Re: [PATCH] block/iocost: silence warning on 'last_period' potentially being unused

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On Wed, Jan 10, 2024 at 08:32:19AM -0700, Jens Axboe wrote:
> If CONFIG_TRACEPOINTS isn't enabled, we assign this variable but then
> never use it. This can cause the compiler to complain about that:
> 
> block/blk-iocost.c:1264:6: warning: variable 'last_period' set but not used [-Wunused-but-set-variable]
>  1264 |         u64 last_period, cur_period;
>       |             ^
> 
> Rather than add ifdefs to guard this, just mark it __maybe_unused.
> 
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Closes: https://lore.kernel.org/oe-kbuild-all/202401102335.GiWdeIo9-lkp@xxxxxxxxx/
> Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>

Acked-by: Tejun Heo <tj@xxxxxxxxxx>

Thanks.

-- 
tejun




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