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s390/fpu: add static FPU save area for init_task

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Previously, the init task did not have an allocated FPU save area and
saving an FPU state was not possible.  Now if the vector extension is
always enabled, provide a static FPU save area to save FPU states of
vector instructions that can be executed quite early.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Hendrik Brueckner 2015-09-29 17:53:22 +02:00 committed by Martin Schwidefsky
parent b5510d9b68
commit 0ac277790e
3 changed files with 6 additions and 4 deletions
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2
arch/s390/include/asm/processor.h
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@ -139,8 +139,10 @@ struct stack_frame {
#define ARCH_MIN_TASKALIGN 8
extern __vector128 init_task_fpu_regs[__NUM_VXRS];
#define INIT_THREAD { \
.ksp = sizeof(init_stack) + (unsigned long) &init_stack, \
.fpu.regs = (void *)&init_task_fpu_regs, \
}
/*

4
arch/s390/kernel/entry.S
View File

@ -762,8 +762,6 @@ ENTRY(save_fpu_regs)
stfpc __THREAD_FPU_fpc(%r2)
.Lsave_fpu_regs_fpc_end:
lg %r3,__THREAD_FPU_regs(%r2)
ltgr %r3,%r3
jz .Lsave_fpu_regs_done # no save area -> set CIF_FPU
tm __LC_MACHINE_FLAGS+5,4 # MACHINE_HAS_VX
jz .Lsave_fpu_regs_fp # no -> store FP regs
.Lsave_fpu_regs_vx_low:
@ -1193,8 +1191,6 @@ cleanup_critical:
stfpc __THREAD_FPU_fpc(%r2)
1: # Load register save area and check if VX is active
lg %r3,__THREAD_FPU_regs(%r2)
ltgr %r3,%r3
jz 5f # no save area -> set CIF_FPU
tm __LC_MACHINE_FLAGS+5,4 # MACHINE_HAS_VX
jz 4f # no VX -> store FP regs
2: # Store vector registers (V0-V15)

4
arch/s390/kernel/process.c
View File

@ -23,6 +23,7 @@
#include <linux/kprobes.h>
#include <linux/random.h>
#include <linux/module.h>
#include <linux/init_task.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/vtimer.h>
@ -36,6 +37,9 @@
asmlinkage void ret_from_fork(void) asm ("ret_from_fork");
/* FPU save area for the init task */
__vector128 init_task_fpu_regs[__NUM_VXRS] __init_task_data;
/*
* Return saved PC of a blocked thread. used in kernel/sched.
* resume in entry.S does not create a new stack frame, it