Commit 849f5169 authored Aug 15, 2014 by Tejun Heo

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 <tj@kernel.org>
Cc: stable@vger.kernel.org

parent f0d27965

mm/percpu-vm.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}

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