s390/fpu: change type of fpu mask from u32 to int

Change type of fpu mask consistently from u32 to int. This is a
prerequisite to make the kernel fpu usage preemptible. Upcoming code
uses __atomic* ops which work with int pointers.

Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

arch/s390/include/asm/fpu-types.h

@@ -24,7 +24,7 @@ struct fpu {
 
 /* In-kernel FPU state structure */
 struct kernel_fpu {
-	u32	    mask;
+	int	    mask;
 	u32	    fpc;
 	union {
 		freg_t fprs[__NUM_FPRS];

arch/s390/include/asm/fpu.h

@@ -89,8 +89,8 @@ enum {
  *
  * Prefer using the kernel_fpu_begin()/kernel_fpu_end() pair of functions.
  */
-void __kernel_fpu_begin(struct kernel_fpu *state, u32 flags);
-void __kernel_fpu_end(struct kernel_fpu *state, u32 flags);
+void __kernel_fpu_begin(struct kernel_fpu *state, int flags);
+void __kernel_fpu_end(struct kernel_fpu *state, int flags);
 
 static __always_inline void save_vx_regs(__vector128 *vxrs)
 {
@@ -144,7 +144,7 @@ static __always_inline void load_fp_regs(freg_t *fprs)
 	fpu_ld(15, &fprs[15]);
 }
 
-static inline void kernel_fpu_begin(struct kernel_fpu *state, u32 flags)
+static inline void kernel_fpu_begin(struct kernel_fpu *state, int flags)
 {
 	preempt_disable();
 	state->mask = S390_lowcore.fpu_flags;
@@ -158,7 +158,7 @@ static inline void kernel_fpu_begin(struct kernel_fpu *state, u32 flags)
 	S390_lowcore.fpu_flags |= flags;
 }
 
-static inline void kernel_fpu_end(struct kernel_fpu *state, u32 flags)
+static inline void kernel_fpu_end(struct kernel_fpu *state, int flags)
 {
 	S390_lowcore.fpu_flags = state->mask;
 	if (state->mask & flags) {

arch/s390/kernel/fpu.c

@@ -10,10 +10,10 @@
 #include <linux/sched.h>
 #include <asm/fpu.h>
 
-void __kernel_fpu_begin(struct kernel_fpu *state, u32 flags)
+void __kernel_fpu_begin(struct kernel_fpu *state, int flags)
 {
 	__vector128 *vxrs = state->vxrs;
-	u32 mask;
+	int mask;
 
 	/*
 	 * Limit the save to the FPU/vector registers already
@@ -58,10 +58,10 @@ void __kernel_fpu_begin(struct kernel_fpu *state, u32 flags)
 }
 EXPORT_SYMBOL(__kernel_fpu_begin);
 
-void __kernel_fpu_end(struct kernel_fpu *state, u32 flags)
+void __kernel_fpu_end(struct kernel_fpu *state, int flags)
 {
 	__vector128 *vxrs = state->vxrs;
-	u32 mask;
+	int mask;
 
 	/*
 	 * Limit the restore to the FPU/vector registers of the