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Message-Id: <20141003212919.144625832@linuxfoundation.org> Date: Fri, 3 Oct 2014 14:31:26 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Tejun Heo <tj@...nel.org> Subject: [PATCH 3.14 171/238] percpu: perform tlb flush after pcpu_map_pages() failure 3.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tejun Heo <tj@...nel.org> 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@...nel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- mm/percpu-vm.c | 1 + 1 file changed, 1 insertion(+) --- 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; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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