x86/fpu: Rename fpu_finit() to fpstate_init()

Make it clear that we are initializing the in-memory FPU context area,
no the FPU registers.

Also move it to the fpu__*() namespace.

Reviewed-by: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/include/asm/i387.h

@@ -19,8 +19,8 @@ struct pt_regs;
 struct user_i387_struct;
 
 extern int fpstate_alloc_init(struct task_struct *curr);
+extern void fpstate_init(struct fpu *fpu);
 
-extern void fpu_finit(struct fpu *fpu);
 extern int dump_fpu(struct pt_regs *, struct user_i387_struct *);
 extern void math_state_restore(void);
 

arch/x86/kernel/i387.c

@@ -225,7 +225,7 @@ void fpu_init(void)
 	eager_fpu_init();
 }
 
-void fpu_finit(struct fpu *fpu)
+void fpstate_init(struct fpu *fpu)
 {
 	if (!cpu_has_fpu) {
 		finit_soft_fpu(&fpu->state->soft);
@@ -244,7 +244,7 @@ void fpu_finit(struct fpu *fpu)
 		fp->fos = 0xffff0000u;
 	}
 }
-EXPORT_SYMBOL_GPL(fpu_finit);
+EXPORT_SYMBOL_GPL(fpstate_init);
 
 int fpstate_alloc(struct fpu *fpu)
 {
@@ -284,7 +284,7 @@ int fpstate_alloc_init(struct task_struct *curr)
 	if (ret)
 		return ret;
 
-	fpu_finit(&curr->thread.fpu);
+	fpstate_init(&curr->thread.fpu);
 
 	/* Safe to do for the current task: */
 	curr->flags |= PF_USED_MATH;
@@ -318,7 +318,7 @@ static int fpu__unlazy_stopped(struct task_struct *child)
 	if (ret)
 		return ret;
 
-	fpu_finit(&child->thread.fpu);
+	fpstate_init(&child->thread.fpu);
 
 	/* Safe to do for stopped child tasks: */
 	child->flags |= PF_USED_MATH;

arch/x86/kernel/xsave.c

@@ -395,7 +395,7 @@ int __restore_xstate_sig(void __user *buf, void __user *buf_fx, int size)
 
 		if (__copy_from_user(&fpu->state->xsave, buf_fx, state_size) ||
 		    __copy_from_user(&env, buf, sizeof(env))) {
-			fpu_finit(fpu);
+			fpstate_init(fpu);
 			err = -1;
 		} else {
 			sanitize_restored_xstate(tsk, &env, xstate_bv, fx_only);

arch/x86/kvm/x86.c

@@ -7011,7 +7011,7 @@ int fx_init(struct kvm_vcpu *vcpu)
 	if (err)
 		return err;
 
-	fpu_finit(&vcpu->arch.guest_fpu);
+	fpstate_init(&vcpu->arch.guest_fpu);
 	if (cpu_has_xsaves)
 		vcpu->arch.guest_fpu.state->xsave.xsave_hdr.xcomp_bv =
 			host_xcr0 | XSTATE_COMPACTION_ENABLED;