x86/alternatives: Make optimize_nops() interrupt safe and synced

[pandora-kernel.git] / arch / x86 / kernel / alternative.c

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index fcec278..5f667f2 100644 (file)
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -323,10 +323,15 @@ done:
 
 static void __init_or_module optimize_nops(struct alt_instr *a, u8 *instr)
 {
+       unsigned long flags;
+
        if (instr[0] != 0x90)
                return;
 
+       local_irq_save(flags);
        add_nops(instr + (a->instrlen - a->padlen), a->padlen);
+       sync_core();
+       local_irq_restore(flags);
 
        DUMP_BYTES(instr, a->instrlen, "%p: [%d:%d) optimized NOPs: ",
                   instr, a->instrlen - a->padlen, a->padlen);