diff options
| author | Anton Blanchard <anton@samba.org> | 2015-04-09 13:51:31 +1000 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-04-09 09:40:24 +0200 |
| commit | c0ccf6f99e3a43b87980c9df7da48427885206d0 (patch) | |
| tree | 75ed67a3b57d5b7326255b747756f2e63d53da97 | |
| parent | 55dd0df781e58ec23d218376ea4a676e7362a98c (diff) | |
| download | lwn-c0ccf6f99e3a43b87980c9df7da48427885206d0.tar.gz lwn-c0ccf6f99e3a43b87980c9df7da48427885206d0.zip | |
jump_label: Allow jump labels to be used in assembly
To use jump labels in assembly we need the HAVE_JUMP_LABEL
define, so we select a fallback version if the toolchain does
not support them.
Modify linux/jump_label.h so it can be included by assembly
files. We also need to add -DCC_HAVE_ASM_GOTO to KBUILD_AFLAGS.
Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: benh@kernel.crashing.org
Cc: catalin.marinas@arm.com
Cc: davem@davemloft.net
Cc: heiko.carstens@de.ibm.com
Cc: jbaron@akamai.com
Cc: linux@arm.linux.org.uk
Cc: linuxppc-dev@lists.ozlabs.org
Cc: liuj97@gmail.com
Cc: mgorman@suse.de
Cc: mmarek@suse.cz
Cc: mpe@ellerman.id.au
Cc: paulus@samba.org
Cc: ralf@linux-mips.org
Cc: rostedt@goodmis.org
Cc: schwidefsky@de.ibm.com
Cc: will.deacon@arm.com
Link: http://lkml.kernel.org/r/1428551492-21977-2-git-send-email-anton@samba.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | Makefile | 1 | ||||
| -rw-r--r-- | include/linux/jump_label.h | 21 |
2 files changed, 18 insertions, 4 deletions
@@ -779,6 +779,7 @@ KBUILD_ARFLAGS := $(call ar-option,D) # check for 'asm goto' ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y) KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO + KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO endif include $(srctree)/scripts/Makefile.kasan diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h index 98f923b6a0ea..f4de473f226b 100644 --- a/include/linux/jump_label.h +++ b/include/linux/jump_label.h @@ -45,6 +45,12 @@ * same as using STATIC_KEY_INIT_FALSE. */ +#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL) +# define HAVE_JUMP_LABEL +#endif + +#ifndef __ASSEMBLY__ + #include <linux/types.h> #include <linux/compiler.h> #include <linux/bug.h> @@ -55,7 +61,7 @@ extern bool static_key_initialized; "%s used before call to jump_label_init", \ __func__) -#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL) +#ifdef HAVE_JUMP_LABEL struct static_key { atomic_t enabled; @@ -66,13 +72,18 @@ struct static_key { #endif }; -# include <asm/jump_label.h> -# define HAVE_JUMP_LABEL #else struct static_key { atomic_t enabled; }; -#endif /* CC_HAVE_ASM_GOTO && CONFIG_JUMP_LABEL */ +#endif /* HAVE_JUMP_LABEL */ +#endif /* __ASSEMBLY__ */ + +#ifdef HAVE_JUMP_LABEL +#include <asm/jump_label.h> +#endif + +#ifndef __ASSEMBLY__ enum jump_label_type { JUMP_LABEL_DISABLE = 0, @@ -203,3 +214,5 @@ static inline bool static_key_enabled(struct static_key *key) } #endif /* _LINUX_JUMP_LABEL_H */ + +#endif /* __ASSEMBLY__ */ |