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s390/fpu: remove ARCH_WANTS_DYNAMIC_TASK_STRUCT support

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s390 selects ARCH_WANTS_DYNAMIC_TASK_STRUCT in order to make the size of
the task structure dependent on the availability of the vector
facility. This doesn't make sense anymore because since many years all
machines provide the vector facility.

Therefore simplify the code a bit and remove s390 support for
ARCH_WANTS_DYNAMIC_TASK_STRUCT.

Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2023-12-01 15:42:16 +01:00 committed by Alexander Gordeev
parent d7271ba401
commit d7f679ec86
4 changed files with 2 additions and 24 deletions
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1
arch/s390/Kconfig
View file

@ -123,7 +123,6 @@ config S390
select ARCH_USE_BUILTIN_BSWAP
select ARCH_USE_CMPXCHG_LOCKREF
select ARCH_USE_SYM_ANNOTATIONS
select ARCH_WANTS_DYNAMIC_TASK_STRUCT
select ARCH_WANTS_NO_INSTR
select ARCH_WANT_DEFAULT_BPF_JIT
select ARCH_WANT_IPC_PARSE_VERSION

6
arch/s390/include/asm/processor.h
View file

@ -184,11 +184,7 @@ struct thread_struct {
struct gs_cb *gs_cb; /* Current guarded storage cb */
struct gs_cb *gs_bc_cb; /* Broadcast guarded storage cb */
struct pgm_tdb trap_tdb; /* Transaction abort diagnose block */
/*
* Warning: 'fpu' is dynamically-sized. It *MUST* be at
* the end.
*/
struct fpu fpu; /* FP and VX register save area */
struct fpu fpu; /* FP and VX register save area */
};
/* Flag to disable transactions. */

2
arch/s390/kernel/process.c
View file

@ -89,7 +89,7 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
*/
save_fpu_regs();
memcpy(dst, src, arch_task_struct_size);
*dst = *src;
dst->thread.fpu.regs = dst->thread.fpu.fprs;
/*

17
arch/s390/kernel/setup.c
View file

@ -819,22 +819,6 @@ static void __init setup_randomness(void)
static_branch_enable(&s390_arch_random_available);
}
/*
* Find the correct size for the task_struct. This depends on
* the size of the struct fpu at the end of the thread_struct
* which is embedded in the task_struct.
*/
static void __init setup_task_size(void)
{
int task_size = sizeof(struct task_struct);
if (!MACHINE_HAS_VX) {
task_size -= sizeof(__vector128) * __NUM_VXRS;
task_size += sizeof(freg_t) * __NUM_FPRS;
}
arch_task_struct_size = task_size;
}
/*
* Issue diagnose 318 to set the control program name and
* version codes.
@ -927,7 +911,6 @@ void __init setup_arch(char **cmdline_p)
os_info_init();
setup_ipl();
setup_task_size();
setup_control_program_code();
/* Do some memory reservations *before* memory is added to memblock */