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x86/fpu: Rename fpu_alloc() to fpstate_alloc() 

Use the fpu__*() namespace for fpstate_alloc() as well.

Also add a comment about FPU state alignment.

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 2015-04-03 12:41:14 +02:00
parent 6fbe671248
commit ed97b08546
4 changed files with 11 additions and 7 deletions
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2
arch/x86/include/asm/fpu-internal.h
View File

@ -569,7 +569,7 @@ static inline unsigned short get_fpu_mxcsr(struct task_struct *tsk)
}
}
extern int fpu_alloc(struct fpu *fpu);
extern int fpstate_alloc(struct fpu *fpu);
static inline void fpu_free(struct fpu *fpu)
{

12
arch/x86/kernel/i387.c
View File

@ -246,17 +246,21 @@ void fpu_finit(struct fpu *fpu)
}
EXPORT_SYMBOL_GPL(fpu_finit);
int fpu_alloc(struct fpu *fpu)
int fpstate_alloc(struct fpu *fpu)
{
if (fpu->state)
return 0;
fpu->state = kmem_cache_alloc(task_xstate_cachep, GFP_KERNEL);
if (!fpu->state)
return -ENOMEM;
/* The CPU requires the FPU state to be aligned to 16 byte boundaries: */
WARN_ON((unsigned long)fpu->state & 15);
return 0;
}
EXPORT_SYMBOL_GPL(fpu_alloc);
EXPORT_SYMBOL_GPL(fpstate_alloc);
/*
* Allocate the backing store for the current task's FPU registers
@ -276,7 +280,7 @@ int fpstate_alloc_init(struct task_struct *curr)
/*
* Memory allocation at the first usage of the FPU and other state.
*/
ret = fpu_alloc(&curr->thread.fpu);
ret = fpstate_alloc(&curr->thread.fpu);
if (ret)
return ret;
@ -310,7 +314,7 @@ static int fpu__unlazy_stopped(struct task_struct *child)
/*
* Memory allocation at the first usage of the FPU and other state.
*/
ret = fpu_alloc(&child->thread.fpu);
ret = fpstate_alloc(&child->thread.fpu);
if (ret)
return ret;

2
arch/x86/kernel/process.c
View File

@ -92,7 +92,7 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
dst->thread.fpu.state = NULL;
task_disable_lazy_fpu_restore(dst);
if (tsk_used_math(src)) {
int err = fpu_alloc(&dst->thread.fpu);
int err = fpstate_alloc(&dst->thread.fpu);
if (err)
return err;
fpu_copy(dst, src);

2
arch/x86/kvm/x86.c
View File

@ -7007,7 +7007,7 @@ int fx_init(struct kvm_vcpu *vcpu)
{
int err;
err = fpu_alloc(&vcpu->arch.guest_fpu);
err = fpstate_alloc(&vcpu->arch.guest_fpu);
if (err)
return err;