[PATCH 065/208] x86/fpu: Use 'struct fpu' in fpu_copy()

Ingo Molnar
2015-05-05T16:49:39Z

Migrate this function to pure 'struct fpu' usage.

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: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
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 92cee0c18dc6..cfc2af98bcde 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;
}
--
2.1.0