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 > > <asm-generic/pgtable-nopmd.h>, 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" <kirill.shutemov@xxxxxxxxxxxxxxx> 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 <kirill.shutemov@xxxxxxxxxxxxxxx> Reported-by: Nishanth Menon <nm@xxxxxx> --- 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>