From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f178.google.com (mail-pd0-f178.google.com [209.85.192.178]) by kanga.kvack.org (Postfix) with ESMTP id EA4A56B0074 for ; Fri, 6 Feb 2015 09:51:27 -0500 (EST) Received: by pdbfp1 with SMTP id fp1so15163694pdb.2 for ; Fri, 06 Feb 2015 06:51:27 -0800 (PST) Received: from mga01.intel.com (mga01.intel.com. [192.55.52.88]) by mx.google.com with ESMTP id fh3si10492894pbb.187.2015.02.06.06.51.17 for ; Fri, 06 Feb 2015 06:51:17 -0800 (PST) From: "Kirill A. Shutemov" Subject: [PATCHv2, RESEND 09/19] mn10300: mark PUD and PMD folded Date: Fri, 6 Feb 2015 16:50:54 +0200 Message-Id: <1423234264-197684-10-git-send-email-kirill.shutemov@linux.intel.com> In-Reply-To: <1423234264-197684-1-git-send-email-kirill.shutemov@linux.intel.com> References: <1423234264-197684-1-git-send-email-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" , David Howells , Koichi Yasutake Core mm expects __PAGETABLE_{PUD,PMD}_FOLDED to be defined if these page table levels folded. Signed-off-by: Kirill A. Shutemov Cc: David Howells Cc: Koichi Yasutake Tested-by: Guenter Roeck --- I've implemented accounting for pmd page tables as we have for pte (see mm->nr_ptes). It's requires a new counter in mm_struct: mm->nr_pmds. But the feature doesn't make any sense if an architecture has PMD level folded and it would be nice get rid of the counter in this case. The problem is that we cannot use __PAGETABLE_PMD_FOLDED in due to circular dependencies: -> -> In most cases wants to get definition of struct page and struct vm_area_struct. I've tried to split mm_struct into separate header file to be able to user there. But it doesn't fly on some architectures, like ARM: it wants mm_struct to implement tlb flushing. I don't see how to fix it without massive de-inlining or coverting a lot for inline functions to macros. This is other approach: expose number of page tables in use via Kconfig and use it in instead of __PAGETABLE_PMD_FOLDED from . --- arch/mn10300/include/asm/pgtable.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/mn10300/include/asm/pgtable.h b/arch/mn10300/include/asm/pgtable.h index afab728ab65e..96d3f9deb59c 100644 --- a/arch/mn10300/include/asm/pgtable.h +++ b/arch/mn10300/include/asm/pgtable.h @@ -56,7 +56,9 @@ extern void paging_init(void); #define PGDIR_SHIFT 22 #define PTRS_PER_PGD 1024 #define PTRS_PER_PUD 1 /* we don't really have any PUD physically */ +#define __PAGETABLE_PUD_FOLDED #define PTRS_PER_PMD 1 /* we don't really have any PMD physically */ +#define __PAGETABLE_PMD_FOLDED #define PTRS_PER_PTE 1024 #define PGD_SIZE PAGE_SIZE -- 2.1.4 -- 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