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| author | Peter Zijlstra <peterz@infradead.org> | 2019-10-09 12:44:17 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2019-11-27 07:44:24 +0100 |
| commit | 254d2c04515ea4532a503cc5d8649e1513042e56 (patch) | |
| tree | db80da541648e4e40fe11f4b066425c4e2b51d62 /arch/x86/kernel/alternative.c | |
| parent | c12af4407fa5a3fc6396bde379e0882a132df49b (diff) | |
| download | lwn-254d2c04515ea4532a503cc5d8649e1513042e56.tar.gz lwn-254d2c04515ea4532a503cc5d8649e1513042e56.zip | |
x86/alternative: Add text_opcode_size()
Introduce a common helper to map *_INSN_OPCODE to *_INSN_SIZE.
Tested-by: Alexei Starovoitov <ast@kernel.org>
Tested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20191111132457.875666061@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/alternative.c')
| -rw-r--r-- | arch/x86/kernel/alternative.c | 12 |
1 files changed, 1 insertions, 11 deletions
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c index ce737f1da834..f8f34f94d13d 100644 --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -1259,22 +1259,12 @@ union text_poke_insn { void *text_gen_insn(u8 opcode, const void *addr, const void *dest) { static union text_poke_insn insn; /* text_mutex */ - int size = 0; + int size = text_opcode_size(opcode); lockdep_assert_held(&text_mutex); insn.opcode = opcode; -#define __CASE(insn) \ - case insn##_INSN_OPCODE: size = insn##_INSN_SIZE; break - - switch(opcode) { - __CASE(INT3); - __CASE(CALL); - __CASE(JMP32); - __CASE(JMP8); - } - if (size > 1) { insn.disp = (long)dest - (long)(addr + size); if (size == 2) |