From 58b5f2cc4bdbc9b616e68639f5a84886aa5be590 Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Wed, 3 Feb 2016 12:33:38 +0100 Subject: [PATCH] x86/microcode/intel: Move the BUG_ON up and turn it into WARN_ON If we're going to BUG_ON() because we're running on the wrong CPU, we better do it as the first thing we do when entering that function. And also, turn it into a WARN_ON() because it is not worth to panic the system if we apply the microcode on the wrong CPU - we're simply going to exit early. Tested-by: Thomas Voegtle Signed-off-by: Borislav Petkov Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/1454499225-21544-11-git-send-email-bp@alien8.de Signed-off-by: Ingo Molnar --- arch/x86/kernel/cpu/microcode/intel.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c index d1b2f583f543..c029c2bb2a29 100644 --- a/arch/x86/kernel/cpu/microcode/intel.c +++ b/arch/x86/kernel/cpu/microcode/intel.c @@ -843,12 +843,12 @@ static int apply_microcode_intel(int cpu) int cpu_num = raw_smp_processor_id(); struct cpuinfo_x86 *c = &cpu_data(cpu_num); - uci = ucode_cpu_info + cpu; - mc = uci->mc; - /* We should bind the task to the CPU */ - BUG_ON(cpu_num != cpu); + if (WARN_ON(cpu_num != cpu)) + return -1; + uci = ucode_cpu_info + cpu; + mc = uci->mc; if (!mc) return 0; -- 2.39.5