From mboxrd@z Thu Jan 1 00:00:00 1970 From: Krzysztof Kozlowski Subject: Re: [next-20150119]regression (mm)? Date: Wed, 21 Jan 2015 11:29:11 +0100 Message-ID: References: <54BD33DC.40200@ti.com> <20150119174317.GK20386@saruman> <20150120001643.7D15AA8@black.fi.intel.com> <20150120114555.GA11502@n2100.arm.linux.org.uk> <20150120140546.DDCB8D4@black.fi.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Return-path: In-Reply-To: <20150120140546.DDCB8D4@black.fi.intel.com> Sender: owner-linux-mm@kvack.org To: "Kirill A. Shutemov" Cc: Russell King - ARM Linux , Felipe Balbi , Nishanth Menon , linux-mm@kvack.org, linux-next , linux-omap , "linux-arm-kernel@lists.infradead.org" List-Id: linux-omap@vger.kernel.org 2015-01-20 15:05 GMT+01:00 Kirill A. Shutemov : > Russell King - ARM Linux wrote: >> On Tue, Jan 20, 2015 at 02:16:43AM +0200, Kirill A. Shutemov wrote: >> > Better option would be converting 2-lvl ARM configuration to >> > , but I'm not sure if it's possible. >> >> Well, IMHO the folded approach in asm-generic was done the wrong way >> which barred ARM from ever using it. > > Okay, I see. > > Regarding the topic bug. Completely untested patch is below. Could anybody > check if it helps? > > From 34b9182d08ef2b541829e305fcc91ef1d26b27ea Mon Sep 17 00:00:00 2001 > From: "Kirill A. Shutemov" > Date: Tue, 20 Jan 2015 15:47:22 +0200 > Subject: [PATCH] arm: define __PAGETABLE_PMD_FOLDED for !LPAE > > ARM uses custom implementation of PMD folding in 2-level page table case. > Generic code expects to see __PAGETABLE_PMD_FOLDED to be defined if PMD is > folded, but ARM doesn't do this. Let's fix it. > > Defining __PAGETABLE_PMD_FOLDED will drop out unused __pmd_alloc(). > It also fixes problems with recently-introduced pmd accounting on ARM > without LPAE. > > Signed-off-by: Kirill A. Shutemov > Reported-by: Nishanth Menon > --- > arch/arm/include/asm/pgtable-2level.h | 2 ++ > 1 file changed, 2 insertions(+) Helps for this issue on Exynos 4412 (Trats2) and Exynos 5420 (Arndale Octa): Tested-by: Krzysztof Kozlowski Off-topic: "Using smp_processor_id() in preemptible" still screams [1] [1] https://lkml.org/lkml/2015/1/20/162 Best regards, Krzysztof -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org