[tip:x86/fpu] x86/fpu: Use 'struct fpu' in fpu_copy()

[tip-bot for Ingo Molnar <tipbot@xxxxxxxxx>]

Commit-ID:  f9bc977fe734772a7ca4a467fe4fd74e1ea3a849
Gitweb:     http://git.kernel.org/tip/f9bc977fe734772a7ca4a467fe4fd74e1ea3a849
Author:     Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate: Fri, 24 Apr 2015 02:07:33 +0200
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 19 May 2015 15:47:28 +0200

x86/fpu: Use 'struct fpu' in fpu_copy()

Migrate this function to pure 'struct fpu' usage.

Reviewed-by: Borislav Petkov <bp@xxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 arch/x86/kernel/fpu/core.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index b685e9e..9aaba6a 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -227,15 +227,12 @@ EXPORT_SYMBOL_GPL(fpstate_free);
  * In the 'lazy' case we save to the source context, mark the FPU lazy
  * via stts() and copy the source context into the destination context.
  */
-static void fpu_copy(struct task_struct *dst, struct task_struct *src)
+static void fpu_copy(struct fpu *dst_fpu, struct fpu *src_fpu)
 {
-	struct fpu *dst_fpu = &dst->thread.fpu;
-	struct fpu *src_fpu = &src->thread.fpu;
-
-	WARN_ON(src != current);
+	WARN_ON(src_fpu != &current->thread.fpu);
 
 	if (use_eager_fpu()) {
-		memset(&dst->thread.fpu.state->xsave, 0, xstate_size);
+		memset(&dst_fpu->state->xsave, 0, xstate_size);
 		__save_fpu(dst_fpu);
 	} else {
 		fpu__save(src_fpu);
@@ -258,7 +255,7 @@ int fpu__copy(struct task_struct *dst, struct task_struct *src)
 
 		if (err)
 			return err;
-		fpu_copy(dst, src);
+		fpu_copy(dst_fpu, src_fpu);
 	}
 	return 0;
 }
--
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