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>
---
diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 089fcb9cfce3..c8beec6d7df0 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -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;
--
Jens Axboe
