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

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Message-Id: <1267818583-5627-1-git-send-email-ian.campbell@citrix.com>
Date:	Fri,  5 Mar 2010 19:49:43 +0000
From:	Ian Campbell <ian.campbell@...rix.com>
To:	linux-kernel@...r.kernel.org
Cc:	Ian Campbell <ian.campbell@...rix.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: [PATCH] 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.

Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
Cc: Yinghai Lu <yinghai@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/setup_percpu.c |    3 ++-
 kernel/early_res.c             |    5 +++++
 2 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index ef6370b..89a3205 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -140,7 +140,8 @@ static void __init pcpu_fc_free(void *ptr, size_t size)
 #ifdef CONFIG_NO_BOOTMEM
 	u64 start = __pa(ptr);
 	u64 end = start + size;
-	free_early_partial(start, end);
+	if (start < end)
+		free_early_partial(start, end);
 #else
 	free_bootmem(__pa(ptr), size);
 #endif
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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