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ARM: SWP emulation: only initialise on ARMv7 CPUs

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Previous CPUs do not have the ability to trap SWP instructions, so
it's pointless initialising this code there.

Tested-by: Tony Lindgren <tony@atomide.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2014-07-04 14:49:05 +01:00
parent a11dd731f5
commit 7397aa48ff
1 changed files with 4 additions and 0 deletions
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4
arch/arm/kernel/swp_emulate.c
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@ -27,6 +27,7 @@
#include <linux/perf_event.h>
#include <asm/opcodes.h>
#include <asm/system_info.h>
#include <asm/traps.h>
#include <asm/uaccess.h>
@ -266,6 +267,9 @@ static struct undef_hook swp_hook = {
*/
static int __init swp_emulation_init(void)
{
if (cpu_architecture() < CPU_ARCH_ARMv7)
return 0;
#ifdef CONFIG_PROC_FS
if (!proc_create("cpu/swp_emulation", S_IRUGO, NULL, &proc_status_fops))
return -ENOMEM;