From mboxrd@z Thu Jan 1 00:00:00 1970 From: linus.walleij@linaro.org (Linus Walleij) Date: Thu, 29 Sep 2011 10:36:10 +0200 Subject: [PATCH v2] ARM: mm: Align bank start to MAX_ORDER_NR_PAGES Message-ID: <1317285370-11792-1-git-send-email-linus.walleij@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Johan Palsson 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 at kernel.org Cc: Russell King Cc: Michael Bohan Cc: Nicolas Pitre Signed-off-by: Johan Palsson Signed-off-by: Rabin Vincent Signed-off-by: Linus Walleij --- arch/arm/mm/init.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c index cc7e2d8..f8037ba 100644 --- a/arch/arm/mm/init.c +++ b/arch/arm/mm/init.c @@ -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 -- 1.7.6.2