From mboxrd@z Thu Jan 1 00:00:00 1970 From: kirill.shutemov@linux.intel.com (Kirill A. Shutemov) Date: Tue, 20 Jan 2015 16:05:46 +0200 (EET) Subject: [next-20150119]regression (mm)? In-Reply-To: <20150120114555.GA11502@n2100.arm.linux.org.uk> References: <54BD33DC.40200@ti.com> <20150119174317.GK20386@saruman> <20150120001643.7D15AA8@black.fi.intel.com> <20150120114555.GA11502@n2100.arm.linux.org.uk> Message-ID: <20150120140546.DDCB8D4@black.fi.intel.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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(+) diff --git a/arch/arm/include/asm/pgtable-2level.h b/arch/arm/include/asm/pgtable-2level.h index bcc5e300413f..bfd662e49a25 100644 --- a/arch/arm/include/asm/pgtable-2level.h +++ b/arch/arm/include/asm/pgtable-2level.h @@ -10,6 +10,8 @@ #ifndef _ASM_PGTABLE_2LEVEL_H #define _ASM_PGTABLE_2LEVEL_H +#define __PAGETABLE_PMD_FOLDED + /* * Hardware-wise, we have a two level page table structure, where the first * level has 4096 entries, and the second level has 256 entries. Each entry -- 2.1.4