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| author | Ian Campbell <ian.campbell@citrix.com> | 2010-03-28 19:42:56 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-03-29 18:55:40 +0200 |
| commit | eed63519e3e74d515d2007ecd895338d0ba2a85c (patch) | |
| tree | 4b33f284ab39080293b287316d18745c770058e2 | |
| parent | c967da6a0ba837f762042e931d4afcf72045547c (diff) | |
| download | linux-eed63519e3e74d515d2007ecd895338d0ba2a85c.tar.gz linux-eed63519e3e74d515d2007ecd895338d0ba2a85c.tar.bz2 linux-eed63519e3e74d515d2007ecd895338d0ba2a85c.zip | |
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>
| -rw-r--r-- | kernel/early_res.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/early_res.c b/kernel/early_res.c index 3cb2c661bb78..31aa9332ef3f 100644 --- a/kernel/early_res.c +++ b/kernel/early_res.c @@ -333,6 +333,12 @@ void __init free_early_partial(u64 start, u64 end) struct early_res *r; int i; + if (start == end) + return; + + if (WARN_ONCE(start > end, " wrong range [%#llx, %#llx]\n", start, end)) + return; + try_next: i = find_overlapped_early(start, end); if (i >= max_early_res) |