From: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Date: Thu, 11 Jun 2015 14:57:20 +0000 (+0200)
Subject: s390/kernel: dynamically allocate FP register save area
X-Git-Tag: omap-for-v4.3/fixes-merge-window~38^2~54
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=155e839a814834a3b4b31e729f4716e59d3d2dd4;p=pandora-kernel.git

s390/kernel: dynamically allocate FP register save area

Make the floating-point save area dynamically allocated and uses a flag
to distinguish whether a task uses floating-point or vector registers.

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 04b4cfc08fb5..cc44c75fc4f7 100644
--- a/arch/s390/include/asm/fpu-internal.h
+++ b/arch/s390/include/asm/fpu-internal.h
@@ -8,6 +8,10 @@
 #ifndef _ASM_S390_FPU_INTERNAL_H
 #define _ASM_S390_FPU_INTERNAL_H
 
+#define FPU_USE_VX		1	/* Vector extension is active */
+
+#ifndef __ASSEMBLY__
+
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <asm/linkage.h>
@@ -16,13 +20,16 @@
 
 struct fpu {
 	__u32 fpc;			/* Floating-point control */
-	__u32 pad;
-	freg_t fprs[__NUM_FPRS];	/* Floating-point register save area */
-	__vector128 *vxrs;		/* Vector register save area */
+	__u32 flags;
+	union {
+		void *regs;
+		freg_t *fprs;		/* Floating-point register save area */
+		__vector128 *vxrs;	/* Vector register save area */
+	};
 };
 
-#define is_vx_fpu(fpu) (!!(fpu)->vxrs)
-#define is_vx_task(tsk) (!!(tsk)->thread.fpu.vxrs)
+#define is_vx_fpu(fpu) (!!((fpu)->flags & FPU_USE_VX))
+#define is_vx_task(tsk) (!!((tsk)->thread.fpu.flags & FPU_USE_VX))
 
 static inline int test_fp_ctl(u32 fpc)
 {
@@ -188,4 +195,6 @@ static inline void restore_fpu_regs(struct fpu *fpu)
 		restore_fp_regs(fpu->fprs);
 }
 
+#endif
+
 #endif /* _ASM_S390_FPU_INTERNAL_H */
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