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authorLinus Torvalds <torvalds@linux-foundation.org>2012-04-20 15:35:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-04-20 17:28:17 -0700
commite4eb1ff61b323d6141614e5458a1f53c7046ff8e (patch)
tree7a0251509c169b0df1a6bf4bc47c5bca709e06da /mm/mmap.c
parent3b422e9c2c020a1137349c614da7f9c9761a0922 (diff)
downloadlwn-e4eb1ff61b323d6141614e5458a1f53c7046ff8e.tar.gz
lwn-e4eb1ff61b323d6141614e5458a1f53c7046ff8e.zip
VM: add "vm_brk()" helper function
It does the same thing as "do_brk()", except it handles the VM locking too. It turns out that all external callers want that anyway, so we can make do_brk() static to just mm/mmap.c while at it. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mmap.c')
-rw-r--r--mm/mmap.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index a7bf6a31c9f6..df51891c8646 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -240,6 +240,8 @@ static struct vm_area_struct *remove_vma(struct vm_area_struct *vma)
return next;
}
+static unsigned long do_brk(unsigned long addr, unsigned long len);
+
SYSCALL_DEFINE1(brk, unsigned long, brk)
{
unsigned long rlim, retval;
@@ -2136,7 +2138,7 @@ static inline void verify_mm_writelocked(struct mm_struct *mm)
* anonymous maps. eventually we may be able to do some
* brk-specific accounting here.
*/
-unsigned long do_brk(unsigned long addr, unsigned long len)
+static unsigned long do_brk(unsigned long addr, unsigned long len)
{
struct mm_struct * mm = current->mm;
struct vm_area_struct * vma, * prev;
@@ -2232,7 +2234,17 @@ out:
return addr;
}
-EXPORT_SYMBOL(do_brk);
+unsigned long vm_brk(unsigned long addr, unsigned long len)
+{
+ struct mm_struct *mm = current->mm;
+ unsigned long ret;
+
+ down_write(&mm->mmap_sem);
+ ret = do_brk(addr, len);
+ up_write(&mm->mmap_sem);
+ return ret;
+}
+EXPORT_SYMBOL(vm_brk);
/* Release all mmaps. */
void exit_mmap(struct mm_struct *mm)