The current "WFI" opcode definiton causes CPU hot-plug feature fails to work
if the kernel is built with CONFIG_THUMB2_KERNEL/CONFIG_CPU_ENDIAN_BE8 being
defined. An invalid instruction exception will be generated.
Signed-off-by: yangfei.ker...@gmail.com
---
arch/arm/mach-exynos/hotplug.c | 8 +++++++-
arch/arm/mach-realview/hotplug.c | 8 +++++++-
arch/arm/mach-shmobile/hotplug.c | 8 +++++++-
3 files changed, 21 insertions(+), 3 deletions(-)
diff --git a/arch/arm/mach-exynos/hotplug.c b/arch/arm/mach-exynos/hotplug.c
index f4d7dd2..823a0e4 100644
--- a/arch/arm/mach-exynos/hotplug.c
+++ b/arch/arm/mach-exynos/hotplug.c
@@ -18,11 +18,17 @@
#include <asm/cacheflush.h>
#include <asm/cp15.h>
#include <asm/smp_plat.h>
+#include <asm/opcodes.h>
#include <mach/regs-pmu.h>
#include "common.h"
+/*
+ * Define opcode of the WFI instruction.
+ */
+#define __WFI __inst_arm_thumb16(0xe320f003, 0xbf30)
+
static inline void cpu_enter_lowpower(void)
{
unsigned int v;
@@ -72,7 +78,7 @@ static inline void platform_do_lowpower(unsigned int cpu, int
*spurious)
/*
* here's the WFI
*/
- asm(".word 0xe320f003\n"
+ asm(__WFI
:
:
: "memory", "cc");
diff --git a/arch/arm/mach-realview/hotplug.c b/arch/arm/mach-realview/hotplug.c
index 53818e5..5271a1a 100644
--- a/arch/arm/mach-realview/hotplug.c
+++ b/arch/arm/mach-realview/hotplug.c
@@ -15,6 +15,12 @@
#include <asm/cacheflush.h>
#include <asm/cp15.h>
#include <asm/smp_plat.h>
+#include <asm/opcodes.h>
+
+/*
+ * Define opcode of the WFI instruction.
+ */
+#define __WFI __inst_arm_thumb16(0xe320f003, 0xbf30)
static inline void cpu_enter_lowpower(void)
{
@@ -64,7 +70,7 @@ static inline void platform_do_lowpower(unsigned int cpu, int
*spurious)
/*
* here's the WFI
*/
- asm(".word 0xe320f003\n"
+ asm(__WFI
:
:
: "memory", "cc");
diff --git a/arch/arm/mach-shmobile/hotplug.c b/arch/arm/mach-shmobile/hotplug.c
index b09a0bd..0d7b7d1 100644
--- a/arch/arm/mach-shmobile/hotplug.c
+++ b/arch/arm/mach-shmobile/hotplug.c
@@ -20,6 +20,12 @@
#include <mach/emev2.h>
#include <asm/cacheflush.h>
#include <asm/mach-types.h>
+#include <asm/opcodes.h>
+
+/*
+ * Define opcode of the WFI instruction.
+ */
++#define __WFI __inst_arm_thumb16(0xe320f003, 0xbf30)
static cpumask_t dead_cpus;
@@ -39,7 +45,7 @@ void shmobile_cpu_die(unsigned int cpu)
/*
* here's the WFI
*/
- asm(".word 0xe320f003\n"
+ asm(__WFI
:
:
: "memory", "cc");
--
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
