From: Ashok Raj Date: Mon, 29 Aug 2022 18:10:30 +0000 (+0000) Subject: x86/microcode: Print previous version of microcode after reload X-Git-Tag: v6.6.17~6509^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7fce8d6eccbc31a561d07c79f359ad09f0424347;p=platform%2Fkernel%2Flinux-rpi.git x86/microcode: Print previous version of microcode after reload Print both old and new versions of microcode after a reload is complete because knowing the previous microcode version is sometimes important from a debugging perspective. [ bp: Massage commit message. ] Signed-off-by: Ashok Raj Signed-off-by: Borislav Petkov Acked-by: Tony Luck Link: https://lore.kernel.org/r/20220829181030.722891-1-ashok.raj@intel.com --- diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c index ad57e0e..6a41cee2 100644 --- a/arch/x86/kernel/cpu/microcode/core.c +++ b/arch/x86/kernel/cpu/microcode/core.c @@ -491,7 +491,7 @@ wait_for_siblings: */ static int microcode_reload_late(void) { - int ret; + int old = boot_cpu_data.microcode, ret; pr_err("Attempting late microcode loading - it is dangerous and taints the kernel.\n"); pr_err("You should switch to early loading, if possible.\n"); @@ -503,7 +503,8 @@ static int microcode_reload_late(void) if (ret == 0) microcode_check(); - pr_info("Reload completed, microcode revision: 0x%x\n", boot_cpu_data.microcode); + pr_info("Reload completed, microcode revision: 0x%x -> 0x%x\n", + old, boot_cpu_data.microcode); return ret; }