diff options
Diffstat (limited to 'arch/x86/include/asm/fpu/api.h')
| -rw-r--r-- | arch/x86/include/asm/fpu/api.h | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/arch/x86/include/asm/fpu/api.h b/arch/x86/include/asm/fpu/api.h index 73e684160f35..b774c52e5411 100644 --- a/arch/x86/include/asm/fpu/api.h +++ b/arch/x86/include/asm/fpu/api.h @@ -10,7 +10,7 @@ #ifndef _ASM_X86_FPU_API_H #define _ASM_X86_FPU_API_H -#include <linux/preempt.h> +#include <linux/bottom_half.h> /* * Use kernel_fpu_begin/end() if you intend to use FPU in kernel context. It @@ -22,17 +22,37 @@ extern void kernel_fpu_begin(void); extern void kernel_fpu_end(void); extern bool irq_fpu_usable(void); +extern void fpregs_mark_activate(void); +/* + * Use fpregs_lock() while editing CPU's FPU registers or fpu->state. + * A context switch will (and softirq might) save CPU's FPU registers to + * fpu->state and set TIF_NEED_FPU_LOAD leaving CPU's FPU registers in + * a random state. + */ static inline void fpregs_lock(void) { preempt_disable(); + local_bh_disable(); } static inline void fpregs_unlock(void) { + local_bh_enable(); preempt_enable(); } +#ifdef CONFIG_X86_DEBUG_FPU +extern void fpregs_assert_state_consistent(void); +#else +static inline void fpregs_assert_state_consistent(void) { } +#endif + +/* + * Load the task FPU state before returning to userspace. + */ +extern void switch_fpu_return(void); + /* * Query the presence of one or more xfeatures. Works on any legacy CPU as well. * |