Doug / smarc-fsl-linux-kernel

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Commit eed63519e3e74d515d2007ecd895338d0ba2a85c

Authored by Ian Campbell
Committed by Ingo Molnar
1 parent c967da6a0b
Exists in master and in 7 other branches imx_3.0.35_4.1.0, imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-l5.0.0_1.0.0-ga

x86: Do not free zero sized per cpu areas 

This avoids an infinite loop in free_early_partial().

Add a warning to free_early_partial() to catch future problems.

-v5: put back start > end back into WARN_ONCE()
-v6: use one line for warning, suggested by Linus
-v7: more tests
-v8: remove the function name as suggested by Johannes
     WARN_ONCE() will print out that function name.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Joel Becker <joel.becker@oracle.com>
Tested-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: David Miller <davem@davemloft.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <1269830604-26214-4-git-send-email-yinghai@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

Showing 1 changed file with 6 additions and 0 deletions Side-by-side Diff

... ... @@ -333,6 +333,12 @@
333 333 struct early_res *r;
334 334 int i;
335 335  
  336 + if (start == end)
  337 + return;
  338 +
  339 + if (WARN_ONCE(start > end, " wrong range [%#llx, %#llx]\n", start, end))
  340 + return;
  341 +
336 342 try_next:
337 343 i = find_overlapped_early(start, end);
338 344 if (i >= max_early_res)