linux-kernel - [PATCH -v3] x86: do not free zero sized per cpu areas

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Message-ID: <4BA3F82D.5090807@kernel.org>
Date:	Fri, 19 Mar 2010 15:18:21 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
CC:	linux-kernel@...r.kernel.org,
	Ian Campbell <ian.campbell@...rix.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH -v3] x86: do not free zero sized per cpu areas

From: Ian Campbell <ian.campbell@...rix.com>

This avoids an infinite loop in free_early_partial().

Add a warning to free_early_partial to catch future problems.

-v3: according to hpa, don't bother caller.

Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...e.hu>
---
 kernel/early_res.c             |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/kernel/early_res.c b/kernel/early_res.c
index 3cb2c66..f3a861b 100644
--- a/kernel/early_res.c
+++ b/kernel/early_res.c
@@ -333,6 +333,11 @@ void __init free_early_partial(u64 start, u64 end)
 	struct early_res *r;
 	int i;
 
+	if (WARN_ONCE(start >= end,
+		      "free_early_partial got wrong start/end %#llx/%#llx\n",
+		      start, end))
+		return;
+
 try_next:
 	i = find_overlapped_early(start, end);
 	if (i >= max_early_res)
-- 
1.5.6.5
--
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