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[ Upstream commit10299c07c9] It seems the Clang can see through OPTIMIZER_HIDE_VAR when the constant is coming from sizeof. Adding "volatile" back to these variables solves this false positive without reintroducing the issues that originally led to switching to OPTIMIZER_HIDE_VAR in the first place[1]. Reported-by: Nathan Chancellor <nathan@kernel.org> Closes: https://github.com/ClangBuiltLinux/linux/issues/2075 [1] Cc: Jannik Glückert <jannik.glueckert@gmail.com> Suggested-by: Nathan Chancellor <nathan@kernel.org> Fixes:6ee149f61b("kunit/fortify: Replace "volatile" with OPTIMIZER_HIDE_VAR()") Reviewed-by: Nathan Chancellor <nathan@kernel.org> Link: https://lore.kernel.org/r/20250628234034.work.800-kees@kernel.org Signed-off-by: Kees Cook <kees@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>