MIPS: Annotate cpu_wait implementations with __cpuidle

Annotate cpu_wait implementations using the __cpuidle macro which
places these functions in the .cpuidle.text section. This allows
cpu_in_idle() to return true for PC values which fall within these
functions, allowing nmi_backtrace() to produce cleaner output for CPUs
running idle functions. For example:

# echo l >/proc/sysrq-trigger
[ 38.587170] sysrq: SysRq : Show backtrace of all active CPUs
[ 38.593657] NMI backtrace for cpu 1
[ 38.597611] CPU: 1 PID: 161 Comm: sh Not tainted 4.18.0-rc1+ #27
[ 38.604306] Stack : 00000000 00000004 00000006 80486724 00000000 00000000 00000000 00000000
[ 38.613647] 80e17eda 00000034 00000000 00000000 80d20000 80b67e98 8e559c90 0ffe1e88
[ 38.622986] 00000000 00000000 80e70000 00000000 8f61db18 38312e34 722d302e 202b3163
[ 38.632324] 8e559d3c 8e559adc 00000001 6b636162 80d20000 80000000 00000000 80d1cfa4
[ 38.641664] 00000001 80d20000 80d19520 00000000 00000003 80836724 00000004 80e10004
[ 38.650993] ...
[ 38.653724] Call Trace:
[ 38.656499] [<8040cdd0>] show_stack+0xa0/0x144
[ 38.661475] [<80b67e98>] dump_stack+0xe8/0x120
[ 38.666455] [<80b6f6d4>] nmi_cpu_backtrace+0x1b4/0x1cc
[ 38.672189] [<80b6f81c>] nmi_trigger_cpumask_backtrace+0x130/0x1e4
[ 38.679081] [<808295d8>] __handle_sysrq+0xc0/0x180
[ 38.684421] [<80829b84>] write_sysrq_trigger+0x50/0x64
[ 38.690176] [<8061c984>] proc_reg_write+0xd0/0xfc
[ 38.695447] [<805aac1c>] __vfs_write+0x54/0x194
[ 38.700500] [<805aaf24>] vfs_write+0xe0/0x18c
[ 38.705360] [<805ab190>] ksys_write+0x7c/0xf0
[ 38.710238] [<80416018>] syscall_common+0x34/0x58
[ 38.715558] Sending NMI from CPU 1 to CPUs 0,2-3:
[ 38.720916] NMI backtrace for cpu 0 skipped: idling at r4k_wait_irqoff+0x2c/0x34
[ 38.729186] NMI backtrace for cpu 3 skipped: idling at r4k_wait_irqoff+0x2c/0x34
[ 38.737449] NMI backtrace for cpu 2 skipped: idling at r4k_wait_irqoff+0x2c/0x34

Without this we get register value & backtrace output from all CPUs,
which is generally useless for those running the idle function & serves
only to overwhelm & obfuscate the meaningful output from non-idle CPUs.

Signed-off-by: Paul Burton <[e-mail]>
Cc: James Hogan <[e-mail]>
Cc: Ralf Baechle <[e-mail]>
Cc: Huacai Chen <[e-mail]>
Cc: [e-mail]
Patchwork: https://patchwork.linux-mips.org/patch/19598/

arch/mips/kernel/idle.c

···
 void (*cpu_wait)(void);
 EXPORT_SYMBOL(cpu_wait);
 
-static void r3081_wait(void)
+static void __cpuidle r3081_wait(void)
 {
 	unsigned long cfg = read_c0_conf();
 	write_c0_conf(cfg | R30XX_CONF_HALT);
 	local_irq_enable();
 }
 
-static void r39xx_wait(void)
+static void __cpuidle r39xx_wait(void)
 {
 	if (!need_resched())
 		write_c0_conf(read_c0_conf() | TX39_CONF_HALT);
 	local_irq_enable();
 }
 
-void r4k_wait(void)
+void __cpuidle r4k_wait(void)
 {
 	local_irq_enable();
 	__r4k_wait();
···
  * interrupt is requested" restriction in the MIPS32/MIPS64 architecture makes
  * using this version a gamble.
  */
-void r4k_wait_irqoff(void)
+void __cpuidle r4k_wait_irqoff(void)
 {
 	if (!need_resched())
 		__asm__(
···
  * The RM7000 variant has to handle erratum 38.	 The workaround is to not
  * have any pending stores when the WAIT instruction is executed.
  */
-static void rm7k_wait_irqoff(void)
+static void __cpuidle rm7k_wait_irqoff(void)
 {
 	if (!need_resched())
 		__asm__(
···
  * since coreclock (and the cp0 counter) stops upon executing it. Only an
  * interrupt can wake it, so they must be enabled before entering idle modes.
  */
-static void au1k_wait(void)
+static void __cpuidle au1k_wait(void)
 {
 	unsigned long c0status = read_c0_status() | 1;	/* irqs on */
 

arch/mips/vr41xx/common/pmu.c

···
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
+#include <linux/cpu.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/ioport.h>
···
 #define pmu_read(offset)		readw(pmu_base + (offset))
 #define pmu_write(offset, value)	writew((value), pmu_base + (offset))
 
-static void vr41xx_cpu_wait(void)
+static void __cpuidle vr41xx_cpu_wait(void)
 {
 	local_irq_disable();
 	if (!need_resched())