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s390/fpu: remove regs member from struct fpu

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KVM was the only user which modified the regs pointer in struct fpu. Remove
the pointer and convert the rest of the core fpu code to directly access
the save area embedded within struct fpu.

Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2024-02-03 11:45:14 +01:00
parent ed3a0a011a
commit 9cbff7f221
4 changed files with 4 additions and 10 deletions
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1
arch/s390/include/asm/fpu-types.h
View File

@ -13,7 +13,6 @@
struct fpu {
__u32 fpc; /* Floating-point control */
void *regs; /* Pointer to the current save area */
union {
/* Floating-point register save area */
freg_t fprs[__NUM_FPRS];

1
arch/s390/include/asm/processor.h
View File

@ -202,7 +202,6 @@ typedef struct thread_struct thread_struct;
#define INIT_THREAD { \
.ksp = sizeof(init_stack) + (unsigned long) &init_stack, \
.ufpu.regs = (void *)init_task.thread.ufpu.fprs, \
.last_break = 1, \
}

11
arch/s390/kernel/fpu.c
View File

@ -110,13 +110,12 @@ EXPORT_SYMBOL(__kernel_fpu_end);
void __load_user_fpu_regs(void)
{
struct fpu *state = &current->thread.ufpu;
void *regs = current->thread.ufpu.regs;
fpu_lfpc_safe(&state->fpc);
if (likely(cpu_has_vx()))
load_vx_regs(regs);
load_vx_regs(state->vxrs);
else
load_fp_regs(regs);
load_fp_regs(state->fprs);
clear_thread_flag(TIF_FPU);
}
@ -132,7 +131,6 @@ void save_user_fpu_regs(void)
{
unsigned long flags;
struct fpu *state;
void *regs;
local_irq_save(flags);
@ -140,13 +138,12 @@ void save_user_fpu_regs(void)
goto out;
state = &current->thread.ufpu;
regs = current->thread.ufpu.regs;
fpu_stfpc(&state->fpc);
if (likely(cpu_has_vx()))
save_vx_regs(regs);
save_vx_regs(state->vxrs);
else
save_fp_regs(regs);
save_fp_regs(state->fprs);
set_thread_flag(TIF_FPU);
out:
local_irq_restore(flags);

1
arch/s390/kernel/process.c
View File

@ -94,7 +94,6 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
save_user_fpu_regs();
*dst = *src;
dst->thread.ufpu.regs = dst->thread.ufpu.fprs;
dst->thread.kfpu_flags = 0;
/*