diff options
| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2023-10-06 20:53:17 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-10-18 14:34:14 -0700 |
| commit | 12214eba1992642eee5813a9cc9f626e5b2d1815 (patch) | |
| tree | 00167941fc3ea21b4a2c7b6cf0a7b84bade48224 /mm/memory.c | |
| parent | 4de8c93a4751e10737b6af65db42c743228c67a6 (diff) | |
| download | lwn-12214eba1992642eee5813a9cc9f626e5b2d1815.tar.gz lwn-12214eba1992642eee5813a9cc9f626e5b2d1815.zip | |
mm: handle read faults under the VMA lock
Most file-backed faults are already handled through ->map_pages(), but if
we need to do I/O we'll come this way. Since filemap_fault() is now safe
to be called under the VMA lock, we can handle these faults under the VMA
lock now.
Link: https://lkml.kernel.org/r/20231006195318.4087158-6-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/memory.c')
| -rw-r--r-- | mm/memory.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/mm/memory.c b/mm/memory.c index be9469a29413..ada461b82a75 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4617,10 +4617,9 @@ static vm_fault_t do_read_fault(struct vm_fault *vmf) return ret; } - if (vmf->flags & FAULT_FLAG_VMA_LOCK) { - vma_end_read(vmf->vma); - return VM_FAULT_RETRY; - } + ret = vmf_can_call_fault(vmf); + if (ret) + return ret; ret = __do_fault(vmf); if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY))) |