From 849f5169097e1ba35b90ac9df76b5bb6f9c0aabd Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Fri, 15 Aug 2014 16:06:10 -0400 Subject: percpu: perform tlb flush after pcpu_map_pages() failure 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 Cc: stable@vger.kernel.org --- mm/percpu-vm.c | 1 + 1 file changed, 1 insertion(+) (limited to 'mm/percpu-vm.c') 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; } -- cgit v1.2.3