x86/alternatives: Optimize optimize_nops()

Return early if NOPs have already been optimized.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240130105941.19707-4-bp@alien8.de

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 4b3378c715182e0eabd880668eacb88f88bed4b1..67dd7c371d28a57c879168f7c752a315658771df 100644 (file)
--- 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);