From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751129AbaFVWrW (ORCPT ); Sun, 22 Jun 2014 18:47:22 -0400 Received: from mail-wi0-f180.google.com ([209.85.212.180]:48533 "EHLO mail-wi0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750780AbaFVWrQ (ORCPT ); Sun, 22 Jun 2014 18:47:16 -0400 From: Mathias Krause To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Greg Kroah-Hartman , Steven Rostedt , Joe Perches , "Rafael J. Wysocki" , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Jason Baron , Mathias Krause Subject: [RFC PATCH 1/3] init.h: Add __init_str / __exit_str macros Date: Mon, 23 Jun 2014 00:46:47 +0200 Message-Id: <1403477209-14612-2-git-send-email-minipli@googlemail.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1403477209-14612-1-git-send-email-minipli@googlemail.com> References: <1403477209-14612-1-git-send-email-minipli@googlemail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add macros to be able to mark string literals used in __init / __exit functions. Signed-off-by: Mathias Krause --- include/linux/init.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/include/linux/init.h b/include/linux/init.h index 2df8e8dd10..0a425b296e 100644 --- a/include/linux/init.h +++ b/include/linux/init.h @@ -35,6 +35,18 @@ * Don't forget to initialize data not at file scope, i.e. within a function, * as gcc otherwise puts the data into the bss section and not into the init * section. + * + * For messages printed in __init / __exit functions the __init_str() / + * __exit_str() macros will take care of marking the strings accordingly so + * they can be freed, too. Otherwise the strings would resist in memory, even + * though they are no longer referenced. + * + * Use them like this: + * + * static void __init initme(void) + * { + * printk(__init_str(KERN_INFO "I am fully initialized, now\n")); + * } */ /* These are for everybody (although not all archs will actually @@ -45,6 +57,12 @@ #define __exitdata __section(.exit.data) #define __exit_call __used __section(.exitcall.exit) +/* Those can be used to mark strings used in __init / __exit functions. */ +#define __init_str(str) __mark_str(str, __UNIQUE_ID(_init_str_), __initconst) +#define __exit_str(str) __mark_str(str, __UNIQUE_ID(_exit_str_), __exitdata) +#define __mark_str(str, var, __section) \ + ({ static const char var[] __section __aligned(1) = str; var; }) + /* * Some architecture have tool chains which do not handle rodata attributes * correctly. For those disable special sections for const, so that other -- 1.7.10.4