[3.5.y.z extended stable] Patch "x86/microcode/amd: Tone down printk(), don't treat a missing firmware" has been added to staging queue

Luis Henriques luis.henriques at canonical.com
Fri Nov 29 14:02:43 UTC 2013

This is a note to let you know that I have just added a patch titled

    x86/microcode/amd: Tone down printk(), don't treat a missing firmware

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:


If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see



>From 3590e671d110131e1b49f0c663ef4ddacaa1e022 Mon Sep 17 00:00:00 2001
From: Thomas Renninger <trenn at suse.de>
Date: Tue, 12 Nov 2013 17:39:43 +0100
Subject: x86/microcode/amd: Tone down printk(), don't treat a missing firmware
 file as an error

commit 11f918d3e2d3861b6931e97b3aa778e4984935aa upstream.

Do it the same way as done in microcode_intel.c: use pr_debug()
for missing firmware files.

There seem to be CPUs out there for which no microcode update
has been submitted to kernel-firmware repo yet resulting in
scary sounding error messages in dmesg:

  microcode: failed to load file amd-ucode/microcode_amd_fam16h.bin

Signed-off-by: Thomas Renninger <trenn at suse.de>
Acked-by: Borislav Petkov <bp at suse.de>
Link: http://lkml.kernel.org/r/1384274383-43510-1-git-send-email-trenn@suse.de
Signed-off-by: Ingo Molnar <mingo at kernel.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
 arch/x86/kernel/microcode_amd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c
index 5d8cf0d..b316ffe 100644
--- a/arch/x86/kernel/microcode_amd.c
+++ b/arch/x86/kernel/microcode_amd.c
@@ -338,7 +338,7 @@ static enum ucode_state request_microcode_amd(int cpu, struct device *device)
 		snprintf(fw_name, sizeof(fw_name), "amd-ucode/microcode_amd_fam%.2xh.bin", c->x86);

 	if (request_firmware(&fw, (const char *)fw_name, device)) {
-		pr_err("failed to load file %s\n", fw_name);
+		pr_debug("failed to load file %s\n", fw_name);
 		goto out;


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