s390/kernel: remove save_fpu_regs() parameter and use __LC_CURRENT instead

All calls to save_fpu_regs() specify the fpu structure of the current task
pointer as parameter.  The task pointer of the current task can also be
retrieved from the CPU lowcore directly.  Remove the parameter definition,
load the __LC_CURRENT task pointer from the CPU lowcore, and rebase the FPU
structure onto the task structure.  Apply the same approach for the
load_fpu_regs() function.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/include/asm/fpu-internal.h b/arch/s390/include/asm/fpu-internal.h
index 237f8fc..55dc2c0 100644 (file)
--- a/arch/s390/include/asm/fpu-internal.h
+++ b/arch/s390/include/asm/fpu-internal.h
@@ -28,7 +28,7 @@ struct fpu {
        };
 };
 
-void save_fpu_regs(struct fpu *fpu);
+void save_fpu_regs(void);
 
 #define is_vx_fpu(fpu) (!!((fpu)->flags & FPU_USE_VX))
 #define is_vx_task(tsk) (!!((tsk)->thread.fpu.flags & FPU_USE_VX))

diff --git a/arch/s390/include/asm/switch_to.h b/arch/s390/include/asm/switch_to.h
index 0a4a315..dcadfde 100644 (file)
--- a/arch/s390/include/asm/switch_to.h
+++ b/arch/s390/include/asm/switch_to.h
@@ -30,7 +30,7 @@ static inline void restore_access_regs(unsigned int *acrs)
 
 #define switch_to(prev,next,last) do {                                 \
        if (prev->mm) {                                                 \
-               save_fpu_regs(&prev->thread.fpu);                       \
+               save_fpu_regs();                                        \
                save_access_regs(&prev->thread.acrs[0]);                \
                save_ri_cb(prev->thread.ri_cb);                         \
        }                                                               \

diff --cc arch/s390/kernel/asm-offsets.c
Simple merge

diff --cc arch/s390/kernel/compat_signal.c
Simple merge

diff --cc arch/s390/kernel/entry.S
Simple merge

diff --cc arch/s390/kernel/process.c
Simple merge

diff --cc arch/s390/kernel/ptrace.c
Simple merge

diff --cc arch/s390/kernel/signal.c
Simple merge

diff --cc arch/s390/kernel/traps.c
Simple merge

diff --cc arch/s390/kvm/kvm-s390.c
Simple merge