From patchwork Sun Jul 1 16:01:45 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 10500095 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 D324D6035E for ; Sun, 1 Jul 2018 18:25:33 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C502028747 for ; Sun, 1 Jul 2018 18:25:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B950628759; Sun, 1 Jul 2018 18:25:33 +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=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4FA9928747 for ; Sun, 1 Jul 2018 18:25:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965029AbeGASZb (ORCPT ); Sun, 1 Jul 2018 14:25:31 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:33042 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753225AbeGAQSh (ORCPT ); Sun, 1 Jul 2018 12:18:37 -0400 Received: from localhost (LFbn-1-12247-202.w90-92.abo.wanadoo.fr [90.92.61.202]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id AF87386A; Sun, 1 Jul 2018 16:18:36 +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 Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sergey Senozhatsky , Petr Mladek , Linus Torvalds , Steven Rostedt , linux-doc@vger.kernel.org, linux-clk@vger.kernel.org, linux-pm@vger.kernel.org, linux-serial@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-renesas-soc@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH 4.4 035/105] lib/vsprintf: Remove atomic-unsafe support for %pCr Date: Sun, 1 Jul 2018 18:01:45 +0200 Message-Id: <20180701153151.781880637@linuxfoundation.org> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180701153149.382300170@linuxfoundation.org> References: <20180701153149.382300170@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 4.4-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/printk-formats.txt | 3 +-- lib/vsprintf.c | 3 --- 2 files changed, 1 insertion(+), 5 deletions(-) --- a/Documentation/printk-formats.txt +++ b/Documentation/printk-formats.txt @@ -273,11 +273,10 @@ 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 @@ -1345,9 +1345,6 @@ 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