powerpc/kernel: Make function __giveup_fpu() static

__giveup_fpu() is never called outside process.c, so it can be static.
That also means we don't need an empty definition in switch_to.h

Signed-off-by: Mathieu Malaterre <malat@debian.org>
[mpe: Also drop the empty version, rewrite change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/switch_to.h

@@ -35,7 +35,6 @@ static inline void disable_kernel_fp(void)
 	msr_check_and_clear(MSR_FP);
 }
 #else
-static inline void __giveup_fpu(struct task_struct *t) { }
 static inline void save_fpu(struct task_struct *t) { }
 static inline void flush_fp_to_thread(struct task_struct *t) { }
 #endif

arch/powerpc/kernel/process.c

@@ -173,7 +173,7 @@ void __msr_check_and_clear(unsigned long bits)
 EXPORT_SYMBOL(__msr_check_and_clear);
 
 #ifdef CONFIG_PPC_FPU
-void __giveup_fpu(struct task_struct *tsk)
+static void __giveup_fpu(struct task_struct *tsk)
 {
 	unsigned long msr;
 
@@ -556,7 +556,7 @@ void restore_math(struct pt_regs *regs)
 	regs->msr = msr;
 }
 
-void save_all(struct task_struct *tsk)
+static void save_all(struct task_struct *tsk)
 {
 	unsigned long usermsr;