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x86/fpu: Move fpu_alloc() out of line 

This is not a small function, and it's used in several places,
one of them a popular module (KVM).

Move the function out of line. This saves a bit of text,
even with the symbol export overhead:

   text    data     bss     dec     hex filename
   12566052        1619504 1089536 15275092         e91454 vmlinux.before
   12566046        1619504 1089536 15275086         e9144e vmlinux.after

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 12:37:30 +02:00
parent 373244221a
commit 6fbe671248
2 changed files with 13 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
arch/x86/include/asm/fpu-internal.h
View File

@ -569,16 +569,7 @@ static inline unsigned short get_fpu_mxcsr(struct task_struct *tsk)
}
}
static inline int fpu_alloc(struct fpu *fpu)
{
if (fpu->state)
return 0;
fpu->state = kmem_cache_alloc(task_xstate_cachep, GFP_KERNEL);
if (!fpu->state)
return -ENOMEM;
WARN_ON((unsigned long)fpu->state & 15);
return 0;
}
extern int fpu_alloc(struct fpu *fpu);
static inline void fpu_free(struct fpu *fpu)
{

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

@ -246,6 +246,18 @@ void fpu_finit(struct fpu *fpu)
}
EXPORT_SYMBOL_GPL(fpu_finit);
int fpu_alloc(struct fpu *fpu)
{
if (fpu->state)
return 0;
fpu->state = kmem_cache_alloc(task_xstate_cachep, GFP_KERNEL);
if (!fpu->state)
return -ENOMEM;
WARN_ON((unsigned long)fpu->state & 15);
return 0;
}
EXPORT_SYMBOL_GPL(fpu_alloc);
/*
* Allocate the backing store for the current task's FPU registers
* and initialize the registers themselves as well.