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FROMGIT: mm: move FAULT_FLAG_VMA_LOCK check down from do_fault()

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Perform the check at the start of do_read_fault(), do_cow_fault() and
do_shared_fault() instead.  Should be no performance change from the last
commit.

Link: https://lkml.kernel.org/r/20230724185410.1124082-8-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>

(cherry picked from commit 4e105ec567c874c166a8e5a9b2dd849c8ec2055e
https: //git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable)

Bug: 293665307
Change-Id: I37be370a0378afd094d880bb8e538e4e7874499e
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-07-24 19:54:07 +01:00 committed by Suren Baghdasaryan
parent fa9a8adff0
commit 072c35fb69
1 changed files with 15 additions and 5 deletions
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20
mm/memory.c
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@ -4585,6 +4585,11 @@ static vm_fault_t do_read_fault(struct vm_fault *vmf)
{
vm_fault_t ret = 0;
if (vmf->flags & FAULT_FLAG_VMA_LOCK) {
vma_end_read(vmf->vma);
return VM_FAULT_RETRY;
}
/*
* Let's call ->map_pages() first and use ->fault() as fallback
* if page by the offset is not ready to be mapped (cold cache or
@ -4612,6 +4617,11 @@ static vm_fault_t do_cow_fault(struct vm_fault *vmf)
struct vm_area_struct *vma = vmf->vma;
vm_fault_t ret;
if (vmf->flags & FAULT_FLAG_VMA_LOCK) {
vma_end_read(vma);
return VM_FAULT_RETRY;
}
if (unlikely(anon_vma_prepare(vma)))
return VM_FAULT_OOM;
@ -4651,6 +4661,11 @@ static vm_fault_t do_shared_fault(struct vm_fault *vmf)
struct vm_area_struct *vma = vmf->vma;
vm_fault_t ret, tmp;
if (vmf->flags & FAULT_FLAG_VMA_LOCK) {
vma_end_read(vma);
return VM_FAULT_RETRY;
}
ret = __do_fault(vmf);
if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)))
return ret;
@ -4695,11 +4710,6 @@ 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
*/