arm: Handle KCOV __init vs inline mismatches

When KCOV is enabled all functions get instrumented, unless
the __no_sanitize_coverage attribute is used. To prepare for
__no_sanitize_coverage being applied to __init functions, we have to
handle differences in how GCC's inline optimizations get resolved. For
arm this exposed several places where __init annotations were missing
but ended up being "accidentally correct". Fix these cases and force
several functions to be inline with __always_inline.

Acked-by: Nishanth Menon <[e-mail]>
Acked-by: Lee Jones <[e-mail]>
Reviewed-by: Nishanth Menon <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Kees Cook <[e-mail]>

arch/arm/mm/cache-feroceon-l2.c

···
 	return u;
 }
 
-static inline void write_extra_features(u32 u)
+static inline void __init write_extra_features(u32 u)
 {
 	__asm__("mcr p15, 1, %0, c15, c1, 0" : : "r" (u));
 }

arch/arm/mm/cache-tauros2.c

···
 	__asm__("mcr p15, 0, %0, c1, c0, 1\n" : : "r" (actlr));
 }
 
-static void enable_extra_feature(unsigned int features)
+static void __init enable_extra_feature(unsigned int features)
 {
 	u32 u;
 

drivers/clocksource/timer-orion.c

···
 	.read_current_timer = orion_read_timer,
 };
 
-static void orion_delay_timer_init(unsigned long rate)
+static void __init orion_delay_timer_init(unsigned long rate)
 {
 	orion_delay_timer.freq = rate;
 	register_current_timer_delay(&orion_delay_timer);

drivers/soc/ti/pm33xx.c

···
 	return pm_ops->cpu_suspend(am33xx_do_wfi_sram, wfi_flags);
 }
 
-static int __init am43xx_map_gic(void)
+static int am43xx_map_gic(void)
 {
 	gic_dist_base = ioremap(AM43XX_GIC_DIST_BASE, SZ_4K);
 

include/linux/mfd/dbx500-prcmu.h

···
 
 #if defined(CONFIG_UX500_SOC_DB8500)
 
-static inline void prcmu_early_init(void)
+static inline void __init prcmu_early_init(void)
 {
 	db8500_prcmu_early_init();
 }