diff options
| author | Hendrik Brueckner <brueckner@linux.vnet.ibm.com> | 2015-06-11 16:57:20 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-07-22 09:58:00 +0200 |
| commit | 155e839a814834a3b4b31e729f4716e59d3d2dd4 (patch) | |
| tree | e23d3bd009812c8a46caa418d42bf2a18ec6d39c /arch/s390/include/asm | |
| parent | 904818e2f229f3d94ec95f6932a6358c81e73d78 (diff) | |
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>
Diffstat (limited to 'arch/s390/include/asm')
| -rw-r--r-- | arch/s390/include/asm/fpu-internal.h | 19 |
1 files changed, 14 insertions, 5 deletions
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 */ |