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authorHendrik Brueckner <brueckner@linux.vnet.ibm.com>2015-06-11 16:57:20 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2015-07-22 09:58:00 +0200
commit155e839a814834a3b4b31e729f4716e59d3d2dd4 (patch)
treee23d3bd009812c8a46caa418d42bf2a18ec6d39c /arch/s390/kernel/traps.c
parent904818e2f229f3d94ec95f6932a6358c81e73d78 (diff)
downloadlinux-155e839a814834a3b4b31e729f4716e59d3d2dd4.tar.bz2
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/kernel/traps.c')
-rw-r--r--arch/s390/kernel/traps.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index 97598d1876c7..7b09224c05a3 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -227,6 +227,7 @@ DO_ERROR_INFO(specification_exception, SIGILL, ILL_ILLOPN,
int alloc_vector_registers(struct task_struct *tsk)
{
__vector128 *vxrs;
+ freg_t *fprs;
/* Allocate vector register save area. */
vxrs = kzalloc(sizeof(__vector128) * __NUM_VXRS,
@@ -238,7 +239,10 @@ int alloc_vector_registers(struct task_struct *tsk)
save_fp_regs(tsk->thread.fpu.fprs);
/* Copy the 16 floating point registers */
convert_fp_to_vx(vxrs, tsk->thread.fpu.fprs);
+ fprs = tsk->thread.fpu.fprs;
tsk->thread.fpu.vxrs = vxrs;
+ tsk->thread.fpu.flags |= FPU_USE_VX;
+ kfree(fprs);
if (tsk == current) {
__ctl_set_bit(0, 17);
restore_vx_regs(vxrs);