diff options
| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2023-07-24 19:54:06 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-08-18 10:12:52 -0700 |
| commit | 0c2e394ab23017303f676e6206a54c54bb0e3681 (patch) | |
| tree | b7816855516327d657607d99a4fc656444bcdc6c /mm/memory.c | |
| parent | 8f5fd0e1a02020062c52063f15d4e5c426ee3547 (diff) | |
| download | linux-0c2e394ab23017303f676e6206a54c54bb0e3681.tar.gz | |
mm: move FAULT_FLAG_VMA_LOCK check down in handle_pte_fault()
Call do_pte_missing() under the VMA lock ... then immediately retry in
do_fault().
Link: https://lkml.kernel.org/r/20230724185410.1124082-7-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Cc: Arjun Roy <arjunroy@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Punit Agrawal <punit.agrawal@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/memory.c')
| -rw-r--r-- | mm/memory.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/mm/memory.c b/mm/memory.c index 932fc62865368..d947d8d9e8911 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4647,6 +4647,11 @@ static vm_fault_t do_fault(struct vm_fault *vmf) struct mm_struct *vm_mm = vma->vm_mm; vm_fault_t ret; + if (vmf->flags & FAULT_FLAG_VMA_LOCK){ + vma_end_read(vma); + return VM_FAULT_RETRY; + } + /* * The VMA was not fully populated on mmap() or missing VM_DONTEXPAND */ @@ -4932,11 +4937,6 @@ static vm_fault_t handle_pte_fault(struct vm_fault *vmf) { pte_t entry; - if ((vmf->flags & FAULT_FLAG_VMA_LOCK) && !vma_is_anonymous(vmf->vma)) { - vma_end_read(vmf->vma); - return VM_FAULT_RETRY; - } - if (unlikely(pmd_none(*vmf->pmd))) { /* * Leave __pte_alloc() until later: because vm_ops->fault may @@ -4969,6 +4969,12 @@ static vm_fault_t handle_pte_fault(struct vm_fault *vmf) if (!vmf->pte) return do_pte_missing(vmf); + if ((vmf->flags & FAULT_FLAG_VMA_LOCK) && !vma_is_anonymous(vmf->vma)) { + pte_unmap(vmf->pte); + vma_end_read(vmf->vma); + return VM_FAULT_RETRY; + } + if (!pte_present(vmf->orig_pte)) return do_swap_page(vmf); |