powerpc: Remove fp_enable() and vec_enable(), use msr_check_and_{set, clear}()

More consolidation of our MSR available bit handling.

Signed-off-by: Anton Blanchard <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>

arch/powerpc/include/asm/processor.h

···
 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long adr);
 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
 
-extern void fp_enable(void);
-extern void vec_enable(void);
 extern void load_fp_state(struct thread_fp_state *fp);
 extern void store_fp_state(struct thread_fp_state *fp);
 extern void load_vr_state(struct thread_vr_state *vr);

arch/powerpc/kernel/fpu.S

···
 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
 
 /*
- * Enable use of the FPU, and VSX if possible, for the caller.
- */
-_GLOBAL(fp_enable)
-	mfmsr	r3
-	ori	r3,r3,MSR_FP
-#ifdef CONFIG_VSX
-BEGIN_FTR_SECTION
-	oris	r3,r3,MSR_VSX@h
-END_FTR_SECTION_IFSET(CPU_FTR_VSX)
-#endif
-	SYNC
-	MTMSRD(r3)
-	isync			/* (not necessary for arch 2.02 and later) */
-	blr
-
-/*
  * Load state from memory into FP registers including FPSCR.
  * Assumes the caller has enabled FP in the MSR.
  */

arch/powerpc/kernel/process.c

···
 	msr_diff = current->thread.ckpt_regs.msr & ~regs->msr;
 	msr_diff &= MSR_FP | MSR_VEC | MSR_VSX;
 	if (msr_diff & MSR_FP) {
-		fp_enable();
+		msr_check_and_set(MSR_FP);
 		load_fp_state(&current->thread.fp_state);
+		msr_check_and_clear(MSR_FP);
 		regs->msr |= current->thread.fpexc_mode;
 	}
 	if (msr_diff & MSR_VEC) {
-		vec_enable();
+		msr_check_and_set(MSR_VEC);
 		load_vr_state(&current->thread.vr_state);
+		msr_check_and_clear(MSR_VEC);
 	}
 	regs->msr |= msr_diff;
 }

arch/powerpc/kernel/vector.S

···
 #endif
 
 /*
- * Enable use of VMX/Altivec for the caller.
- */
-_GLOBAL(vec_enable)
-	mfmsr	r3
-	oris	r3,r3,MSR_VEC@h
-	MTMSRD(r3)
-	isync
-	blr
-
-/*
  * Load state from memory into VMX registers including VSCR.
  * Assumes the caller has enabled VMX in the MSR.
  */