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| author |   Peter Zijlstra <peterz@infradead.org> | 2021-05-06 21:34:01 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2021-05-12 14:54:55 +0200 |
| commit | e7bf1ba97afdde75b0ef43e4bdb718bf843613f1 (patch) | |
| tree | 090e3ff09488c36c2becee9bc596f92d752ef6be /arch/x86/include/asm/jump_label.h | |
| parent | jump_label: Free jump_entry::key bit1 for build use (diff) | |
| download | linux-dev-e7bf1ba97afdde75b0ef43e4bdb718bf843613f1.tar.xz linux-dev-e7bf1ba97afdde75b0ef43e4bdb718bf843613f1.zip | |
jump_label, x86: Emit short JMP
Now that we can patch short JMP/NOP, allow the compiler/assembler to
emit short JMP instructions.
There is no way to have the assembler emit short NOPs based on the
potential displacement, so leave those long for now.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20210506194157.967034497@infradead.org
Diffstat (limited to 'arch/x86/include/asm/jump_label.h')
| -rw-r--r-- | arch/x86/include/asm/jump_label.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/x86/include/asm/jump_label.h b/arch/x86/include/asm/jump_label.h index d85802a00629..ef819e33cfc1 100644 --- a/arch/x86/include/asm/jump_label.h +++ b/arch/x86/include/asm/jump_label.h @@ -35,8 +35,7 @@ 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] - (. + 4) \n\t" + "jmp %l[l_yes]\n\t" JUMP_TABLE_ENTRY : : "i" (key), "i" (branch) : : l_yes); |