On Sat, Jun 20, 2020 at 09:44:31AM +0800, Guo Ren wrote:

On Sat, Jun 20, 2020 at 12:05 AM Peter Xu [off-list ref] wrote:

quoted

Use the general page fault accounting by passing regs into handle_mm_fault().
It naturally solve the issue of multiple page fault accounting when page fault
retry happened.

CC: Guo Ren <guoren@kernel.org>
CC: linux-csky@vger.kernel.org
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 arch/csky/mm/fault.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/arch/csky/mm/fault.c b/arch/csky/mm/fault.c
index b14f97d3cb15..a3e0aa3ebb79 100644
--- a/arch/csky/mm/fault.c
+++ b/arch/csky/mm/fault.c

@@ -151,7 +151,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
         * the fault.
         */
        fault = handle_mm_fault(vma, address, write ? FAULT_FLAG_WRITE : 0,
-                               NULL);
+                               regs);

what's your kernel version ? （4th arg exsist ?）
        /*
         * If for any reason at all we couldn't handle the fault,
         * make sure we exit gracefully rather than endlessly redo
         * the fault.
         */
        fault = handle_mm_fault(vma, address, write ? FAULT_FLAG_WRITE : 0);
        if (unlikely(fault & VM_FAULT_ERROR)) {

Hi, Guo,

Sorry to be unclear.  This patch is based on patch 1 in the same series:

https://lore.kernel.org/lkml/20200619160538.8641-2-peterx@redhat.com/ (local)

Thanks,

-- 
Peter Xu