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x86: Do not free zero sized per cpu areas

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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>
This commit is contained in:
Ian Campbell 2010-03-28 19:42:56 -07:00 committed by Ingo Molnar
parent c967da6a0b
commit eed63519e3
1 changed files with 6 additions and 0 deletions
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6
kernel/early_res.c
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@ -333,6 +333,12 @@ void __init free_early_partial(u64 start, u64 end)
struct early_res *r; struct early_res *r;
int i; int i;
if (start == end)
return;
if (WARN_ONCE(start > end, " wrong range [%#llx, %#llx]\n", start, end))
return;
try_next: try_next:
i = find_overlapped_early(start, end); i = find_overlapped_early(start, end);
if (i >= max_early_res) if (i >= max_early_res)