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mm: directly use __mlock_vma_pages_range() in find_extend_vma()

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In find_extend_vma(), we don't need mlock_vma_pages_range() to verify
the vma type - we know we're working with a stack.  So, we can call
directly into __mlock_vma_pages_range(), and remove the last
make_pages_present() call site.

Note that we don't use mm_populate() here, so we can't release the
mmap_sem while allocating new stack pages.  This is deemed acceptable,
because the stack vmas grow by a bounded number of pages at a time, and
these are anon pages so we don't have to read from disk to populate
them.

Signed-off-by: Michel Lespinasse <walken@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Tested-by: Andy Lutomirski <luto@amacapital.net>
Cc: Greg Ungerer <gregungerer@westnet.com.au>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michel Lespinasse
2013-02-22 16:32:44 -08:00
committed by Linus Torvalds
parent c22c0d6344
commit cea10a19b7
5 changed files with 9 additions and 87 deletions
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10
mm/mmap.c
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@@ -2204,9 +2204,8 @@ find_extend_vma(struct mm_struct *mm, unsigned long addr)
return vma;
if (!prev || expand_stack(prev, addr))
return NULL;
if (prev->vm_flags & VM_LOCKED) {
mlock_vma_pages_range(prev, addr, prev->vm_end);
}
if (prev->vm_flags & VM_LOCKED)
__mlock_vma_pages_range(prev, addr, prev->vm_end, NULL);
return prev;
}
#else
@@ -2232,9 +2231,8 @@ find_extend_vma(struct mm_struct * mm, unsigned long addr)
start = vma->vm_start;
if (expand_stack(vma, addr))
return NULL;
if (vma->vm_flags & VM_LOCKED) {
mlock_vma_pages_range(vma, addr, start);
}
if (vma->vm_flags & VM_LOCKED)
__mlock_vma_pages_range(vma, addr, start, NULL);
return vma;
}
#endif