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authorKefeng Wang <wangkefeng.wang@huawei.com>2024-04-03 16:38:05 +0800
committerAndrew Morton <akpm@linux-foundation.org>2024-04-25 20:56:40 -0700
commitbc7996c864bf58102f640474e04ec5ab04911ac1 (patch)
tree8b9abd63dbf484f69e3330a733829b33ae6d306e /mm/swap_state.c
parent82b7a618397c80736506c05d9add4aaea91297e8 (diff)
downloadlwn-bc7996c864bf58102f640474e04ec5ab04911ac1.tar.gz
lwn-bc7996c864bf58102f640474e04ec5ab04911ac1.zip
x86: mm: accelerate pagefault when badaccess
The access_error() of vma is already checked under per-VMA lock, if it is a bad access, directly handle error, no need to retry with mmap_lock again. In order to release the correct lock, pass the mm_struct into bad_area_access_error(). If mm is NULL, release vma lock, or release mmap_lock. Since the page faut is handled under per-VMA lock, count it as a vma lock event with VMA_LOCK_SUCCESS. Link: https://lkml.kernel.org/r/20240403083805.1818160-8-wangkefeng.wang@huawei.com Reviewed-by: Suren Baghdasaryan <surenb@google.com> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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