linux-kernel - [tip:x86/cpu] x86, AMD: Remove needless CPU family check (for L3 cache info)

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Message-ID: <tip-d9fadd7ba99a67030783a212bcb17d11f0678433@git.kernel.org>
Date:	Sun, 5 Sep 2010 13:05:41 GMT
From:	tip-bot for Andreas Herrmann <andreas.herrmann3@....com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	andi@...stfloor.org, andreas.herrmann3@....com, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:x86/cpu] x86, AMD: Remove needless CPU family check (for L3 cache info)

Commit-ID:  d9fadd7ba99a67030783a212bcb17d11f0678433
Gitweb:     http://git.kernel.org/tip/d9fadd7ba99a67030783a212bcb17d11f0678433
Author:     Andreas Herrmann <andreas.herrmann3@....com>
AuthorDate: Thu, 2 Sep 2010 15:37:10 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Sun, 5 Sep 2010 14:33:48 +0200

x86, AMD: Remove needless CPU family check (for L3 cache info)

Old 32-bit AMD CPUs (all w/o L3 cache) should always return 0
for cpuid_edx(0x80000006).

For unknown reason the 32-bit implementation differed from the
64-bit implementation. See commit 67cddd94799 ("i386: Add L3 cache
support to AMD CPUID4 emulation"). The current check is the
result of the x86 merge.

Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com>
Cc: Andi Kleen <andi@...stfloor.org>
LKML-Reference: <20100902133710.GA5449@...e.amd.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 arch/x86/kernel/cpu/amd.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index fc563fa..0f0ace5 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -540,7 +540,7 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
 #endif
 
 	if (c->extended_cpuid_level >= 0x80000006) {
-		if ((c->x86 >= 0x0f) && (cpuid_edx(0x80000006) & 0xf000))
+		if (cpuid_edx(0x80000006) & 0xf000)
 			num_cache_leaves = 4;
 		else
 			num_cache_leaves = 3;
--
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