Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161591Ab3DEL60 (ORCPT ); Fri, 5 Apr 2013 07:58:26 -0400 Received: from mga11.intel.com ([192.55.52.93]:14854 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161483Ab3DEL6U (ORCPT ); Fri, 5 Apr 2013 07:58:20 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.87,414,1363158000"; d="scan'208";a="317363658" From: "Kirill A. Shutemov" To: Andrea Arcangeli , Andrew Morton Cc: Al Viro , Hugh Dickins , Wu Fengguang , Jan Kara , Mel Gorman , linux-mm@kvack.org, Andi Kleen , Matthew Wilcox , "Kirill A. Shutemov" , Hillf Danton , Dave Hansen , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [PATCHv3, RFC 08/34] thp, mm: introduce mapping_can_have_hugepages() predicate Date: Fri, 5 Apr 2013 14:59:32 +0300 Message-Id: <1365163198-29726-9-git-send-email-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1365163198-29726-1-git-send-email-kirill.shutemov@linux.intel.com> References: <1365163198-29726-1-git-send-email-kirill.shutemov@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1251 Lines: 40 From: "Kirill A. Shutemov" Returns true if mapping can have huge pages. Just check for __GFP_COMP in gfp mask of the mapping for now. Signed-off-by: Kirill A. Shutemov --- include/linux/pagemap.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index e3dea75..56debde 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -84,6 +84,17 @@ static inline void mapping_set_gfp_mask(struct address_space *m, gfp_t mask) (__force unsigned long)mask; } +static inline bool mapping_can_have_hugepages(struct address_space *m) +{ + if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) { + gfp_t gfp_mask = mapping_gfp_mask(m); + /* __GFP_COMP is key part of GFP_TRANSHUGE */ + return !!(gfp_mask & __GFP_COMP); + } + + return false; +} + /* * The page cache can done in larger chunks than * one page, because it allows for more efficient -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/