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block/iocost: silence warning on 'last_period' potentially being unused

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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@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202401102335.GiWdeIo9-lkp@intel.com/
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2024-01-10 08:29:53 -07:00
parent c8300953ba
commit 742e324a06
1 changed files with 1 additions and 1 deletions
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2
block/blk-iocost.c
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@ -1261,7 +1261,7 @@ static void weight_updated(struct ioc_gq *iocg, struct ioc_now *now)
static bool iocg_activate(struct ioc_gq *iocg, struct ioc_now *now)
{
struct ioc *ioc = iocg->ioc;
u64 last_period, cur_period;
u64 __maybe_unused last_period, cur_period;
u64 vtime, vtarget;
int i;