mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 20:53:53 +08:00
55dd0df781
Wrap asm/jump_label.h for all archs with #ifndef __ASSEMBLY__. Since these are kernel only headers, we don't need #ifdef __KERNEL__ so can simplify things a bit. If an architecture wants to use jump labels in assembly, it will still need to define a macro to create the __jump_table entries (see ARCH_STATIC_BRANCH in the powerpc asm/jump_label.h for an example). 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/1428551492-21977-1-git-send-email-anton@samba.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
47 lines
884 B
C
47 lines
884 B
C
#ifndef _ASM_X86_JUMP_LABEL_H
|
|
#define _ASM_X86_JUMP_LABEL_H
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <linux/stringify.h>
|
|
#include <linux/types.h>
|
|
#include <asm/nops.h>
|
|
#include <asm/asm.h>
|
|
|
|
#define JUMP_LABEL_NOP_SIZE 5
|
|
|
|
#ifdef CONFIG_X86_64
|
|
# define STATIC_KEY_INIT_NOP P6_NOP5_ATOMIC
|
|
#else
|
|
# define STATIC_KEY_INIT_NOP GENERIC_NOP5_ATOMIC
|
|
#endif
|
|
|
|
static __always_inline bool arch_static_branch(struct static_key *key)
|
|
{
|
|
asm_volatile_goto("1:"
|
|
".byte " __stringify(STATIC_KEY_INIT_NOP) "\n\t"
|
|
".pushsection __jump_table, \"aw\" \n\t"
|
|
_ASM_ALIGN "\n\t"
|
|
_ASM_PTR "1b, %l[l_yes], %c0 \n\t"
|
|
".popsection \n\t"
|
|
: : "i" (key) : : l_yes);
|
|
return false;
|
|
l_yes:
|
|
return true;
|
|
}
|
|
|
|
#ifdef CONFIG_X86_64
|
|
typedef u64 jump_label_t;
|
|
#else
|
|
typedef u32 jump_label_t;
|
|
#endif
|
|
|
|
struct jump_entry {
|
|
jump_label_t code;
|
|
jump_label_t target;
|
|
jump_label_t key;
|
|
};
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif
|