[PATCH 4.7 008/141] x86/boot: Initialize FPU and X86_FEATURE_ALWAYS even if we dont have CPUID

From: Greg Kroah-Hartman
Date: Thu Oct 06 2016 - 04:37:14 EST


4.7-stable review patch. If anyone has any objections, please let me know.

------------------

From: Andy Lutomirski <luto@xxxxxxxxxx>

commit 05fb3c199bb09f5b85de56cc3ede194ac95c5e1f upstream.

Otherwise arch_task_struct_size == 0 and we die. While we're at it,
set X86_FEATURE_ALWAYS, too.

Reported-by: David Saggiorato <david@xxxxxxxxxxxxxx>
Tested-by: David Saggiorato <david@xxxxxxxxxxxxxx>
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Dave Hansen <dave@xxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Fixes: aaeb5c01c5b ("x86/fpu, sched: Introduce CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT and use it on x86")
Link: http://lkml.kernel.org/r/8de723afbf0811071185039f9088733188b606c9.1475103911.git.luto@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
arch/x86/kernel/cpu/common.c | 29 ++++++++++++++---------------
1 file changed, 14 insertions(+), 15 deletions(-)

--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -804,21 +804,20 @@ static void __init early_identify_cpu(st
identify_cpu_without_cpuid(c);

/* cyrix could have cpuid enabled via c_identify()*/
- if (!have_cpuid_p())
- return;
-
- cpu_detect(c);
- get_cpu_vendor(c);
- get_cpu_cap(c);
-
- if (this_cpu->c_early_init)
- this_cpu->c_early_init(c);
-
- c->cpu_index = 0;
- filter_cpuid_features(c, false);
-
- if (this_cpu->c_bsp_init)
- this_cpu->c_bsp_init(c);
+ if (have_cpuid_p()) {
+ cpu_detect(c);
+ get_cpu_vendor(c);
+ get_cpu_cap(c);
+
+ if (this_cpu->c_early_init)
+ this_cpu->c_early_init(c);
+
+ c->cpu_index = 0;
+ filter_cpuid_features(c, false);
+
+ if (this_cpu->c_bsp_init)
+ this_cpu->c_bsp_init(c);
+ }

setup_force_cpu_cap(X86_FEATURE_ALWAYS);
fpu__init_system(c);