[PATCH v2 3/7] arm: mm: accelerate pagefault when VM_FAULT_BADACCESS

[Kefeng Wang]

The vm_flags of vma already checked under per-VMA lock, if it is a
bad access, directly set fault to VM_FAULT_BADACCESS and 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 <sur...@google.com>
Signed-off-by: Kefeng Wang <wangkefeng.w...@huawei.com>
---
 arch/arm/mm/fault.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index 439dc6a26bb9..5c4b417e24f9 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -294,7 +294,9 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct 
pt_regs *regs)
 
        if (!(vma->vm_flags & vm_flags)) {
                vma_end_read(vma);
-               goto lock_mmap;
+               count_vm_vma_lock_event(VMA_LOCK_SUCCESS);
+               fault = VM_FAULT_BADACCESS;
+               goto bad_area;
        }
        fault = handle_mm_fault(vma, addr, flags | FAULT_FLAG_VMA_LOCK, regs);
        if (!(fault & (VM_FAULT_RETRY | VM_FAULT_COMPLETED)))
-- 
2.27.0