616c05d110
Only a couple of arches (sh/x86) use fpu_counter in task_struct so it can be moved out into ARCH specific thread_struct, reducing the size of task_struct for other arches. Compile tested sh defconfig + sh4-linux-gcc (4.6.3) Signed-off-by: Vineet Gupta <vgupta@synopsys.com> Cc: Paul Mundt <paul.mundt@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
#ifndef __ASM_SH_FPU_H
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#define __ASM_SH_FPU_H
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#ifndef __ASSEMBLY__
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struct task_struct;
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#ifdef CONFIG_SH_FPU
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static inline void release_fpu(struct pt_regs *regs)
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{
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regs->sr |= SR_FD;
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}
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static inline void grab_fpu(struct pt_regs *regs)
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{
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regs->sr &= ~SR_FD;
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}
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extern void save_fpu(struct task_struct *__tsk);
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extern void restore_fpu(struct task_struct *__tsk);
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extern void fpu_state_restore(struct pt_regs *regs);
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extern void __fpu_state_restore(void);
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#else
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#define save_fpu(tsk) do { } while (0)
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#define restore_fpu(tsk) do { } while (0)
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#define release_fpu(regs) do { } while (0)
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#define grab_fpu(regs) do { } while (0)
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#define fpu_state_restore(regs) do { } while (0)
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#define __fpu_state_restore(regs) do { } while (0)
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#endif
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struct user_regset;
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extern int do_fpu_inst(unsigned short, struct pt_regs *);
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extern int init_fpu(struct task_struct *);
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extern int fpregs_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf);
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static inline void __unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
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{
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if (task_thread_info(tsk)->status & TS_USEDFPU) {
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task_thread_info(tsk)->status &= ~TS_USEDFPU;
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save_fpu(tsk);
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release_fpu(regs);
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} else
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tsk->thread.fpu_counter = 0;
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}
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static inline void unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
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{
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preempt_disable();
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__unlazy_fpu(tsk, regs);
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preempt_enable();
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}
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static inline void clear_fpu(struct task_struct *tsk, struct pt_regs *regs)
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{
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preempt_disable();
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if (task_thread_info(tsk)->status & TS_USEDFPU) {
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task_thread_info(tsk)->status &= ~TS_USEDFPU;
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release_fpu(regs);
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}
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preempt_enable();
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}
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#endif /* __ASSEMBLY__ */
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#endif /* __ASM_SH_FPU_H */
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