diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-28 05:14:48 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-10-28 05:14:48 -0700 |
| commit | 8237eb946a1a23c600fb289cf8dd3b399b10604e (patch) | |
| tree | e3985782029601ede4035cfec7ee59e1a54324fd /arch/x86/kernel/microcode_core.c | |
| parent | cc21fe518a971bb2b0ab8370ec46ea21e84c57ab (diff) | |
| parent | bcb80e53877c2045d9e52f4a71372c3fe6501f6f (diff) | |
Merge branch 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
* 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86, microcode, AMD: Add microcode revision to /proc/cpuinfo
x86, microcode: Correct microcode revision format
coretemp: Get microcode revision from cpu_data
x86, intel: Use c->microcode for Atom errata check
x86, intel: Output microcode revision in /proc/cpuinfo
x86, microcode: Don't request microcode from userspace unnecessarily
Fix up trivial conflicts in arch/x86/kernel/cpu/amd.c (conflict between
moving AMD BSP code to cpu_dev helper function and adding AMD microcode
revision to /proc/cpuinfo code)
Diffstat (limited to 'arch/x86/kernel/microcode_core.c')
| -rw-r--r-- | arch/x86/kernel/microcode_core.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c index f9242800bc8..f2d2a664e79 100644 --- a/arch/x86/kernel/microcode_core.c +++ b/arch/x86/kernel/microcode_core.c @@ -483,7 +483,13 @@ mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu) sysfs_remove_group(&sys_dev->kobj, &mc_attr_group); pr_debug("CPU%d removed\n", cpu); break; - case CPU_DEAD: + + /* + * When a CPU goes offline, don't free up or invalidate the copy of + * the microcode in kernel memory, so that we can reuse it when the + * CPU comes back online without unnecessarily requesting the userspace + * for it again. + */ case CPU_UP_CANCELED_FROZEN: /* The CPU refused to come up during a system resume */ microcode_fini_cpu(cpu); |