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authorGuo Ren <guoren@linux.alibaba.com>2020-12-28 12:08:46 +0000
committerGuo Ren <guoren@linux.alibaba.com>2021-01-12 09:52:41 +0800
commit78bfa70b16e6db0144a27a10a57348ab967738b6 (patch)
tree0c0c995d21464ad8af5528fcb71c7a732a967cd3 /arch/csky/mm
parent1152cb5a9a84c273e666a59ed8308ef15b7d00f3 (diff)
csky: Fixup FAULT_FLAG_XXX param for handle_mm_fault
The past code only passes the FAULT_FLAG_WRITE into handle_mm_fault and missing USER & DEFAULT & RETRY. The patch references to arch/riscv/mm/fault.c, but there is no FAULT_FLAG_INSTRUCTION in csky hw. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Diffstat (limited to 'arch/csky/mm')
-rw-r--r--arch/csky/mm/fault.c23
1 files changed, 21 insertions, 2 deletions
diff --git a/arch/csky/mm/fault.c b/arch/csky/mm/fault.c
index e888acf1c403..cecca6729b04 100644
--- a/arch/csky/mm/fault.c
+++ b/arch/csky/mm/fault.c
@@ -80,6 +80,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
struct vm_area_struct *vma = NULL;
struct task_struct *tsk = current;
struct mm_struct *mm = tsk->mm;
+ unsigned int flags = FAULT_FLAG_DEFAULT;
int si_code;
int fault;
unsigned long address = read_mmu_entryhi() & PAGE_MASK;
@@ -150,6 +151,13 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
if (in_atomic() || !mm)
goto bad_area_nosemaphore;
+ if (user_mode(regs))
+ flags |= FAULT_FLAG_USER;
+
+ if (is_write(regs))
+ flags |= FAULT_FLAG_WRITE;
+
+retry:
mmap_read_lock(mm);
vma = find_vma(mm, address);
if (!vma)
@@ -180,8 +188,7 @@ good_area:
* make sure we exit gracefully rather than endlessly redo
* the fault.
*/
- fault = handle_mm_fault(vma, address, is_write(regs) ? FAULT_FLAG_WRITE : 0,
- regs);
+ fault = handle_mm_fault(vma, address, flags, regs);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
@@ -191,6 +198,18 @@ good_area:
goto bad_area;
BUG();
}
+
+ if (unlikely((fault & VM_FAULT_RETRY) && (flags & FAULT_FLAG_ALLOW_RETRY))) {
+ flags |= FAULT_FLAG_TRIED;
+
+ /*
+ * No need to mmap_read_unlock(mm) as we would
+ * have already released it in __lock_page_or_retry
+ * in mm/filemap.c.
+ */
+ goto retry;
+ }
+
mmap_read_unlock(mm);
return;