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authorDave Martin <dave.martin@linaro.org>2011-08-19 17:58:35 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-10-17 09:12:40 +0100
commit2ecccf90f2a6d821af4d33f086d59895e5d3bedc (patch)
treed12438e595a0cfa5051187f69a1badddb1b317b3 /arch/arm
parent40c6d8aee40e373db75e6b0b4230fc8e8259d7a6 (diff)
ARM: 7029/1: Make cpu_architecture into a global variable
The CPU architecture really should not be changing at runtime, so make it a global variable instead of a function. The cpu_architecture() function declared in <asm/system.h> remains the correct way to read this variable from C code. Signed-off-by: Dave Martin <dave.martin@linaro.org> Reviewed-by: Jon Medhurst <tixy@yxit.co.uk> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/include/asm/system.h3
-rw-r--r--arch/arm/kernel/setup.c20
2 files changed, 21 insertions, 2 deletions
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 832888d0c20..4adf71b2b54 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -57,6 +57,7 @@
#ifndef __ASSEMBLY__
+#include <linux/compiler.h>
#include <linux/linkage.h>
#include <linux/irqflags.h>
@@ -104,7 +105,7 @@ struct mm_struct;
extern void show_pte(struct mm_struct *mm, unsigned long addr);
extern void __show_regs(struct pt_regs *);
-extern int cpu_architecture(void);
+extern int __pure cpu_architecture(void);
extern void cpu_init(void);
void arm_machine_restart(char mode, const char *cmd);
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index e514c76043b..10fce616e99 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -29,6 +29,8 @@
#include <linux/fs.h>
#include <linux/proc_fs.h>
#include <linux/memblock.h>
+#include <linux/bug.h>
+#include <linux/compiler.h>
#include <asm/unified.h>
#include <asm/cpu.h>
@@ -42,6 +44,7 @@
#include <asm/cacheflush.h>
#include <asm/cachetype.h>
#include <asm/tlbflush.h>
+#include <asm/system.h>
#include <asm/prom.h>
#include <asm/mach/arch.h>
@@ -115,6 +118,13 @@ struct outer_cache_fns outer_cache __read_mostly;
EXPORT_SYMBOL(outer_cache);
#endif
+/*
+ * Cached cpu_architecture() result for use by assembler code.
+ * C code should use the cpu_architecture() function instead of accessing this
+ * variable directly.
+ */
+int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN;
+
struct stack {
u32 irq[3];
u32 abt[3];
@@ -210,7 +220,7 @@ static const char *proc_arch[] = {
"?(17)",
};
-int cpu_architecture(void)
+static int __get_cpu_architecture(void)
{
int cpu_arch;
@@ -243,6 +253,13 @@ int cpu_architecture(void)
return cpu_arch;
}
+int __pure cpu_architecture(void)
+{
+ BUG_ON(__cpu_architecture == CPU_ARCH_UNKNOWN);
+
+ return __cpu_architecture;
+}
+
static int cpu_has_aliasing_icache(unsigned int arch)
{
int aliasing_icache;
@@ -414,6 +431,7 @@ static void __init setup_processor(void)
}
cpu_name = list->cpu_name;
+ __cpu_architecture = __get_cpu_architecture();
#ifdef MULTI_CPU
processor = *list->proc;