From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935519AbeB1WcZ (ORCPT ); Wed, 28 Feb 2018 17:32:25 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:44522 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935479AbeB1WcL (ORCPT ); Wed, 28 Feb 2018 17:32:11 -0500 From: Matthew Wilcox To: linux-mm@kvack.org Cc: Matthew Wilcox , Martin Schwidefsky , linux-kernel@vger.kernel.org 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> X-Mailer: git-send-email 2.14.3 In-Reply-To: <20180228223157.9281-1-willy@infradead.org> References: <20180228223157.9281-1-willy@infradead.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: 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