s390/fpu: convert FPU CIF flag to regular TIF flag

The FPU state, as represented by the CIF_FPU flag reflects the FPU state of
a task, not the CPU it is running on. Therefore convert the flag to a
regular TIF flag.

This removes the magic in switch_to() where a save_fpu_regs() call for the
currently (previous) running task sets the per-cpu CIF_FPU flag, which is
required to restore FPU register contents of the next task, when it returns
to user space.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/arch/s390/kernel/fpu.c b/arch/s390/kernel/fpu.c
index 0a31408a46f3..12d6e9d97104 100644
--- a/arch/s390/kernel/fpu.c
+++ b/arch/s390/kernel/fpu.c
@@ -117,7 +117,7 @@ void __load_fpu_regs(void)
 		load_vx_regs(regs);
 	else
 		load_fp_regs(regs);
-	clear_cpu_flag(CIF_FPU);
+	clear_thread_flag(TIF_FPU);
 }
 
 void load_fpu_regs(void)
@@ -136,7 +136,7 @@ void save_fpu_regs(void)
 
 	local_irq_save(flags);
 
-	if (test_cpu_flag(CIF_FPU))
+	if (test_thread_flag(TIF_FPU))
 		goto out;
 
 	state = &current->thread.fpu;
@@ -147,7 +147,7 @@ void save_fpu_regs(void)
 		save_vx_regs(regs);
 	else
 		save_fp_regs(regs);
-	set_cpu_flag(CIF_FPU);
+	set_thread_flag(TIF_FPU);
 out:
 	local_irq_restore(flags);
 }