diff options
| author | Guo Ren <guoren@linux.alibaba.com> | 2020-12-28 12:08:46 +0000 |
|---|---|---|
| committer | Guo Ren <guoren@linux.alibaba.com> | 2021-01-12 09:52:41 +0800 |
| commit | 78bfa70b16e6db0144a27a10a57348ab967738b6 (patch) | |
| tree | 0c0c995d21464ad8af5528fcb71c7a732a967cd3 /arch/csky/mm | |
| parent | 1152cb5a9a84c273e666a59ed8308ef15b7d00f3 (diff) | |
| download | linux-stable-78bfa70b16e6db0144a27a10a57348ab967738b6.tar.gz linux-stable-78bfa70b16e6db0144a27a10a57348ab967738b6.tar.bz2 linux-stable-78bfa70b16e6db0144a27a10a57348ab967738b6.zip | |
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.c | 23 |
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; |