linux-kernel - [tip:sched/urgent] sched/x86: Use cpu_llc_shared_mask(cpu) for coregroup

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Date:	Wed, 30 May 2012 06:35:23 -0700
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	andreas.herrmann3@....com, a.p.zijlstra@...llo.nl, efault@....de,
	bp@...64.org, tglx@...utronix.de
Subject: [tip:sched/urgent] sched/x86: Use cpu_llc_shared_mask(cpu)
  for coregroup_mask

Commit-ID:  9f646389aa7727a2fd8f9ae6337b92af9cfbc264
Gitweb:     http://git.kernel.org/tip/9f646389aa7727a2fd8f9ae6337b92af9cfbc264
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Tue, 29 May 2012 16:39:09 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 30 May 2012 11:05:44 +0200

sched/x86: Use cpu_llc_shared_mask(cpu) for coregroup_mask

Commit commit 8e7fbcbc2 ("sched: Remove stale power aware scheduling
remnants and dysfunctional knobs") made a boo-boo with removing the
power aware scheduling muck from the x86 topology bits.

We should unconditionally use the llc_shared mask for multi-core.

Reported-and-tested-by: Mike Galbraith <efault@....de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Borislav Petkov <bp@...64.org>
Cc: Andreas Herrmann <andreas.herrmann3@....com>
Link: http://lkml.kernel.org/n/tip-lsksc2kfyeveb13avh327p0d@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/smpboot.c |   10 +---------
 1 files changed, 1 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index f56f96d..fd019d7 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -410,15 +410,7 @@ void __cpuinit set_cpu_sibling_map(int cpu)
 /* maps the cpu to the sched domain representing multi-core */
 const struct cpumask *cpu_coregroup_mask(int cpu)
 {
-	struct cpuinfo_x86 *c = &cpu_data(cpu);
-	/*
-	 * For perf, we return last level cache shared map.
-	 * And for power savings, we return cpu_core_map
-	 */
-	if (!(cpu_has(c, X86_FEATURE_AMD_DCM)))
-		return cpu_core_mask(cpu);
-	else
-		return cpu_llc_shared_mask(cpu);
+	return cpu_llc_shared_mask(cpu);
 }
 
 static void impress_friends(void)
--
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