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Code Issues Releases Wiki Activity

x86/fpu: Factor out fpu__copy()

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Introduce fpu__copy() and use it in arch_dup_task_struct(),
thus moving another chunk of FPU logic to fpu/core.c.

Reviewed-by: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2015-04-22 15:47:05 +02:00
parent 8ffb53ab98
commit a752b53d9d
3 changed files with 20 additions and 11 deletions
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1
arch/x86/include/asm/fpu-internal.h
View file

@ -567,6 +567,7 @@ static inline unsigned short get_fpu_mxcsr(struct task_struct *tsk)
extern void fpstate_cache_init(void);
extern int fpstate_alloc(struct fpu *fpu);
extern int fpu__copy(struct task_struct *dst, struct task_struct *src);
static inline void fpstate_free(struct fpu *fpu)
{

18
arch/x86/kernel/fpu/core.c
View file

@ -178,6 +178,24 @@ int fpstate_alloc(struct fpu *fpu)
}
EXPORT_SYMBOL_GPL(fpstate_alloc);
int fpu__copy(struct task_struct *dst, struct task_struct *src)
{
dst->thread.fpu.counter = 0;
dst->thread.fpu.has_fpu = 0;
dst->thread.fpu.state = NULL;
task_disable_lazy_fpu_restore(dst);
if (tsk_used_math(src)) {
int err = fpstate_alloc(&dst->thread.fpu);
if (err)
return err;
fpu_copy(dst, src);
}
return 0;
}
/*
* Allocate the backing store for the current task's FPU registers
* and initialize the registers themselves as well.

12
arch/x86/kernel/process.c
View file

@ -83,17 +83,7 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
{
*dst = *src;
dst->thread.fpu.counter = 0;
dst->thread.fpu.has_fpu = 0;
dst->thread.fpu.state = NULL;
task_disable_lazy_fpu_restore(dst);
if (tsk_used_math(src)) {
int err = fpstate_alloc(&dst->thread.fpu);
if (err)
return err;
fpu_copy(dst, src);
}
return 0;
return fpu__copy(dst, src);
}
void arch_release_task_struct(struct task_struct *tsk)