path: root/block/blk-throttle.c
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authorVivek Goyal <vgoyal@redhat.com>2010-10-22 09:48:43 +0200
committerJens Axboe <jaxboe@fusionio.com>2010-10-22 09:48:43 +0200
commitb4627321e18582dcbdeb45d77df29d3177107c65 (patch)
treef494dae7f39f219d73aa9752dfd3844293d65f50 /block/blk-throttle.c
parent11a691bea48887c27425cc40bf291e74c922df25 (diff)
cfq-iosched: Fix a gcc 4.5 warning and put some comments
- Andi encountedred following warning with gcc 4.5 linux/block/cfq-iosched.c: In function ‘cfq_dispatch_requests’: linux/block/cfq-iosched.c:2156:3: warning: array subscript is above array bounds - Warning happens due to following code. slice = group_slice * count / max_t(unsigned, cfqg->busy_queues_avg[cfqd->serving_prio], cfq_group_busy_queues_wl(cfqd->serving_prio, cfqd, cfqg)); gcc is complaining about cfqg->busy_queues_avg[] being indexed by CFQ prio classes (RT, BE and IDLE) while the array size is only 2. - At run time, we never access cfqg->busy_queues_avg[IDLE] and return from function before this code hits. - To fix warning increase the array size though it will remain unused. This patch also puts some comments to clarify some of the confusions. - I have taken Jens's patch and modified it a bit. - Compile tested with gcc 4.4 and boot tested. I don't have gcc 4.5 running, Andi can you please test it with gcc 4.5 to make sure it worked. Reported-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Acked-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block/blk-throttle.c')
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