x86: replace percpu_xxx funcs with this_cpu_xxx

Since percpu_xxx() serial functions are duplicated with this_cpu_xxx().
Removing percpu_xxx() definition and replacing them by this_cpu_xxx()
in code. There is no function change in this patch, just preparation for
later percpu_xxx serial function removing.

On x86 machine the this_cpu_xxx() serial functions are same as
__this_cpu_xxx() without no unnecessary premmpt enable/disable.

Thanks for Stephen Rothwell, he found and fixed a i386 build error in
the patch.

Also thanks for Andrew Morton, he kept updating the patchset in Linus'
tree.

Signed-off-by: Alex Shi <alex.shi@intel.com>
Acked-by: Christoph Lameter <cl@gentwo.org>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/arch/x86/include/asm/fpu-internal.h b/arch/x86/include/asm/fpu-internal.h
index 4fa88154e4de..75f4c6d6a331 100644
--- a/arch/x86/include/asm/fpu-internal.h
+++ b/arch/x86/include/asm/fpu-internal.h
@@ -290,14 +290,14 @@ static inline int __thread_has_fpu(struct task_struct *tsk)
 static inline void __thread_clear_has_fpu(struct task_struct *tsk)
 {
 	tsk->thread.fpu.has_fpu = 0;
-	percpu_write(fpu_owner_task, NULL);
+	this_cpu_write(fpu_owner_task, NULL);
 }
 
 /* Must be paired with a 'clts' before! */
 static inline void __thread_set_has_fpu(struct task_struct *tsk)
 {
 	tsk->thread.fpu.has_fpu = 1;
-	percpu_write(fpu_owner_task, tsk);
+	this_cpu_write(fpu_owner_task, tsk);
 }
 
 /*
@@ -344,7 +344,7 @@ typedef struct { int preload; } fpu_switch_t;
  */
 static inline int fpu_lazy_restore(struct task_struct *new, unsigned int cpu)
 {
-	return new == percpu_read_stable(fpu_owner_task) &&
+	return new == this_cpu_read_stable(fpu_owner_task) &&
 		cpu == new->thread.fpu.last_cpu;
 }