From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl0-f69.google.com (mail-pl0-f69.google.com [209.85.160.69]) by kanga.kvack.org (Postfix) with ESMTP id 27CBC6B0009 for ; Wed, 28 Feb 2018 17:32:12 -0500 (EST) Received: by mail-pl0-f69.google.com with SMTP id h61-v6so2165833pld.3 for ; Wed, 28 Feb 2018 14:32:12 -0800 (PST) Received: from bombadil.infradead.org (bombadil.infradead.org. [2607:7c80:54:e::133]) by mx.google.com with ESMTPS id j71si1555183pgd.404.2018.02.28.14.32.09 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 28 Feb 2018 14:32:09 -0800 (PST) From: Matthew Wilcox Subject: [PATCH v3 4/4] mm: Mark pages in use for page tables Date: Wed, 28 Feb 2018 14:31:57 -0800 Message-Id: <20180228223157.9281-5-willy@infradead.org> In-Reply-To: <20180228223157.9281-1-willy@infradead.org> References: <20180228223157.9281-1-willy@infradead.org> Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org Cc: Matthew Wilcox , Martin Schwidefsky , linux-kernel@vger.kernel.org From: Matthew Wilcox Define a new PageTable bit in the page_type and use it to mark pages in use as page tables. Signed-off-by: Matthew Wilcox --- include/linux/mm.h | 2 ++ include/linux/page-flags.h | 6 ++++++ 2 files changed, 8 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index ad06d42adb1a..7a15042d6828 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1829,6 +1829,7 @@ static inline bool pgtable_page_ctor(struct page *page) { if (!ptlock_init(page)) return false; + __SetPageTable(page); inc_zone_page_state(page, NR_PAGETABLE); return true; } @@ -1836,6 +1837,7 @@ static inline bool pgtable_page_ctor(struct page *page) static inline void pgtable_page_dtor(struct page *page) { pte_lock_deinit(page); + __ClearPageTable(page); dec_zone_page_state(page, NR_PAGETABLE); } diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 8142ab716e90..ac6bab90849c 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -644,6 +644,7 @@ PAGEFLAG_FALSE(DoubleMap) #define PG_balloon 0x00000100 #define PG_kmemcg 0x00000200 #define PG_vmalloc 0x00000400 +#define PG_table 0x00000800 #define PageType(page, flag) \ ((page->page_type & (PAGE_TYPE_BASE | flag)) == PAGE_TYPE_BASE) @@ -687,6 +688,11 @@ PAGE_TYPE_OPS(Kmemcg, kmemcg) */ PAGE_TYPE_OPS(Vmalloc, vmalloc) +/* + * Marks pages in use as page tables. + */ +PAGE_TYPE_OPS(Table, table) + extern bool is_free_buddy_page(struct page *page); __PAGEFLAG(Isolated, isolated, PF_ANY); -- 2.16.1 -- 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