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ARM: 7029/1: Make cpu_architecture into a global variable

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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>
This commit is contained in:
Dave Martin 2011-08-19 17:58:35 +01:00 • committed by Russell King
parent 40c6d8aee4
commit 2ecccf90f2
2 changed files with 21 additions and 2 deletions
arch/arm
include/asm
system.h
kernel
setup.c

3
arch/arm/include/asm/system.h
View file

@ -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);

20
arch/arm/kernel/setup.c
View file

@ -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;