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Commit 1b17cb79 authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

s390/fpu: signals vs. floating point control register 



git commit 904818e2
"s390/kernel: introduce fpu-internal.h with fpu helper functions"
introduced the fpregs_store / fp_regs_load helper. These function
fail to save and restore the floating pointer control registers.

The effect is that the FPC is not correctly handled on signal
delivery and signal return.

Cc: stable@vger.kernel.org # 4.4
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 342300cc

arch/s390/include/asm/fpu/internal.h

+2 −0
Original line number Diff line number Diff line
@@ -40,6 +40,7 @@ static inline void convert_fp_to_vx(__vector128 *vxrs, freg_t *fprs) 
static inline void fpregs_store(_s390_fp_regs *fpregs, struct fpu *fpu)

{

	fpregs->pad = 0;

	fpregs->fpc = fpu->fpc;

	if (MACHINE_HAS_VX)

		convert_vx_to_fp((freg_t *)&fpregs->fprs, fpu->vxrs);

	else
@@ -49,6 +50,7 @@ static inline void fpregs_store(_s390_fp_regs *fpregs, struct fpu *fpu) 


static inline void fpregs_load(_s390_fp_regs *fpregs, struct fpu *fpu)

{

	fpu->fpc = fpregs->fpc;

	if (MACHINE_HAS_VX)

		convert_fp_to_vx(fpu->vxrs, (freg_t *)&fpregs->fprs);

	else