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i387: math_state_restore() isn't called from asm

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It was marked asmlinkage for some really old and stale legacy reasons.
Fix that and the equally stale comment.

Noticed when debugging the irq_fpu_usable() bugs.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2012-02-13 13:47:25 -08:00
parent 3ec1e88b33
commit be98c2cdb1
2 changed files with 4 additions and 4 deletions
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2
arch/x86/include/asm/i387.h
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@ -29,7 +29,7 @@ extern unsigned int sig_xstate_size;
extern void fpu_init(void); extern void fpu_init(void);
extern void mxcsr_feature_mask_init(void); extern void mxcsr_feature_mask_init(void);
extern int init_fpu(struct task_struct *child); extern int init_fpu(struct task_struct *child);
extern asmlinkage void math_state_restore(void); extern void math_state_restore(void);
extern void __math_state_restore(void); extern void __math_state_restore(void);
extern int dump_fpu(struct pt_regs *, struct user_i387_struct *); extern int dump_fpu(struct pt_regs *, struct user_i387_struct *);

6
arch/x86/kernel/traps.c
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@ -599,10 +599,10 @@ void __math_state_restore(void)
* Careful.. There are problems with IBM-designed IRQ13 behaviour. * Careful.. There are problems with IBM-designed IRQ13 behaviour.
* Don't touch unless you *really* know how it works. * Don't touch unless you *really* know how it works.
* *
* Must be called with kernel preemption disabled (in this case, * Must be called with kernel preemption disabled (eg with local
* local interrupts are disabled at the call-site in entry.S). * local interrupts as in the case of do_device_not_available).
*/ */
asmlinkage void math_state_restore(void) void math_state_restore(void)
{ {
struct thread_info *thread = current_thread_info(); struct thread_info *thread = current_thread_info();
struct task_struct *tsk = thread->task; struct task_struct *tsk = thread->task;