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[MIPS] Disallow CpU exception in kernel again.

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The commit 4d40bff7110e9e1a97ff8c01bdd6350e9867cc10 ("Allow CpU
exception in kernel partially") was broken.  The commit was to fix
theoretical problem but broke usual case.  Revert it for now.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Atsushi Nemoto 2007-04-14 02:37:26 +09:00 • committed by Ralf Baechle
parent 9a9943575a
commit 5323180db7
7 changed files with 21 additions and 57 deletions
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16
include/asm-mips/fpu.h
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@ -68,8 +68,6 @@ do { \
/* We don't care about the c0 hazard here */ \
} while (0)
#define __fpu_enabled() (read_c0_status() & ST0_CU1)
#define enable_fpu() \
do { \
if (cpu_has_fpu) \
@ -162,18 +160,4 @@ static inline fpureg_t *get_fpu_regs(struct task_struct *tsk)
return tsk->thread.fpu.fpr;
}
static inline void enable_fp_in_kernel(void)
{
set_thread_flag(TIF_ALLOW_FP_IN_KERNEL);
/* make sure CU1 and FPU ownership are consistent */
if (!__is_fpu_owner() && __fpu_enabled())
__disable_fpu();
}
static inline void disable_fp_in_kernel(void)
{
BUG_ON(!__is_fpu_owner() && __fpu_enabled());
clear_thread_flag(TIF_ALLOW_FP_IN_KERNEL);
}
#endif /* _ASM_FPU_H */