From 57adc4d2dbf968fdbe516359688094eef4d46581 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Wed, 6 May 2009 16:02:53 -0700 Subject: [PATCH] Eliminate thousands of warnings with gcc 3.2 build When building with gcc 3.2 I get thousands of warnings such as include/linux/gfp.h: In function `allocflags_to_migratetype': include/linux/gfp.h:105: warning: null format string due to passing a NULL format string to warn_slowpath() in #define __WARN() warn_slowpath(__FILE__, __LINE__, NULL) Split this case out into a separate call. This also shrinks the kernel slightly: text data bss dec hex filename 4802274 707668 712704 6222646 5ef336 vmlinux text data bss dec hex filename 4799027 703572 712704 6215303 5ed687 vmlinux due to removeing one argument from the commonly-called __WARN(). [akpm@linux-foundation.org: reduce scope of `empty'] Acked-by: Jesper Nilsson Acked-by: Johannes Weiner Acked-by: Arjan van de Ven Signed-off-by: Andi Kleen Cc: Hugh Dickins Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-generic/bug.h | 7 ++++--- kernel/panic.c | 13 ++++++++++--- 2 files changed, 14 insertions(+), 6 deletions(-) diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h index e727fe0..4b67559 100644 --- a/include/asm-generic/bug.h +++ b/include/asm-generic/bug.h @@ -58,12 +58,13 @@ struct bug_entry { */ #ifndef __WARN #ifndef __ASSEMBLY__ -extern void warn_slowpath(const char *file, const int line, +extern void warn_slowpath_fmt(const char *file, const int line, const char *fmt, ...) __attribute__((format(printf, 3, 4))); +extern void warn_slowpath_null(const char *file, const int line); #define WANT_WARN_ON_SLOWPATH #endif -#define __WARN() warn_slowpath(__FILE__, __LINE__, NULL) -#define __WARN_printf(arg...) warn_slowpath(__FILE__, __LINE__, arg) +#define __WARN() warn_slowpath_null(__FILE__, __LINE__) +#define __WARN_printf(arg...) warn_slowpath_fmt(__FILE__, __LINE__, arg) #else #define __WARN_printf(arg...) do { printk(arg); __WARN(); } while (0) #endif diff --git a/kernel/panic.c b/kernel/panic.c index 3dcaa16..874ecf1 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -340,7 +340,7 @@ void oops_exit(void) } #ifdef WANT_WARN_ON_SLOWPATH -void warn_slowpath(const char *file, int line, const char *fmt, ...) +void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...) { va_list args; char function[KSYM_SYMBOL_LEN]; @@ -356,7 +356,7 @@ void warn_slowpath(const char *file, int line, const char *fmt, ...) if (board) printk(KERN_WARNING "Hardware name: %s\n", board); - if (fmt) { + if (*fmt) { va_start(args, fmt); vprintk(fmt, args); va_end(args); @@ -367,7 +367,14 @@ void warn_slowpath(const char *file, int line, const char *fmt, ...) print_oops_end_marker(); add_taint(TAINT_WARN); } -EXPORT_SYMBOL(warn_slowpath); +EXPORT_SYMBOL(warn_slowpath_fmt); + +void warn_slowpath_null(const char *file, int line) +{ + static const char *empty = ""; + warn_slowpath_fmt(file, line, empty); +} +EXPORT_SYMBOL(warn_slowpath_null); #endif #ifdef CONFIG_CC_STACKPROTECTOR -- 1.8.2.3