On 12/02/2012 10:58 PM, Marek Vasut wrote:
Dear Rob Herring,
From: Rob Herring rob.herring@calxeda.com
Since wfi instruction is only available on ARMv7, add a conditional macro for it.
Signed-off-by: Rob Herring rob.herring@calxeda.com
arch/arm/include/asm/system.h | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h index 2b28a26..2f6aecd 100644 --- a/arch/arm/include/asm/system.h +++ b/arch/arm/include/asm/system.h @@ -61,6 +61,12 @@
#define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
+#ifdef __ARM_ARCH_7A__ +#define wfi() __asm__ __volatile__ ("wfi" : : : "memory") +#else +#define wfi() +#endif
Won't this break other (non-arm) systems? Moreover, maybe you can make this an (inline) function instead?
How? It is in an ARM specific header and empty on anything but ARMv7 enabled compiler. This follows the kernel implementation and the nop above.
Rob
static inline unsigned int get_cr(void) { unsigned int val;
Best regards, Marek Vasut