Commit 069f0cd0 authored Jul 05, 2016 by Borislav Petkov Committed by Ingo Molnar Jul 08, 2016

printk: Make the printk*once() variants return a value

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 <bp@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1467671487-10344-3-git-send-email-bp@alien8.de

Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent ef16dd0c

include/linux/printk.h

+12 −5

Original line number	Diff line number	Diff line
		@@ -109,10 +109,13 @@ struct va_format {
		* gcc's format checking.
		*/
		#define no_printk(fmt, ...) \
		({ \
		do { \
		if (0) \
		printk(fmt, ##__VA_ARGS__); \
		} while (0)
		} 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__); \
		} \
		unlikely(__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__); \
		} \
		unlikely(__ret_print_once); \
		})
		#else
		#define printk_once(fmt, ...) \