Unfortunately, these only work if HAVE_JUMP_LABEL. In principle, we
could do some serious surgery on the core jump label infrastructure
to keep the patch infrastructure available on x86 on all builds, but
that's probably not worth it.
Signed-off-by: Andy Lutomirski <l...@kernel.org>
---
arch/x86/include/asm/jump_label.h | 52 +++++++++++++++++++++++++++++++++------
1 file changed, 44 insertions(+), 8 deletions(-)
diff --git a/arch/x86/include/asm/jump_label.h
b/arch/x86/include/asm/jump_label.h
index 5daeca3d0f9e..da275c1825f5 100644
--- a/arch/x86/include/asm/jump_label.h
+++ b/arch/x86/include/asm/jump_label.h
@@ -1,13 +1,6 @@
#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
@@ -16,6 +9,14 @@
# define STATIC_KEY_INIT_NOP GENERIC_NOP5_ATOMIC
#endif
+#include <asm/asm.h>
+#include <asm/nops.h>
+
+#ifndef __ASSEMBLY__
+
+#include <linux/stringify.h>
+#include <linux/types.h>
+
static __always_inline bool arch_static_branch(struct static_key *key, bool
branch)
{
asm_volatile_goto("1:"
@@ -59,5 +60,40 @@ struct jump_entry {
jump_label_t key;
};
-#endif /* __ASSEMBLY__ */
+#else /* __ASSEMBLY__ */
+
+.macro STATIC_JUMP_IF_TRUE target, key, def
+.Lstatic_jump_\@:
+ .if \def
+ /* Equivalent to "jmp.d32 \target" */
+ .byte 0xe9
+ .long \target - .Lstatic_jump_after_\@
+.Lstatic_jump_after_\@:
+ .else
+ .byte STATIC_KEY_INIT_NOP
+ .endif
+ .pushsection __jump_table, "aw"
+ _ASM_ALIGN
+ _ASM_PTR .Lstatic_jump_\@, \target, \key
+ .popsection
+.endm
+
+.macro STATIC_JUMP_IF_FALSE target, key, def
+.Lstatic_jump_\@:
+ .if \def
+ .byte STATIC_KEY_INIT_NOP
+ .else
+ /* Equivalent to "jmp.d32 \target" */
+ .byte 0xe9
+ .long \target - .Lstatic_jump_after_\@
+.Lstatic_jump_after_\@:
+ .endif
+ .pushsection __jump_table, "aw"
+ _ASM_ALIGN
+ _ASM_PTR .Lstatic_jump_\@, \target, \key + 1
+ .popsection
+.endm
+
+#endif /* __ASSEMBLY__ */
+
#endif
--
2.4.3
--
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