linux-kernel - [01/27] ARM: 7113/1: mm: Align bank start to MAX_ORDER_NR

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Date:	Sun, 23 Oct 2011 08:24:29 +0200
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	stable-review@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Michael Bohan <mbohan@...eaurora.org>,
	Nicolas Pitre <nico@...xnic.net>,
	Johan Palsson <johan.palsson@...ricsson.com>,
	Rabin Vincent <rabin.vincent@...ricsson.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: [01/27] ARM: 7113/1: mm: Align bank start to MAX_ORDER_NR_PAGES

3.0-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Linus Walleij <linus.walleij@...aro.org>

commit 002ea9eefec98dada56fd5f8e432a4e8570c2a26 upstream.

The VM subsystem assumes that there are valid memmap entries from
the bank start aligned to MAX_ORDER_NR_PAGES.

On the Ux500 we have a lot of mem=N arguments on the commandline
triggering this bug several times over and causing kernel
oops messages.

Cc: Michael Bohan <mbohan@...eaurora.org>
Cc: Nicolas Pitre <nico@...xnic.net>
Signed-off-by: Johan Palsson <johan.palsson@...ricsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent@...ricsson.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/arm/mm/init.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -473,6 +473,13 @@ static void __init free_unused_memmap(st
 		 */
 		bank_start = min(bank_start,
 				 ALIGN(prev_bank_end, PAGES_PER_SECTION));
+#else
+		/*
+		 * Align down here since the VM subsystem insists that the
+		 * memmap entries are valid from the bank start aligned to
+		 * MAX_ORDER_NR_PAGES.
+		 */
+		bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
 #endif
 		/*
 		 * If we had a previous bank, and there is a space


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