[PATCH] mm: fix uninitialized variables for find_vma_prepare callers

gcc 4.3.0 correctly emits the following warnings.
When a vma covering addr is found, find_vma_prepare indeed returns without
setting pprev, rb_link, and rb_parent.

/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c: In function ‘insert_vm_struct’:
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:2085: warning: ‘rb_parent’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:2085: warning: ‘rb_link’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:2084: warning: ‘prev’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c: In function ‘copy_vma’:
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:2124: warning: ‘rb_parent’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:2124: warning: ‘rb_link’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:2123: warning: ‘prev’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c: In function ‘do_brk’:
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:1951: warning: ‘rb_parent’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:1951: warning: ‘rb_link’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:1949: warning: ‘prev’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c: In function ‘mmap_region’:
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:1092: warning: ‘rb_parent’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:1092: warning: ‘rb_link’ may be used uninitialized in this function
/usr0/export/dev/bhalevy/git/linux-pnfs-bh-nfs41/mm/mmap.c:1089: warning: ‘prev’ may be used uninitialized in this function

Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
---
mm/mmap.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 3354fdd..81b9873 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -366,7 +366,7 @@ find_vma_prepare(struct mm_struct *mm, unsigned long addr,
if (vma_tmp->vm_end > addr) {
vma = vma_tmp;
if (vma_tmp->vm_start <= addr)
- return vma;
+ break;
__rb_link = &__rb_parent->rb_left;
} else {
rb_prev = __rb_parent;
--
1.5.6.GIT

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

Quantcast