* Mike Galbraith <umgwanakikb...@gmail.com> wrote:
> On Sat, 2015-06-27 at 08:25 +0200, Mike Galbraith wrote:
> > Hi Ingo,
> >
> > My i7-4790 box is having one hell of a time with this merge window, is
> > dead in the water.
>
> BIOS setting "Limit CPUID Maximum" upsets new fpu code mightily.
Ok, that's interesting. Mind explaining it a bit more verbosely - which setting
is
causing what?
This would suggest sensitivity on CPUID details, i.e. that doing
fpu__init_system() before other CPU init sequences is causing the bug.
Does the patch below perhaps make a difference? (I'd suggest to apply it
_without_
the other patch I sent.)
Thanks,
Ingo
arch/x86/kernel/cpu/common.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 9fc5e3d9d9c8..922c5e0cea4c 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -742,7 +742,6 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
cpu_detect(c);
get_cpu_vendor(c);
get_cpu_cap(c);
- fpu__init_system(c);
if (this_cpu->c_early_init)
this_cpu->c_early_init(c);
@@ -754,6 +753,7 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
this_cpu->c_bsp_init(c);
setup_force_cpu_cap(X86_FEATURE_ALWAYS);
+ fpu__init_system(c);
}
void __init early_cpu_init(void)
--
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