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[PATCH] x86/cpu: Probe CPUID leaf 6 even when cpuid_level == 6

From Andy Lutomirski <luto@kernel.org>
Newsgroups linux.kernel
Subject [PATCH] x86/cpu: Probe CPUID leaf 6 even when cpuid_level == 6
Date 2016-12-15 19:20 +0100
Message-ID <sOINk-G7-5@gated-at.bofh.it> (permalink)
Organization linux.* mail to news gateway

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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@kernel.org>
---

I don't know what CPUs, if any, are affected, and the bug is minor anyway,
so the major advantage of applying this is to remove a head-scratcher when
reading the code, I think.

 arch/x86/kernel/cpu/common.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index cc9e980c68ec..d61722821b7b 100644
--- 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;
 	}
 
-- 
2.9.3

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Thread

[PATCH] x86/cpu: Probe CPUID leaf 6 even when cpuid_level == 6 Andy Lutomirski <luto@kernel.org> - 2016-12-15 19:20 +0100
  Re: [PATCH] x86/cpu: Probe CPUID leaf 6 even when cpuid_level == 6 Borislav Petkov <bp@alien8.de> - 2016-12-15 20:20 +0100
  [tip:x86/urgent] x86/cpu: Probe CPUID leaf 6 even when cpuid_level  == 6 tip-bot for Andy Lutomirski <tipbot@zytor.com> - 2016-12-19 12:00 +0100
    Re: [tip:x86/urgent] x86/cpu: Probe CPUID leaf 6 even when  cpuid_level == 6 "H. Peter Anvin" <hpa@zytor.com> - 2016-12-20 08:10 +0100
      Re: [tip:x86/urgent] x86/cpu: Probe CPUID leaf 6 even when cpuid_level  == 6 Thomas Gleixner <tglx@linutronix.de> - 2016-12-20 10:40 +0100

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