From patchwork Sun Jul 1 16:20:57 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 10499355 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 7FEE260284 for ; Sun, 1 Jul 2018 16:40:29 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6E9D4286B6 for ; Sun, 1 Jul 2018 16:40:29 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6CD7D289D1; Sun, 1 Jul 2018 16:40:29 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 4E2B7286B6 for ; Sun, 1 Jul 2018 16:40:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=JIPnkK0hbRzfe86HDS0x+o+E0spH3UbAqE/SrzFH3b8=; b=IC1EAkjKy8Kvte iYwvORYcqjLwXVk5w3cAk/vugWD7InnO68bIuHDS0rYaN+chW4dY1rWIf90FIGDFQXmfgULkFDuxV w+riVUGmYys/tIyJMtxswMuzGsh0kN7PH3ecHrmChtMH8DuHLnuUPhzRwzT64LJnKj3kMTWOgLm11 OeZRwt4lOjRghBRTfC7ySjRkK9ILi3l61fRC5YElPuij8TIj857cPZ6wNnzXW2f1WldkXVwZSBYYo Dk0rQEuDyKgBSBaJD0xLTE4D27RQVjc3n3LT8aTwQEmPgPVX+sV3qt7ZFxqFsJDiYdLoVnmEf7BdE 7txTdKuE/BdXy9KjB3Iw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fZfOf-0006RS-VN; Sun, 01 Jul 2018 16:40:21 +0000 Received: from mail.linuxfoundation.org ([140.211.169.12]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1fZfOc-0005uI-4W for linux-arm-kernel@lists.infradead.org; Sun, 01 Jul 2018 16:40:20 +0000 Received: from localhost (LFbn-1-12247-202.w90-92.abo.wanadoo.fr [90.92.61.202]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id 34669ACD; Sun, 1 Jul 2018 16:40:07 +0000 (UTC) From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, Jia-Ju Bai , Jonathan Corbet , Michael Turquette , Stephen Boyd , Zhang Rui , Eduardo Valentin , Eric Anholt , Stefan Wahren Subject: [PATCH 4.17 033/220] lib/vsprintf: Remove atomic-unsafe support for %pCr Date: Sun, 1 Jul 2018 18:20:57 +0200 Message-Id: <20180701160909.718293393@linuxfoundation.org> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180701160908.272447118@linuxfoundation.org> References: <20180701160908.272447118@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180701_094018_289931_AB9A46AD X-CRM114-Status: GOOD ( 11.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Petr Mladek , Sergey Senozhatsky , Geert Uytterhoeven , linux-doc@vger.kernel.org, Greg Kroah-Hartman , linux-pm@vger.kernel.org, Steven Rostedt , linux-renesas-soc@vger.kernel.org, stable@vger.kernel.org, linux-serial@vger.kernel.org, Linus Torvalds , linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 4.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Geert Uytterhoeven commit 666902e42fd8344b923c02dc5b0f37948ff4f225 upstream. "%pCr" formats the current rate of a clock, and calls clk_get_rate(). The latter obtains a mutex, hence it must not be called from atomic context. Remove support for this rarely-used format, as vsprintf() (and e.g. printk()) must be callable from any context. Any remaining out-of-tree users will start seeing the clock's name printed instead of its rate. Reported-by: Jia-Ju Bai Fixes: 900cca2944254edd ("lib/vsprintf: add %pC{,n,r} format specifiers for clocks") Link: http://lkml.kernel.org/r/1527845302-12159-5-git-send-email-geert+renesas@glider.be To: Jia-Ju Bai To: Jonathan Corbet To: Michael Turquette To: Stephen Boyd To: Zhang Rui To: Eduardo Valentin To: Eric Anholt To: Stefan Wahren To: Greg Kroah-Hartman Cc: Sergey Senozhatsky Cc: Petr Mladek Cc: Linus Torvalds Cc: Steven Rostedt Cc: linux-doc@vger.kernel.org Cc: linux-clk@vger.kernel.org Cc: linux-pm@vger.kernel.org Cc: linux-serial@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-renesas-soc@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: Geert Uytterhoeven Cc: stable@vger.kernel.org # 4.1+ Signed-off-by: Geert Uytterhoeven Signed-off-by: Petr Mladek Signed-off-by: Greg Kroah-Hartman --- Documentation/core-api/printk-formats.rst | 3 +-- lib/vsprintf.c | 3 --- 2 files changed, 1 insertion(+), 5 deletions(-) --- a/Documentation/core-api/printk-formats.rst +++ b/Documentation/core-api/printk-formats.rst @@ -419,11 +419,10 @@ struct clk %pC pll1 %pCn pll1 - %pCr 1560000000 For printing struct clk structures. %pC and %pCn print the name (Common Clock Framework) or address (legacy clock framework) of the -structure; %pCr prints the current clock rate. +structure. Passed by reference. --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -1456,9 +1456,6 @@ char *clock(char *buf, char *end, struct return string(buf, end, NULL, spec); switch (fmt[1]) { - case 'r': - return number(buf, end, clk_get_rate(clk), spec); - case 'n': default: #ifdef CONFIG_COMMON_CLK