Commit-ID: eed63519e3e74d515d2007ecd895338d0ba2a85c
Gitweb: http://git.kernel.org/tip/eed63519e3e74d515d2007ecd895338d0ba2a85c
Author: Ian Campbell <ian.campbell@xxxxxxxxxx>
AuthorDate: Sun, 28 Mar 2010 19:42:56 -0700
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Mon, 29 Mar 2010 18:55:40 +0200
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@xxxxxxxxxx>
Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Tested-by: Joel Becker <joel.becker@xxxxxxxxxx>
Tested-by: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: David Miller <davem@xxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
LKML-Reference: <1269830604-26214-4-git-send-email-yinghai@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
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 3cb2c66..31aa933 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)
--
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