From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 927B2C3DA6E for ; Wed, 10 Jan 2024 09:21:35 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 25FDF10E18B; Wed, 10 Jan 2024 09:21:35 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by gabe.freedesktop.org (Postfix) with ESMTPS id C4E9E10E198; Wed, 10 Jan 2024 09:21:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=vemtm26RZJwq2BkJen0DsgudNpnNIQOHTlEDhkpMTMQ=; b=VvT59FfZyGViQ4E9bybilVlr/n E58xcBMqiG7yHbZRyzY+MeZqOUO73LE+/oyqen6J0wutWRO0UD5OylhJ4Mqx1GoUwrpWkQ9ockMTO zyTTGC4l3K2AVsMneNh/767/v9arpPkmZu6jv9Kpv6xyiCQwY2IKXC2f87wwmXRPgcGR0L6ncNvtJ bRz65LMjl5Yq3e1j5b56u9hCiLVBySWQ/Sr/aid4EvqC/7O7zhvFA590kdpkdOalJHAgkUUs+n+Vw EHaNxwv8+03GiryNOsM8jEJ2KcP9yx6govhS285icE+S4S6N7L/QIGjZIj5ny8VRfIkY7q9yV3/yB MgyUdYOw==; Received: from [2001:4bb8:191:2f6b:27f:45ef:e74a:3466] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.96 #2 (Red Hat Linux)) id 1rNUlv-00AsAi-1t; Wed, 10 Jan 2024 09:21:16 +0000 From: Christoph Hellwig To: Matthew Wilcox , Hugh Dickins , Chandan Babu R Subject: [PATCH 1/2] mm: add a mapping_clear_large_folios helper Date: Wed, 10 Jan 2024 10:21:08 +0100 Message-Id: <20240110092109.1950011-2-hch@lst.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240110092109.1950011-1-hch@lst.de> References: <20240110092109.1950011-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Darrick J . Wong" , dri-devel@lists.freedesktop.org, David Howells , linux-mm@kvack.org, Huang Rui , David Airlie , x86@kernel.org, Dave Hansen , Thomas Zimmermann , intel-gfx@lists.freedesktop.org, Maxime Ripard , Rodrigo Vivi , linux-sgx@vger.kernel.org, Jarkko Sakkinen , keyrings@vger.kernel.org, Daniel Vetter , linux-fsdevel@vger.kernel.org, Andrew Morton , Christian Koenig Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Users of shmem_kernel_file_setup might not be able to deal with large folios (yet). Give them a way to disable large folio support on their mapping. Signed-off-by: Christoph Hellwig --- include/linux/pagemap.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 06142ff7f9ce0e..352d1f8423292c 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -343,6 +343,20 @@ static inline void mapping_set_large_folios(struct address_space *mapping) __set_bit(AS_LARGE_FOLIO_SUPPORT, &mapping->flags); } +/** + * mapping_clear_large_folios() - Disable large folio support for a mapping + * @mapping: The mapping. + * + * This can be called to undo the effect of mapping_set_large_folios(). + * + * Context: This should not be called while the inode is active as it + * is non-atomic. + */ +static inline void mapping_clear_large_folios(struct address_space *mapping) +{ + __clear_bit(AS_LARGE_FOLIO_SUPPORT, &mapping->flags); +} + /* * Large folio support currently depends on THP. These dependencies are * being worked on but are not yet fixed. -- 2.39.2