linux-kernel - [PATCH 02/13 UPDATED] x86: make early_per

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Date:	Tue, 13 Jan 2009 20:43:29 +0900
From:	Tejun Heo <tj@...nel.org>
To:	ebiederm@...ssion.com, cl@...ux-foundation.org,
	rusty@...tcorp.com.au, mingo@...e.hu, travis@....com,
	linux-kernel@...r.kernel.org, hpa@...or.com,
	akpm@...ux-foundation.org, steiner@....com, hugh@...itas.com
Subject: [PATCH 02/13 UPDATED] x86: make early_per_cpu() a lvalue and use
 it

Make early_per_cpu() a lvalue as per_cpu() is and use it where
applicable.

Meriusz spotted that early_per_cpu() conversion in topology.h was
missing @cpu argument.  Fixed.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Mariusz Ceier <mceier@...il.com>
---
git tree has been regenerated accordingly.

Thanks.

 arch/x86/include/asm/percpu.h   |    6 +++---
 arch/x86/include/asm/topology.h |    5 +----
 arch/x86/kernel/apic.c          |   13 ++-----------
 3 files changed, 6 insertions(+), 18 deletions(-)

Index: work/arch/x86/include/asm/topology.h
===================================================================
--- work.orig/arch/x86/include/asm/topology.h
+++ work/arch/x86/include/asm/topology.h
@@ -96,10 +96,7 @@ static inline int cpu_to_node(int cpu)
 /* Same function but used if called before per_cpu areas are setup */
 static inline int early_cpu_to_node(int cpu)
 {
-	if (early_per_cpu_ptr(x86_cpu_to_node_map))
-		return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
-
-	return per_cpu(x86_cpu_to_node_map, cpu);
+	return early_per_cpu(x86_cpu_to_node_map, cpu);
 }
 
 /* Returns a pointer to the cpumask of CPUs on Node 'node'. */
Index: work/arch/x86/kernel/apic.c
===================================================================
--- work.orig/arch/x86/kernel/apic.c
+++ work/arch/x86/kernel/apic.c
@@ -1865,17 +1865,8 @@ void __cpuinit generic_processor_info(in
 #endif
 
 #if defined(CONFIG_X86_SMP) || defined(CONFIG_X86_64)
-	/* are we being called early in kernel startup? */
-	if (early_per_cpu_ptr(x86_cpu_to_apicid)) {
-		u16 *cpu_to_apicid = early_per_cpu_ptr(x86_cpu_to_apicid);
-		u16 *bios_cpu_apicid = early_per_cpu_ptr(x86_bios_cpu_apicid);
-
-		cpu_to_apicid[cpu] = apicid;
-		bios_cpu_apicid[cpu] = apicid;
-	} else {
-		per_cpu(x86_cpu_to_apicid, cpu) = apicid;
-		per_cpu(x86_bios_cpu_apicid, cpu) = apicid;
-	}
+	early_per_cpu(x86_cpu_to_apicid, cpu) = apicid;
+	early_per_cpu(x86_bios_cpu_apicid, cpu) = apicid;
 #endif
 
 	cpu_set(cpu, cpu_possible_map);
Index: work/arch/x86/include/asm/percpu.h
===================================================================
--- work.orig/arch/x86/include/asm/percpu.h
+++ work/arch/x86/include/asm/percpu.h
@@ -195,9 +195,9 @@ do {							\
 #define	early_per_cpu_ptr(_name) (_name##_early_ptr)
 #define	early_per_cpu_map(_name, _idx) (_name##_early_map[_idx])
 #define	early_per_cpu(_name, _cpu) 				\
-	(early_per_cpu_ptr(_name) ?				\
-		early_per_cpu_ptr(_name)[_cpu] :		\
-		per_cpu(_name, _cpu))
+	*(early_per_cpu_ptr(_name) ?				\
+		&early_per_cpu_ptr(_name)[_cpu] :		\
+		&per_cpu(_name, _cpu))
 
 #else	/* !CONFIG_SMP */
 #define	DEFINE_EARLY_PER_CPU(_type, _name, _initvalue)		\
--
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