x86/alternatives: Optimize optimize_nops()

Return early if NOPs have already been optimized. Signed-off-by: Borislav Petkov (AMD) <[email protected]> Link: https://lore.kernel.org/r/[email protected]
foric27 · Apr 9, 2024 · c3a3cb5 · c3a3cb5
1 parent da8f9cf
commit c3a3cb5
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
@@ -233,6 +233,10 @@ static void noinline optimize_nops(const u8 * const instr, u8 *buf, size_t len)
 		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);