Hello Wenyou,

On Tue, Jan 27, 2015 at 01:57:27PM +0800, Wenyou Yang wrote:

 
 static void __init at91_pm_init(void)
 {
-#ifdef CONFIG_AT91_SLOW_CLOCK
 	at91_pm_sram_init();
-#endif
 
 	pr_info("AT91: Power Management%s\n", (slow_clock ? " (with slow clock mode)" : ""));

Details, but the ternary operation can be removed here, slow_clock now 
defines whether we have PM support at all, not whether we have 
slow_clock mode available.

Maybe we should not even display this message on the console if we 
failed to allocate sram for slow_clock, we already fired a message 
saying that PM is not available at all in at91_pm_sram_init().

Sylvain