From: Arnd Bergmann Date: Wed, 18 Jan 2023 08:07:01 +0000 (+0100) Subject: blk-iocost: avoid 64-bit division in ioc_timer_fn X-Git-Tag: v6.1.37~1439 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a744060574889927f2c22a0562d69aa820e3c9e1;p=platform%2Fkernel%2Flinux-starfive.git blk-iocost: avoid 64-bit division in ioc_timer_fn commit 5f2779dfa7b8cc7dfd4a1b6586d86e0d193266f3 upstream. The behavior of 'enum' types has changed in gcc-13, so now the UNBUSY_THR_PCT constant is interpreted as a 64-bit number because it is defined as part of the same enum definition as some other constants that do not fit within a 32-bit integer. This in turn leads to some inefficient code on 32-bit architectures as well as a link error: arm-linux-gnueabi/bin/arm-linux-gnueabi-ld: block/blk-iocost.o: in function `ioc_timer_fn': blk-iocost.c:(.text+0x68e8): undefined reference to `__aeabi_uldivmod' arm-linux-gnueabi-ld: blk-iocost.c:(.text+0x6908): undefined reference to `__aeabi_uldivmod' Split the enum definition to keep the 64-bit timing constants in a separate enum type from those constants that can clearly fit within a smaller type. Signed-off-by: Arnd Bergmann Acked-by: Tejun Heo Link: https://lore.kernel.org/r/20230118080706.3303186-1-arnd@kernel.org Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- diff --git a/block/blk-iocost.c b/block/blk-iocost.c index bfc33fa..b706fd0 100644 --- a/block/blk-iocost.c +++ b/block/blk-iocost.c @@ -256,6 +256,11 @@ enum { VRATE_MIN = VTIME_PER_USEC * VRATE_MIN_PPM / MILLION, VRATE_CLAMP_ADJ_PCT = 4, + /* switch iff the conditions are met for longer than this */ + AUTOP_CYCLE_NSEC = 10LLU * NSEC_PER_SEC, +}; + +enum { /* if IOs end up waiting for requests, issue less */ RQ_WAIT_BUSY_PCT = 5, @@ -294,9 +299,6 @@ enum { /* don't let cmds which take a very long time pin lagging for too long */ MAX_LAGGING_PERIODS = 10, - /* switch iff the conditions are met for longer than this */ - AUTOP_CYCLE_NSEC = 10LLU * NSEC_PER_SEC, - /* * Count IO size in 4k pages. The 12bit shift helps keeping * size-proportional components of cost calculation in closer