linux-kernel - [PATCH] memblock: Add limit checking to memblock_virt

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Date:	Tue, 28 Jan 2014 14:04:25 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	"'Russell King - ARM Linux'" <linux@....linux.org.uk>,
	Kevin Hilman <khilman@...aro.org>,
	Olof Johansson <olof@...om.net>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	Dave Hansen <dave.hansen@...el.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH] memblock: Add limit checking to memblock_virt_alloc

In original bootmem wrapper for memblock, we have limit checking.

Add it to memblock_virt_alloc, to address arm and x86 booting crash.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 mm/memblock.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-2.6/mm/memblock.c
===================================================================
--- linux-2.6.orig/mm/memblock.c
+++ linux-2.6/mm/memblock.c
@@ -1077,6 +1077,9 @@ static void * __init memblock_virt_alloc
 	if (!align)
 		align = SMP_CACHE_BYTES;
 
+	if (max_addr > memblock.current_limit)
+		max_addr = memblock.current_limit;
+
 again:
 	alloc = memblock_find_in_range_node(size, align, min_addr, max_addr,
 					    nid);
--
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