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| author | Michel Lespinasse <walken@google.com> | 2013-02-22 16:32:40 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-23 17:50:11 -0800 |
| commit | 128557ffe147c282d8a25e6faeaec6099540bea4 (patch) | |
| tree | b3a0ce0540dd51f634f7ba9f7f7bf16576dce2cb | |
| parent | a1ea9549a7254b17ba85809f4a0200abc21453a2 (diff) | |
| download | linux-stable-128557ffe147c282d8a25e6faeaec6099540bea4.tar.gz linux-stable-128557ffe147c282d8a25e6faeaec6099540bea4.tar.bz2 linux-stable-128557ffe147c282d8a25e6faeaec6099540bea4.zip | |
mm: use mm_populate() when adjusting brk with MCL_FUTURE in effect
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>
| -rw-r--r-- | mm/mmap.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 9b12e3047a86..a23e30f9719c 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -256,6 +256,7 @@ SYSCALL_DEFINE1(brk, unsigned long, brk) unsigned long newbrk, oldbrk; struct mm_struct *mm = current->mm; unsigned long min_brk; + bool populate; down_write(&mm->mmap_sem); @@ -305,8 +306,15 @@ SYSCALL_DEFINE1(brk, unsigned long, brk) /* Ok, looks good - let it rip. */ if (do_brk(oldbrk, newbrk-oldbrk) != oldbrk) goto out; + set_brk: mm->brk = brk; + populate = newbrk > oldbrk && (mm->def_flags & VM_LOCKED) != 0; + up_write(&mm->mmap_sem); + if (populate) + mm_populate(oldbrk, newbrk - oldbrk); + return brk; + out: retval = mm->brk; up_write(&mm->mmap_sem); @@ -2600,10 +2608,8 @@ static unsigned long do_brk(unsigned long addr, unsigned long len) out: perf_event_mmap(vma); mm->total_vm += len >> PAGE_SHIFT; - if (flags & VM_LOCKED) { - if (!mlock_vma_pages_range(vma, addr, addr + len)) - mm->locked_vm += (len >> PAGE_SHIFT); - } + if (flags & VM_LOCKED) + mm->locked_vm += (len >> PAGE_SHIFT); return addr; } @@ -2611,10 +2617,14 @@ unsigned long vm_brk(unsigned long addr, unsigned long len) { struct mm_struct *mm = current->mm; unsigned long ret; + bool populate; down_write(&mm->mmap_sem); ret = do_brk(addr, len); + populate = ((mm->def_flags & VM_LOCKED) != 0); up_write(&mm->mmap_sem); + if (populate) + mm_populate(addr, len); return ret; } EXPORT_SYMBOL(vm_brk); |