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| author | Peter Zijlstra <peterz@infradead.org> | 2021-05-06 22:33:56 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2021-05-12 15:54:55 +0300 |
| commit | e1aa35c4c4bc71e44dabc9d7d167b807edd7b439 (patch) | |
| tree | 24d2087ed38ce5bdbc175f61a2d623b0158d4b33 /arch/x86/include/asm/jump_label.h | |
| parent | 8bfafcdccb52e770695b12530b1f800fe98b16b1 (diff) | |
| download | linux-e1aa35c4c4bc71e44dabc9d7d167b807edd7b439.tar.xz | |
jump_label, x86: Factor out the __jump_table generation
Both arch_static_branch() and arch_static_branch_jump() have the same
blurb to generate the __jump_table entry, share it.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210506194157.663132781@infradead.org
Diffstat (limited to 'arch/x86/include/asm/jump_label.h')
| -rw-r--r-- | arch/x86/include/asm/jump_label.h | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/arch/x86/include/asm/jump_label.h b/arch/x86/include/asm/jump_label.h index 01de21e2d967..dfdc2b1c17dd 100644 --- a/arch/x86/include/asm/jump_label.h +++ b/arch/x86/include/asm/jump_label.h @@ -14,15 +14,19 @@ #include <linux/stringify.h> #include <linux/types.h> +#define JUMP_TABLE_ENTRY \ + ".pushsection __jump_table, \"aw\" \n\t" \ + _ASM_ALIGN "\n\t" \ + ".long 1b - . \n\t" \ + ".long %l[l_yes] - . \n\t" \ + _ASM_PTR "%c0 + %c1 - .\n\t" \ + ".popsection \n\t" + static __always_inline bool arch_static_branch(struct static_key * const key, const bool branch) { asm_volatile_goto("1:" ".byte " __stringify(BYTES_NOP5) "\n\t" - ".pushsection __jump_table, \"aw\" \n\t" - _ASM_ALIGN "\n\t" - ".long 1b - ., %l[l_yes] - . \n\t" - _ASM_PTR "%c0 + %c1 - .\n\t" - ".popsection \n\t" + JUMP_TABLE_ENTRY : : "i" (key), "i" (branch) : : l_yes); return false; @@ -33,13 +37,9 @@ l_yes: static __always_inline bool arch_static_branch_jump(struct static_key * const key, const bool branch) { asm_volatile_goto("1:" - ".byte 0xe9\n\t .long %l[l_yes] - 2f\n\t" - "2:\n\t" - ".pushsection __jump_table, \"aw\" \n\t" - _ASM_ALIGN "\n\t" - ".long 1b - ., %l[l_yes] - . \n\t" - _ASM_PTR "%c0 + %c1 - .\n\t" - ".popsection \n\t" + ".byte 0xe9 \n\t" + ".long %l[l_yes] - (. + 4) \n\t" + JUMP_TABLE_ENTRY : : "i" (key), "i" (branch) : : l_yes); return false; |