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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-12 00:26:43 +07:00
138bed154e
The unlazy_fpu() path calls in to save_fpu() if the task has TIF_USEDFPU set. save_fpu() being the crap API that it is has the side effect of clearing the flag itself, which presently doesn't happen if we're using FPU emulation. Fix this up for now, pending an overhaul in 2.6.26. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
56 lines
1.1 KiB
C
56 lines
1.1 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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#include <linux/preempt.h>
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#include <asm/ptrace.h>
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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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struct task_struct;
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extern void save_fpu(struct task_struct *__tsk, struct pt_regs *regs);
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#else
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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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static inline void save_fpu(struct task_struct *tsk, struct pt_regs *regs)
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{
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clear_tsk_thread_flag(tsk, TIF_USEDFPU);
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}
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#endif
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extern int do_fpu_inst(unsigned short, struct pt_regs *);
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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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if (test_tsk_thread_flag(tsk, TIF_USEDFPU))
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save_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 (test_tsk_thread_flag(tsk, TIF_USEDFPU)) {
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clear_tsk_thread_flag(tsk, TIF_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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