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>
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@ -333,6 +333,12 @@ void __init free_early_partial(u64 start, u64 end)
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struct early_res *r;
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struct early_res *r;
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int i;
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int i;
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if (start == end)
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return;
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if (WARN_ONCE(start > end, " wrong range [%#llx, %#llx]\n", start, end))
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return;
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try_next:
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try_next:
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i = find_overlapped_early(start, end);
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i = find_overlapped_early(start, end);
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if (i >= max_early_res)
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if (i >= max_early_res)
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