linux-kernel - [PATCH 03/31] x86: Do not free zero sized per cpu areas

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Date:	Sun, 28 Mar 2010 19:42:56 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Johannes Weiner <hannes@...xchg.org>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, Ian Campbell <ian.campbell@...rix.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: [PATCH 03/31] 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.

-v5: put back start > end back into WARN_ONCE()
-v6: use one line for warning according to linus
-v7: more test by
-v8: remove the function name according to Johannes
     WARN_ONCE will print that function name.

Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Tested-by: Joel Becker <joel.becker@...cle.com>
Tested-by: Stanislaw Gruszka <sgruszka@...hat.com>
Acked-by: Johannes Weiner <hannes@...xchg.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...e.hu>
---
 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)
-- 
1.6.4.2

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