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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1F561C433FE for ; Fri, 5 Nov 2021 20:36:55 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id E3FEF61252 for ; Fri, 5 Nov 2021 20:36:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org E3FEF61252 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 80A9894000F; Fri, 5 Nov 2021 16:36:54 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7977C940007; Fri, 5 Nov 2021 16:36:54 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5E71F94000F; Fri, 5 Nov 2021 16:36:54 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0202.hostedemail.com [216.40.44.202]) by kanga.kvack.org (Postfix) with ESMTP id 45794940007 for ; Fri, 5 Nov 2021 16:36:54 -0400 (EDT) Received: from smtpin15.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id EEFEB1856A8C9 for ; Fri, 5 Nov 2021 20:36:53 +0000 (UTC) X-FDA: 78776035506.15.12A4C42 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf23.hostedemail.com (Postfix) with ESMTP id E0FB890000A6 for ; Fri, 5 Nov 2021 20:36:40 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 9C37E611C0; Fri, 5 Nov 2021 20:36:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1636144612; bh=TYOkewgMcv8aVJYVpBRuZQ4keM8guxXKpPSzDyaFzRY=; h=Date:From:To:Subject:In-Reply-To:From; b=Q3sV0JYtwM3fSC0fuqAzP5m/OcF6RsVLq+eZWpyXtLVnD8itFdbIw6O2kWETUyHMg rpOUyQWl0nVf6PU/PSoyyAOtjMz0Zr6Ls6xwK5bnj6Y4o5DwtSSS3p/StulwiiGWlW n9p7uReLFdXAFM3kp8TgqvEy/ZxpFjGc6CeDEiWQ= Date: Fri, 05 Nov 2021 13:36:52 -0700 From: Andrew Morton To: akpm@linux-foundation.org, hch@lst.de, jack@suse.cz, linux-mm@kvack.org, miquel.raynal@bootlin.com, mm-commits@vger.kernel.org, richard@nod.at, torvalds@linux-foundation.org, vigneshr@ti.com Subject: [patch 042/262] mm: export bdi_unregister Message-ID: <20211105203652._au34liRg%akpm@linux-foundation.org> In-Reply-To: <20211105133408.cccbb98b71a77d5e8430aba1@linux-foundation.org> User-Agent: s-nail v14.8.16 Authentication-Results: imf23.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=Q3sV0JYt; dmarc=none; spf=pass (imf23.hostedemail.com: domain of akpm@linux-foundation.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: E0FB890000A6 X-Stat-Signature: ryw1z4wwp6sh997zor1dspgfiwfkuic8 X-HE-Tag: 1636144600-202404 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Christoph Hellwig Subject: mm: export bdi_unregister Patch series "simplify bdi unregistation". This series simplifies the BDI code to get rid of the magic auto-unregister feature that hid a recent block layer refcounting bug. This patch (of 5): To wind down the magic auto-unregister semantics we'll need to push this into modular code. Link: https://lkml.kernel.org/r/20211021124441.668816-1-hch@lst.de Link: https://lkml.kernel.org/r/20211021124441.668816-2-hch@lst.de Signed-off-by: Christoph Hellwig Reviewed-by: Jan Kara Cc: Miquel Raynal Cc: Richard Weinberger Cc: Vignesh Raghavendra Signed-off-by: Andrew Morton --- mm/backing-dev.c | 1 + 1 file changed, 1 insertion(+) --- a/mm/backing-dev.c~mm-export-bdi_unregister +++ a/mm/backing-dev.c @@ -958,6 +958,7 @@ void bdi_unregister(struct backing_dev_i bdi->owner = NULL; } } +EXPORT_SYMBOL(bdi_unregister); static void release_bdi(struct kref *ref) { _