ARM: make get_current() and __my_cpu_offset() __always_inline

The get_current() and __my_cpu_offset() accessors evaluate to only a
single instruction emitted inline, but due to the size of the asm string
that is created for SMP+v6 configurations, the compiler assumes
otherwise, and may emit the functions out of line instead.

So use __always_inline to avoid this.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>

arch/arm/include/asm/current.h

@@ -14,7 +14,7 @@ struct task_struct;
 
 extern struct task_struct *__current;
 
-static inline __attribute_const__ struct task_struct *get_current(void)
+static __always_inline __attribute_const__ struct task_struct *get_current(void)
 {
 	struct task_struct *cur;
 

arch/arm/include/asm/percpu.h

@@ -25,7 +25,7 @@ static inline void set_my_cpu_offset(unsigned long off)
 	asm volatile("mcr p15, 0, %0, c13, c0, 4" : : "r" (off) : "memory");
 }
 
-static inline unsigned long __my_cpu_offset(void)
+static __always_inline unsigned long __my_cpu_offset(void)
 {
 	unsigned long off;