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authorTejun Heo <tj@kernel.org>2014-08-15 16:06:10 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-10-05 14:54:13 -0700
commit9afaddd9781bb8a856d6cb48cf404e5f3d59b6de (patch)
tree8ad07fe3faa960e3e972e5c476d289d830f1ecc3
parent5df644fd609cd0610a77dd13eed9729bd2eefbd5 (diff)
downloadlinux-linaro-stable-9afaddd9781bb8a856d6cb48cf404e5f3d59b6de.tar.gz
percpu: perform tlb flush after pcpu_map_pages() failure
commit 849f5169097e1ba35b90ac9df76b5bb6f9c0aabd upstream. If pcpu_map_pages() fails midway, it unmaps the already mapped pages. Currently, it doesn't flush tlb after the partial unmapping. This may be okay in most cases as the established mapping hasn't been used at that point but it can go wrong and when it goes wrong it'd be extremely difficult to track down. Flush tlb after the partial unmapping. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--mm/percpu-vm.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/percpu-vm.c b/mm/percpu-vm.c
index 8d9bb2c00c68..51108165f829 100644
--- a/mm/percpu-vm.c
+++ b/mm/percpu-vm.c
@@ -272,6 +272,7 @@ err:
__pcpu_unmap_pages(pcpu_chunk_addr(chunk, tcpu, page_start),
page_end - page_start);
}
+ pcpu_post_unmap_tlb_flush(chunk, page_start, page_end);
return err;
}