On Thu, Feb 13, 2020 at 11:42:07PM -0700, Nathan Chancellor wrote:
> Clang warns:
>
> In file included from ../arch/s390/purgatory/purgatory.c:10:
> In file included from ../include/linux/kexec.h:18:
> In file included from ../include/linux/crash_core.h:6:
> In file included from ../include/linux/elfcore.h:5:
> In file included from ../include/linux/user.h:1:
> In file included from ../arch/s390/include/asm/user.h:11:
> ../arch/s390/include/asm/page.h:45:6: warning: converting the result of
> '<<' to a boolean always evaluates to false
> [-Wtautological-constant-compare]
> if (PAGE_DEFAULT_KEY)
> ^
> ../arch/s390/include/asm/page.h:23:44: note: expanded from macro
> 'PAGE_DEFAULT_KEY'
> #define PAGE_DEFAULT_KEY (PAGE_DEFAULT_ACC << 4)
> ^
> 1 warning generated.
>
> Explicitly compare this against zero to silence the warning as it is
> intended to be used in a boolean context.
>
> Fixes: de3fa841e429 ("s390/mm: fix compile for PAGE_DEFAULT_KEY != 0")
> Link: https://github.com/ClangBuiltLinux/linux/issues/860
> Signed-off-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
> ---
Applied to fixes, thanks
