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authorMichel Lespinasse <walken@google.com>2013-02-23 01:32:40 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-24 02:50:11 +0100
commit128557ffe147c282d8a25e6faeaec6099540bea4 (patch)
treeb3a0ce0540dd51f634f7ba9f7f7bf16576dce2cb
parentmm: use mm_populate() for blocking remap_file_pages() (diff)
downloadlinux-128557ffe147c282d8a25e6faeaec6099540bea4.tar.xz
linux-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.c18
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);