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riscv: mm: accelerate pagefault when badaccess

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The access_error() of vma already checked under per-VMA lock, if it
is a bad access, directly handle error, no need to retry with mmap_lock
again. Since the page faut is handled under per-VMA lock, count it as
a vma lock event with VMA_LOCK_SUCCESS.

Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Tested-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20240403083805.1818160-6-wangkefeng.wang@huawei.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Kefeng Wang 2024-04-03 16:38:03 +08:00 committed by Palmer Dabbelt
parent 9850e73e82
commit 4c6c002042
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1 changed files with 2 additions and 2 deletions
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4
arch/riscv/mm/fault.c
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@ -293,8 +293,8 @@ void handle_page_fault(struct pt_regs *regs)
if (unlikely(access_error(cause, vma))) {
vma_end_read(vma);
count_vm_vma_lock_event(VMA_LOCK_SUCCESS);
tsk->thread.bad_cause = cause;
bad_area_nosemaphore(regs, SEGV_ACCERR, addr);
tsk->thread.bad_cause = SEGV_ACCERR;
bad_area_nosemaphore(regs, code, addr);
return;
}