeros, with no interest in where in the buffer the first non-zero byte is located. Checking for !memchr_inv(s, 0, n) is also not very intuitive or discoverable. Add an explicit mem_is_zero() helper for this use case. Reviewed-by: Kees Cook <kees@kernel.org> Reviewed-by: Andy Shevchenko <andy@kernel.org> Link: https://patchwork.freedesktop.org/patch/msgid/20240814100035.3100852-1-jani.nikula@intel.com Signed-off-by: Jani Nikula <jani.nikula@intel.com> Stable-dep-of:3e6ccd790e("gpio: cdev: check if uAPI v2 config attributes are correctly zeroed") Signed-off-by: Sasha Levin <sashal@kernel.org>