This is a note to let you know that I've just added the patch titled
x86/cpu: Probe CPUID leaf 6 even when cpuid_level == 6
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-cpu-probe-cpuid-leaf-6-even-when-cpuid_level-6.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3df8d9208569ef0b2313e516566222d745f3b94b Mon Sep 17 00:00:00 2001
From: Andy Lutomirski <luto@xxxxxxxxxx>
Date: Thu, 15 Dec 2016 10:14:42 -0800
Subject: x86/cpu: Probe CPUID leaf 6 even when cpuid_level == 6
From: Andy Lutomirski <luto@xxxxxxxxxx>
commit 3df8d9208569ef0b2313e516566222d745f3b94b upstream.
A typo (or mis-merge?) resulted in leaf 6 only being probed if
cpuid_level >= 7.
Fixes: 2ccd71f1b278 ("x86/cpufeature: Move some of the scattered feature bits to x86_capability")
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
Acked-by: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Link: http://lkml.kernel.org/r/6ea30c0e9daec21e488b54761881a6dfcf3e04d0.1481825597.git.luto@xxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/cpu/common.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -667,13 +667,14 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
c->x86_capability[CPUID_1_EDX] = edx;
}
+ /* Thermal and Power Management Leaf: level 0x00000006 (eax) */
+ if (c->cpuid_level >= 0x00000006)
+ c->x86_capability[CPUID_6_EAX] = cpuid_eax(0x00000006);
+
/* Additional Intel-defined flags: level 0x00000007 */
if (c->cpuid_level >= 0x00000007) {
cpuid_count(0x00000007, 0, &eax, &ebx, &ecx, &edx);
-
c->x86_capability[CPUID_7_0_EBX] = ebx;
-
- c->x86_capability[CPUID_6_EAX] = cpuid_eax(0x00000006);
c->x86_capability[CPUID_7_ECX] = ecx;
}
Patches currently in stable-queue which might be from luto@xxxxxxxxxx are
queue-4.9/x86-cpu-probe-cpuid-leaf-6-even-when-cpuid_level-6.patch
queue-4.9/x86-prctl-uapi-remove-ifdef-for-checkpoint_restore.patch
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