x86/fpu: Pass 'struct fpu' to fpu__restore()

This cleans up the call sites and the function a bit,
and also makes it more symmetric with the other high
level FPU state handling functions.

It's still only valid for the current task, as we copy
to the FPU registers of the current CPU.

No change in functionality.

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
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>

1 files changed, 3 insertions, 6 deletions

diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index d67558cdbddd..c0661604a258 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -343,11 +343,8 @@ void fpu__activate_stopped(struct fpu *child_fpu)
  * with local interrupts disabled, as it is in the case of
  * do_device_not_available()).
  */
-void fpu__restore(void)
+void fpu__restore(struct fpu *fpu)
 {
-	struct task_struct *tsk = current;
-	struct fpu *fpu = &tsk->thread.fpu;
-
 	fpu__activate_curr(fpu);
 
 	/* Avoid __kernel_fpu_begin() right after fpregs_activate() */
@@ -355,9 +352,9 @@ void fpu__restore(void)
 	fpregs_activate(fpu);
 	if (unlikely(copy_fpstate_to_fpregs(fpu))) {
 		fpu__clear(fpu);
-		force_sig_info(SIGSEGV, SEND_SIG_PRIV, tsk);
+		force_sig_info(SIGSEGV, SEND_SIG_PRIV, current);
 	} else {
-		tsk->thread.fpu.counter++;
+		fpu->counter++;
 	}
 	kernel_fpu_enable();
 }