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authorJens Axboe <axboe@kernel.dk>2019-04-13 09:28:55 -0600
committerJens Axboe <axboe@kernel.dk>2019-04-13 19:08:22 -0600
commit917257daa0fea7a007102691c0e27d9216a96768 (patch)
treeb9eb940786c1bc428f79025919777848b2fd6e54 /block
parent06058632464845abb1af91521122fd04dd3daaec (diff)
downloadlinux-917257daa0fea7a007102691c0e27d9216a96768.tar.bz2
io_uring: only test SQPOLL cpu after we've verified it
We currently call cpu_possible() even if we don't use the CPU. Move the test under the SQ_AFF branch, which is the only place where we'll use the value. Do the cpu_possible() test AFTER we've limited it to a max of NR_CPUS. This avoids triggering the following warning: WARNING: CPU: 1 PID: 7600 at include/linux/cpumask.h:121 cpu_max_bits_warn if CONFIG_DEBUG_PER_CPU_MAPS is enabled. While in there, also move the SQ thread idle period assignment inside SETUP_SQPOLL, as we don't use it otherwise either. Reported-by: syzbot+cd714a07c6de2bc34293@syzkaller.appspotmail.com Fixes: 6c271ce2f1d5 ("io_uring: add submission polling") Signed-off-by: Jens Axboe <axboe@kernel.dk>
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