Hi Marc,

On 23/01/2020 09:58, Marc Gonzalez wrote:
[...]

> 
> I haven't upgraded sparse yet, but I've been playing with make W=1 lately,
> using gcc 9.2. On v5.5-rc1, I see the following warnings:
> 
>   CC      arch/arm64/kernel/vdso/vgettimeofday.o
> In file included from <command-line>:
> /home/mgonzalez/linux/lib/vdso/gettimeofday.c:224:5: warning: no previous prototype for '__cvdso_clock_getres' [-Wmissing-prototypes]
>   224 | int __cvdso_clock_getres(clockid_t clock, struct __kernel_timespec *res)
>       |     ^~~~~~~~~~~~~~~~~~~~
> arch/arm64/kernel/vdso/vgettimeofday.c:11:5: warning: no previous prototype for '__kernel_clock_gettime' [-Wmissing-prototypes]
>    11 | int __kernel_clock_gettime(clockid_t clock,
>       |     ^~~~~~~~~~~~~~~~~~~~~~
> arch/arm64/kernel/vdso/vgettimeofday.c:17:5: warning: no previous prototype for '__kernel_gettimeofday' [-Wmissing-prototypes]
>    17 | int __kernel_gettimeofday(struct __kernel_old_timeval *tv,
>       |     ^~~~~~~~~~~~~~~~~~~~~
> arch/arm64/kernel/vdso/vgettimeofday.c:23:5: warning: no previous prototype for '__kernel_clock_getres' [-Wmissing-prototypes]
>    23 | int __kernel_clock_getres(clockid_t clock_id,
>       |     ^~~~~~~~~~~~~~~~~~~~~
> 
> 
> I suppose the __cvdso_clock_getres warning is fixed in v5.6?
>

This should be fixed in 5.5 went via tip/urgent.
Gitweb:
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=ffd08731b2d632459428612431060cf902324a8d

> The other warnings might be false positives?
>

Yes, this is correct.

> Regards.
> 

-- 
Regards,
Vincenzo