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authorAdam Litke <agl@us.ibm.com>2007-06-16 10:16:15 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-16 13:16:16 -0700
commit22741925d268e8479ef66312749bd8d96ed35365 (patch)
tree33d6ed9143d4e65a1fa8f2bc75b2b41ea4fe3b0e
parent74584ae509befc2ed711810e7df4b075473869b2 (diff)
downloadlinux-22741925d268e8479ef66312749bd8d96ed35365.tar.gz
hugetlb: fix get_policy for stacked shared memory files
Here's another breakage as a result of shared memory stacked files :( The NUMA policy for a VMA is determined by checking the following (in the order given): 1) vma->vm_ops->get_policy() (if defined) 2) vma->vm_policy (if defined) 3) task->mempolicy (if defined) 4) Fall back to default_policy By switching to stacked files for shared memory, get_policy() is now always set to shm_get_policy which is a wrapper function. This causes us to stop at step 1, which yields NULL for hugetlb instead of task->mempolicy which was the previous (and correct) result. This patch modifies the shm_get_policy() wrapper to maintain steps 1-3 for the wrapped vm_ops. (akpm: the refcounting of mempolicies is busted and this patch does nothing to improve it) Signed-off-by: Adam Litke <agl@us.ibm.com> Acked-by: William Irwin <bill.irwin@oracle.com> Cc: dean gaudet <dean@arctic.org> Cc: Christoph Lameter <clameter@sgi.com> Cc: Andi Kleen <ak@suse.de> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--ipc/shm.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/ipc/shm.c b/ipc/shm.c
index 02faa54dbf5..047b823e6bf 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -254,8 +254,10 @@ struct mempolicy *shm_get_policy(struct vm_area_struct *vma, unsigned long addr)
if (sfd->vm_ops->get_policy)
pol = sfd->vm_ops->get_policy(vma, addr);
- else
+ else if (vma->vm_policy)
pol = vma->vm_policy;
+ else
+ pol = current->mempolicy;
return pol;
}
#endif