From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl0-f72.google.com (mail-pl0-f72.google.com [209.85.160.72]) by kanga.kvack.org (Postfix) with ESMTP id B3F376B0679 for ; Fri, 18 May 2018 15:46:55 -0400 (EDT) Received: by mail-pl0-f72.google.com with SMTP id x32-v6so5612506pld.16 for ; Fri, 18 May 2018 12:46:55 -0700 (PDT) Received: from bombadil.infradead.org (bombadil.infradead.org. [2607:7c80:54:e::133]) by mx.google.com with ESMTPS id l11-v6si5170602pgp.426.2018.05.18.12.45.24 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 18 May 2018 12:45:24 -0700 (PDT) From: Matthew Wilcox Subject: [PATCH v6 12/17] mm: Add pt_mm to struct page Date: Fri, 18 May 2018 12:45:14 -0700 Message-Id: <20180518194519.3820-13-willy@infradead.org> In-Reply-To: <20180518194519.3820-1-willy@infradead.org> References: <20180518194519.3820-1-willy@infradead.org> Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org Cc: Matthew Wilcox , Andrew Morton , "Kirill A . Shutemov" , Christoph Lameter , Lai Jiangshan , Pekka Enberg , Vlastimil Babka , Dave Hansen , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= From: Matthew Wilcox For pgd page table pages, x86 overloads the page->index field to store a pointer to the mm_struct. Rename this to pt_mm so it's visible to other users. Signed-off-by: Matthew Wilcox Acked-by: Vlastimil Babka --- arch/x86/mm/pgtable.c | 5 ++--- include/linux/mm_types.h | 2 +- 2 files changed, 3 insertions(+), 4 deletions(-) diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c index ffc8c13c50e4..938dbcd46b97 100644 --- a/arch/x86/mm/pgtable.c +++ b/arch/x86/mm/pgtable.c @@ -114,13 +114,12 @@ static inline void pgd_list_del(pgd_t *pgd) static void pgd_set_mm(pgd_t *pgd, struct mm_struct *mm) { - BUILD_BUG_ON(sizeof(virt_to_page(pgd)->index) < sizeof(mm)); - virt_to_page(pgd)->index = (pgoff_t)mm; + virt_to_page(pgd)->pt_mm = mm; } struct mm_struct *pgd_page_get_mm(struct page *page) { - return (struct mm_struct *)page->index; + return page->pt_mm; } static void pgd_ctor(struct mm_struct *mm, pgd_t *pgd) diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 90a6dbeeef11..7eb7092424b7 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -139,7 +139,7 @@ struct page { unsigned long _pt_pad_1; /* compound_head */ pgtable_t pmd_huge_pte; /* protected by page->ptl */ unsigned long _pt_pad_2; /* mapping */ - unsigned long _pt_pad_3; + struct mm_struct *pt_mm; /* x86 pgds only */ #if ALLOC_SPLIT_PTLOCKS spinlock_t *ptl; #else -- 2.17.0