Re: i386: kernel/sched/debug.c:341:57: error: integer overflow in expression of type 'long int' results in '-100663296' [-Werror=overflow]

[Dan Carpenter]

On Thu, Aug 01, 2024 at 08:42:07PM +0530, Naresh Kamboju wrote:
> The i386 kselftest merge config build failed due to following warnings / errors
> on today's Linux next-20240801 tag with gcc-13.
> 
> Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>
> 
> Build log:
> --------
> In file included from kernel/sched/build_utility.c:72:
> kernel/sched/debug.c:341:57: error: integer overflow in expression of
> type 'long int' results in '-100663296' [-Werror=overflow]
>   341 | static unsigned long fair_server_period_max = (1 << 22) *
> NSEC_PER_USEC; /* ~4 seconds */
>       |                                                         ^
> cc1: all warnings being treated as errors

It needs to be 1U << 22.  It's probably more traditional to write it as
1UL << 22, although they equivalent here.

I can send a patch for that.

regards,
dan carpenter