From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751721AbcFXIbN (ORCPT ); Fri, 24 Jun 2016 04:31:13 -0400 Received: from mail.skyhub.de ([78.46.96.112]:37039 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751704AbcFXIbK (ORCPT ); Fri, 24 Jun 2016 04:31:10 -0400 From: Borislav Petkov To: LKML Cc: Andrew Morton , Andy Lutomirski , X86 ML Subject: [PATCH 2/3] printk: Make the printk*once() variants return a value Date: Fri, 24 Jun 2016 10:30:19 +0200 Message-Id: <20160624083020.26871-3-bp@alien8.de> X-Mailer: git-send-email 2.8.4 In-Reply-To: <20160624083020.26871-1-bp@alien8.de> References: <20160624083020.26871-1-bp@alien8.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Borislav Petkov Have printk*once() return a bool which denotes whether the string was printed or not so that calling code can react accordingly. Signed-off-by: Borislav Petkov Cc: Andrew Morton --- include/linux/printk.h | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/include/linux/printk.h b/include/linux/printk.h index f4da695fd615..464fcdddb359 100644 --- a/include/linux/printk.h +++ b/include/linux/printk.h @@ -108,11 +108,14 @@ struct va_format { * Dummy printk for disabled debugging statements to use whilst maintaining * gcc's format checking. */ -#define no_printk(fmt, ...) \ -do { \ - if (0) \ - printk(fmt, ##__VA_ARGS__); \ -} while (0) +#define no_printk(fmt, ...) \ +({ \ + do { \ + if (0) \ + printk(fmt, ##__VA_ARGS__); \ + } while (0); \ + 0; \ +}) #ifdef CONFIG_EARLY_PRINTK extern asmlinkage __printf(1, 2) @@ -309,20 +312,24 @@ extern asmlinkage void dump_stack(void) __cold; #define printk_once(fmt, ...) \ ({ \ static bool __print_once __read_mostly; \ + bool __ret_print_once = !__print_once; \ \ if (!__print_once) { \ __print_once = true; \ printk(fmt, ##__VA_ARGS__); \ } \ + __ret_print_once; \ }) #define printk_deferred_once(fmt, ...) \ ({ \ static bool __print_once __read_mostly; \ + bool __ret_print_once = !__print_once; \ \ if (!__print_once) { \ __print_once = true; \ printk_deferred(fmt, ##__VA_ARGS__); \ } \ + __ret_print_once; \ }) #else #define printk_once(fmt, ...) \ -- 2.8.4