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s390/kernel: remove save_fpu_regs() parameter and use __LC_CURRENT instead

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All calls to save_fpu_regs() specify the fpu structure of the current task
pointer as parameter.  The task pointer of the current task can also be
retrieved from the CPU lowcore directly.  Remove the parameter definition,
load the __LC_CURRENT task pointer from the CPU lowcore, and rebase the FPU
structure onto the task structure.  Apply the same approach for the
load_fpu_regs() function.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Hendrik Brueckner
2015-06-29 16:43:06 +02:00
committed by Martin Schwidefsky
parent 2a01bd1bd3
commit d0164ee20d
10 changed files with 45 additions and 47 deletions
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6
arch/s390/kernel/traps.c
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@@ -236,7 +236,7 @@ int alloc_vector_registers(struct task_struct *tsk)
return -ENOMEM;
preempt_disable();
if (tsk == current)
save_fpu_regs(&tsk->thread.fpu);
save_fpu_regs();
/* Copy the 16 floating point registers */
convert_fp_to_vx(vxrs, tsk->thread.fpu.fprs);
fprs = tsk->thread.fpu.fprs;
@@ -257,7 +257,7 @@ void vector_exception(struct pt_regs *regs)
}
/* get vector interrupt code from fpc */
save_fpu_regs(&current->thread.fpu);
save_fpu_regs();
vic = (current->thread.fpu.fpc & 0xf00) >> 8;
switch (vic) {
case 1: /* invalid vector operation */
@@ -295,7 +295,7 @@ void data_exception(struct pt_regs *regs)
location = get_trap_ip(regs);
save_fpu_regs(&current->thread.fpu);
save_fpu_regs();
/* Check for vector register enablement */
if (MACHINE_HAS_VX && !is_vx_task(current) &&
(current->thread.fpu.fpc & FPC_DXC_MASK) == 0xfe00) {