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Subject[tip: core/kprobes] x86/alternatives: Use INT3_INSN_SIZE
The following commit has been merged into the core/kprobes branch of tip:

Commit-ID: 0be6748cdf517626d10a055f3ac9f388a4ab1cce
Gitweb: https://git.kernel.org/tip/0be6748cdf517626d10a055f3ac9f388a4ab1cce
Author: Peter Zijlstra <peterz@infradead.org>
AuthorDate: Mon, 11 Nov 2019 14:08:26 +01:00
Committer: Ingo Molnar <mingo@kernel.org>
CommitterDate: Tue, 19 Nov 2019 13:13:09 +01:00

x86/alternatives: Use INT3_INSN_SIZE

Use INT3_INSN_SIZE instead of sizeof(int3).

Suggested-by: Ingo Molnar <mingo@kernel.org>
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: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20191111132458.460144656@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/alternative.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 6455902..4552795 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -1088,7 +1088,7 @@ static void text_poke_bp_batch(struct text_poke_loc *tp, unsigned int nr_entries
* First step: add a int3 trap to the address that will be patched.
*/
for (i = 0; i < nr_entries; i++)
- text_poke(text_poke_addr(&tp[i]), &int3, sizeof(int3));
+ text_poke(text_poke_addr(&tp[i]), &int3, INT3_INSN_SIZE);

text_poke_sync();

@@ -1098,10 +1098,10 @@ static void text_poke_bp_batch(struct text_poke_loc *tp, unsigned int nr_entries
for (do_sync = 0, i = 0; i < nr_entries; i++) {
int len = text_opcode_size(tp[i].opcode);

- if (len - sizeof(int3) > 0) {
- text_poke(text_poke_addr(&tp[i]) + sizeof(int3),
- (const char *)tp[i].text + sizeof(int3),
- len - sizeof(int3));
+ if (len - INT3_INSN_SIZE > 0) {
+ text_poke(text_poke_addr(&tp[i]) + INT3_INSN_SIZE,
+ (const char *)tp[i].text + INT3_INSN_SIZE,
+ len - INT3_INSN_SIZE);
do_sync++;
}
}
@@ -1123,7 +1123,7 @@ static void text_poke_bp_batch(struct text_poke_loc *tp, unsigned int nr_entries
if (tp[i].text[0] == INT3_INSN_OPCODE)
continue;

- text_poke(text_poke_addr(&tp[i]), tp[i].text, sizeof(int3));
+ text_poke(text_poke_addr(&tp[i]), tp[i].text, INT3_INSN_SIZE);
do_sync++;
}

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