sched/idle: Optimize the generic idle loop

Currently, smp_processor_id() is used to fetch the current CPU in
cpu_idle_loop(). Every time the idle thread runs, it fetches the
current CPU using smp_processor_id().

Since the idle thread is per CPU, the current CPU is constant, so we
can lift the load out of the loop, saving execution cycles/time in the
loop.

x86-64:

Before patch (execution in loop):
	148:    0f ae e8                lfence
	14b:    65 8b 04 25 00 00 00 00 mov %gs:0x0,%eax
	152:    00
	153:    89 c0                   mov %eax,%eax
	155:    49 0f a3 04 24          bt %rax,(%r12)

After patch (execution in loop):
	150:    0f ae e8                lfence
	153:    4d 0f a3 34 24          bt %r14,(%r12)

ARM64:

Before patch (execution in loop):
	168:    d5033d9f        dsb     ld
	16c:    b9405661        ldr     w1,[x19,torvalds#84]
	170:    1100fc20        add     w0,w1,#0x3f
	174:    6b1f003f        cmp     w1,wzr
	178:    1a81b000        csel    w0,w0,w1,lt
	17c:    130c7000        asr     w0,w0,torvalds#6
	180:    937d7c00        sbfiz   x0,x0,#3,torvalds#32
	184:    f8606aa0        ldr     x0,[x21,x0]
	188:    9ac12401        lsr     x1,x0,x1
	18c:    36000e61        tbz     w1,#0,358

After patch (execution in loop):
	1a8:    d50339df        dsb     ld
	1ac:    f8776ac0        ldr     x0,[x22,x23]
	ab0:    ea18001f        tst     x0,x24
	1b4:    54000ea0        b.eq    388

Further observance on ARM64 for 4 seconds shows that cpu_idle_loop is
called 8672 times. Shifting the code will save instructions executed
in loop and eventually time as well.

Signed-off-by: Gaurav Jindal <gaurav.jindal@spreadtrum.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Sanjeev Yadav <sanjeev.yadav@spreadtrum.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20160512101330.GA488@gauravjindalubtnb.del.spreadtrum.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

kernel/sched/idle.c

@@ -201,6 +201,8 @@ static void cpuidle_idle_call(void)
  */
 static void cpu_idle_loop(void)
 {
+	int cpu = smp_processor_id();
+
 	while (1) {
 		/*
 		 * If the arch has a polling bit, we maintain an invariant:
@@ -219,7 +221,7 @@ static void cpu_idle_loop(void)
 			check_pgt_cache();
 			rmb();
 
-			if (cpu_is_offline(smp_processor_id())) {
+			if (cpu_is_offline(cpu)) {
 				cpuhp_report_idle_dead();
 				arch_cpu_idle_dead();
 			}