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authorMichel Lespinasse <walken@google.com>2013-02-22 16:32:44 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-23 17:50:11 -0800
commitcea10a19b7972a1954c4a2d05a7de8db48b444fb (patch)
tree694b3c906259cfbfc7b7cb1b0eb507ecf0d1d63c /mm/memory.c
parentc22c0d6344c362b1dde5d8e160d3d07536aca120 (diff)
downloadlinux-cea10a19b7972a1954c4a2d05a7de8db48b444fb.tar.gz
mm: directly use __mlock_vma_pages_range() in find_extend_vma()
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>
Diffstat (limited to 'mm/memory.c')
-rw-r--r--mm/memory.c24
1 files changed, 0 insertions, 24 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 0abd07097ec..7837ceacf09 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3824,30 +3824,6 @@ int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address)
}
#endif /* __PAGETABLE_PMD_FOLDED */
-int make_pages_present(unsigned long addr, unsigned long end)
-{
- int ret, len, write;
- struct vm_area_struct * vma;
-
- vma = find_vma(current->mm, addr);
- if (!vma)
- return -ENOMEM;
- /*
- * We want to touch writable mappings with a write fault in order
- * to break COW, except for shared mappings because these don't COW
- * and we would not want to dirty them for nothing.
- */
- write = (vma->vm_flags & (VM_WRITE | VM_SHARED)) == VM_WRITE;
- BUG_ON(addr >= end);
- BUG_ON(end > vma->vm_end);
- len = DIV_ROUND_UP(end, PAGE_SIZE) - addr/PAGE_SIZE;
- ret = get_user_pages(current, current->mm, addr,
- len, write, 0, NULL, NULL);
- if (ret < 0)
- return ret;
- return ret == len ? 0 : -EFAULT;
-}
-
#if !defined(__HAVE_ARCH_GATE_AREA)
#if defined(AT_SYSINFO_EHDR)