2015-01-20 15:05 GMT+01:00 Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>: > 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(+) Helps for this issue on Exynos 4412 (Trats2) and Exynos 5420 (Arndale Octa): Tested-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx> 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@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>