linux-kernel - [PATCH 1/1] SGI x86 UV: Update SCIR driver to use idle

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Date:	Mon, 27 Oct 2008 07:51:20 -0700
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Andi Kleen <andi@...stfloor.org>, Pavel Machek <pavel@...e.cz>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jack Steiner <steiner@....com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Richard Purdie <rpurdie@...ys.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/1] SGI x86 UV: Update SCIR driver to use idle_cpu function

Subject: SGI x86 UV: Update SCIR driver to use idle_cpu function

> Please send the cpu_idle() cleanup patch separately.

Change UV heartbeat function to use idle_cpu to determine cpu's
"idleness".  Realign uv_hub definitions.

Signed-of-by: Mike Travis <travis@....com>
---
 arch/x86/include/asm/uv/uv_hub.h |   26 +++++++++++++-------------
 arch/x86/kernel/genx2apic_uv_x.c |    4 ++--
 2 files changed, 15 insertions(+), 15 deletions(-)

--- test-tip-latest.orig/arch/x86/include/asm/uv/uv_hub.h
+++ test-tip-latest/arch/x86/include/asm/uv/uv_hub.h
@@ -128,19 +128,19 @@ struct uv_scir_s {
  * They are kept together in a struct to minimize cache misses.
  */
 struct uv_hub_info_s {
-	unsigned long	global_mmr_base;
-	unsigned long	gpa_mask;
-	unsigned long	gnode_upper;
-	unsigned long	lowmem_remap_top;
-	unsigned long	lowmem_remap_base;
-	unsigned short	pnode;
-	unsigned short	pnode_mask;
-	unsigned short	coherency_domain_number;
-	unsigned short	numa_blade_id;
-	unsigned char	blade_processor_id;
-	unsigned char	m_val;
-	unsigned char	n_val;
-	struct uv_scir_s scir;
+	unsigned long		global_mmr_base;
+	unsigned long		gpa_mask;
+	unsigned long		gnode_upper;
+	unsigned long		lowmem_remap_top;
+	unsigned long		lowmem_remap_base;
+	unsigned short		pnode;
+	unsigned short		pnode_mask;
+	unsigned short		coherency_domain_number;
+	unsigned short		numa_blade_id;
+	unsigned char		blade_processor_id;
+	unsigned char		m_val;
+	unsigned char		n_val;
+	struct uv_scir_s	scir;
 };
 
 DECLARE_PER_CPU(struct uv_hub_info_s, __uv_hub_info);
--- test-tip-latest.orig/arch/x86/kernel/genx2apic_uv_x.c
+++ test-tip-latest/arch/x86/kernel/genx2apic_uv_x.c
@@ -371,8 +371,8 @@ static void uv_heartbeat(unsigned long i
 	/* flip heartbeat bit */
 	bits ^= SCIR_CPU_HEARTBEAT;
 
-	/* are we the idle thread? */
-	if (current->pid == 0)
+	/* is this cpu idle? */
+	if (idle_cpu(smp_processor_id()))
 		bits &= ~SCIR_CPU_ACTIVITY;
 	else
 		bits |= SCIR_CPU_ACTIVITY;

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