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authorJann Horn <jannh@google.com>2020-03-05 23:06:57 +0100
committerPeter Zijlstra <peterz@infradead.org>2020-04-30 20:14:38 +0200
commit586b58cac8b4683eb58a1446fbc399de18974e40 (patch)
treea31aa2ff43c541f2ee7d098369379effb2ffffe4 /fs/libfs.c
parentsched/fair: Simplify the code of should_we_balance() (diff)
downloadlinux-586b58cac8b4683eb58a1446fbc399de18974e40.tar.xz
linux-586b58cac8b4683eb58a1446fbc399de18974e40.zip
exit: Move preemption fixup up, move blocking operations down
With CONFIG_DEBUG_ATOMIC_SLEEP=y and CONFIG_CGROUPS=y, kernel oopses in non-preemptible context look untidy; after the main oops, the kernel prints a "sleeping function called from invalid context" report because exit_signals() -> cgroup_threadgroup_change_begin() -> percpu_down_read() can sleep, and that happens before the preempt_count_set(PREEMPT_ENABLED) fixup. It looks like the same thing applies to profile_task_exit() and kcov_task_exit(). Fix it by moving the preemption fixup up and the calls to profile_task_exit() and kcov_task_exit() down. Fixes: 1dc0fffc48af ("sched/core: Robustify preemption leak checks") Signed-off-by: Jann Horn <jannh@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20200305220657.46800-1-jannh@google.com
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