linux-kernel - Re: [Bug 11046] New: Kernel bug in mm/bootmem.c on Sparc machines

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Message-Id: <20080723.204247.114065226.davem@davemloft.net>
Date:	Wed, 23 Jul 2008 20:42:47 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	akpm@...ux-foundation.org
Cc:	sparclinux@...r.kernel.org, bugme-daemon@...zilla.kernel.org,
	lomp0101@....net, linux-kernel@...r.kernel.org, hannes@...urebad.de
Subject: Re: [Bug 11046] New: Kernel bug in mm/bootmem.c on Sparc machines

From: Andrew Morton <akpm@...ux-foundation.org>
Date: Wed, 23 Jul 2008 20:38:36 -0700

> So if we're going to change it in 2.6.26, we'll need a separate patch.

Here is the 2.6.26 version:

bootmem: Allow zero length reserve and free.

It's either this or all the call sites explicitly check
when such a case is possible and sometimes expected.

Signed-off-by: David S. Miller <davem@...emloft.net>

diff --git a/mm/bootmem.c b/mm/bootmem.c
index 8d9f60e..e540f7a 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -153,7 +153,8 @@ static void __init reserve_bootmem_core(bootmem_data_t *bdata,
 	unsigned long sidx, eidx;
 	unsigned long i;
 
-	BUG_ON(!size);
+	if (!size)
+		return;
 
 	/* out of range */
 	if (addr + size < bdata->node_boot_start ||
@@ -187,7 +188,8 @@ static void __init free_bootmem_core(bootmem_data_t *bdata, unsigned long addr,
 	unsigned long sidx, eidx;
 	unsigned long i;
 
-	BUG_ON(!size);
+	if (!size)
+		return;
 
 	/* out range */
 	if (addr + size < bdata->node_boot_start ||
--
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