[lkml]   [2006]   [Nov]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[patch] Regression in 2.6.19-rc microcode driver

if the microcode driver is built in (rather than module) there are some,
ehm, interesting effects happening due to the new "call out to
userspace" behavior that is introduced.. and which runs too early. The
result is a boot hang; which is really nasty.

The patch below is a minimally safe patch to fix this regression for
2.6.19 by just not requesting actual microcode updates during early
boot. (That is a good idea in general anyway)

The "real" fix is a lot more complex given the entire cpu hotplug
scenario (during cpu hotplug you normally need to load the microcode as
well); but the interactions for that are just really messy at this
point; this fix at least makes it work and avoids a full detangle of

Signed-off-by: Arjan van de Ven <>

--- linux-2.6.18/arch/i386/kernel/ 2006-11-06 14:50:37.000000000 +0100
+++ linux-2.6.18/arch/i386/kernel/microcode.c 2006-11-06 14:52:30.000000000 +0100
@@ -577,7 +577,7 @@ static void microcode_init_cpu(int cpu)
set_cpus_allowed(current, cpumask_of_cpu(cpu));
- if (uci->valid)
+ if (uci->valid && system_state==SYSTEM_RUNNING)
set_cpus_allowed(current, old);
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2006-11-06 15:21    [from the cache]
©2003-2014 Jasper Spaans. hosted at Digital Ocean