[PATCH 3/4] x86/alternatives: Optimize optimize_nops()

Borislav Petkov
2024-01-30T11:00:10Z

From: "Borislav Petkov (AMD)" <bp@alien8.de>

Return early if NOPs have already been optimized.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
---
arch/x86/kernel/alternative.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 2dd1c7fe0949..68ee46c379c1 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -233,6 +233,10 @@ static void __init_or_module noinline optimize_nops(const u8 * const instr, u8 *
if (insn_is_nop(&insn)) {
int nop = i;

+ /* Has the NOP already been optimized? */
+ if (i + insn.length == len)
+ return;
+
next = skip_nops(buf, next, len);

add_nop(buf + nop, next - nop);
--
2.43.0