From: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> Subject: vfree: add debug might_sleep() Add might_sleep() call to vfree() to catch potential sleep-in-atomic bugs earlier. [aryabinin@xxxxxxxxxxxxx: drop might_sleep_if() from kvfree()] Link: http://lkml.kernel.org/r/7e19e4df-b1a6-29bd-9ae7-0266d50bef1d@xxxxxxxxxxxxx Link: http://lkml.kernel.org/r/20180914130512.10394-3-aryabinin@xxxxxxxxxxxxx Signed-off-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx> Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/vmalloc.c | 2 ++ 1 file changed, 2 insertions(+) --- a/mm/vmalloc.c~vfree-kvfree-add-debug-might-sleeps +++ a/mm/vmalloc.c @@ -1587,6 +1587,8 @@ void vfree(const void *addr) kmemleak_free(addr); + might_sleep_if(!in_interrupt()); + if (!addr) return; if (unlikely(in_interrupt())) _
