Commit 002ea9ee authored Sep 29, 2011 by Linus Walleij Committed by Russell King Oct 01, 2011

ARM: 7113/1: mm: Align bank start to MAX_ORDER_NR_PAGES



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: stable@kernel.org
Cc: Michael Bohan <mbohan@codeaurora.org>
Cc: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Johan Palsson <johan.palsson@stericsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

parent 47ea91b4

arch/arm/mm/init.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -496,6 +496,13 @@ static void __init free_unused_memmap(struct meminfo *mi)
		*/
		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