On Sat, Feb 08, 2020 at 07:08:59AM -0700, Nathan Chancellor wrote:
> Clang warns:
>
> In file included from ../arch/s390/boot/startup.c:3:
> In file included from ../include/linux/elf.h:5:
> In file included from ../arch/s390/include/asm/elf.h:132:
> In file included from ../include/linux/compat.h:10:
> In file included from ../include/linux/time.h:74:
> In file included from ../include/linux/time32.h:13:
> In file included from ../include/linux/timex.h:65:
> ../arch/s390/include/asm/timex.h:160:20: warning: passing 'unsigned char
> [16]' to parameter of type 'char *' converts between pointers to integer
> types with different sign [-Wpointer-sign]
> get_tod_clock_ext(clk);
> ^~~
> ../arch/s390/include/asm/timex.h:149:44: note: passing argument to
> parameter 'clk' here
> static inline void get_tod_clock_ext(char *clk)
> ^
>
> Change clk's type to just be char so that it matches what happens in
> get_tod_clock_ext.
>
> Fixes: 57b28f66316d ("[S390] s390_hypfs: Add new attributes")
> Link: https://github.com/ClangBuiltLinux/linux/issues/861
> Signed-off-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
> ---
>
> Alternatively, changing the clk type in get_tod_clock_ext to unsigned
> which is what it was in the early 2000s.
>
> arch/s390/include/asm/timex.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/s390/include/asm/timex.h b/arch/s390/include/asm/timex.h
> index 670f14a228e5..6bf3a45ccfec 100644
> --- a/arch/s390/include/asm/timex.h
> +++ b/arch/s390/include/asm/timex.h
> @@ -155,7 +155,7 @@ static inline void get_tod_clock_ext(char *clk)
>
> static inline unsigned long long get_tod_clock(void)
> {
> - unsigned char clk[STORE_CLOCK_EXT_SIZE];
> + char clk[STORE_CLOCK_EXT_SIZE];
>
> get_tod_clock_ext(clk);
> return *((unsigned long long *)&clk[1]);
> --
> 2.25.0
>
Applied, thanks.
I wonder though if Fixes: tag is really required for such changes. It
triggers stable backports (for all stable branches since v2.6.35) and
hence a lot of noise.
