riscv: mm: accelerate pagefault when badaccess

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>

diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
index 5224f37..b3fcf7d 100644 (file)
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c
@@ -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;
        }