include/asm-sparc64/thread_info.h - kernel/msm-4.19 - Gitiles

 /* thread_info.h: sparc64 low-level thread information
  *
  * Copyright (C) 2002  David S. Miller (davem@redhat.com)
  */

 #ifndef _ASM_THREAD_INFO_H
 #define _ASM_THREAD_INFO_H

 #ifdef __KERNEL__

 #define NSWINS		7

 #define TI_FLAG_BYTE_FAULT_CODE		0
 #define TI_FLAG_FAULT_CODE_SHIFT	56
 #define TI_FLAG_BYTE_WSTATE		1
 #define TI_FLAG_WSTATE_SHIFT		48
 #define TI_FLAG_BYTE_CWP		2
 #define TI_FLAG_CWP_SHIFT		40
 #define TI_FLAG_BYTE_CURRENT_DS		3
 #define TI_FLAG_CURRENT_DS_SHIFT	32
 #define TI_FLAG_BYTE_FPDEPTH		4
 #define TI_FLAG_FPDEPTH_SHIFT		24
 #define TI_FLAG_BYTE_WSAVED		5
 #define TI_FLAG_WSAVED_SHIFT		16

 #include <asm/page.h>

 #ifndef __ASSEMBLY__

 #include <asm/ptrace.h>
 #include <asm/types.h>

 struct task_struct;
 struct exec_domain;

 struct thread_info {
 	/* D$ line 1 */
 	struct task_struct	*task;
 	unsigned long		flags;
 	__u8			fpsaved[7];
 	__u8			status;
 	unsigned long		ksp;

 	/* D$ line 2 */
 	unsigned long		fault_address;
 	struct pt_regs		*kregs;
 	struct exec_domain	*exec_domain;
 	int			preempt_count;	/* 0 => preemptable, <0 => BUG */
 	__u8			new_child;
 	__u8			syscall_noerror;
 	__u16			cpu;

 	unsigned long		*utraps;

 	struct reg_window 	reg_window[NSWINS];
 	unsigned long 		rwbuf_stkptrs[NSWINS];

 	unsigned long		gsr[7];
 	unsigned long		xfsr[7];

 	__u64			__user *user_cntd0;
 	__u64			__user *user_cntd1;
 	__u64			kernel_cntd0, kernel_cntd1;
 	__u64			pcr_reg;

 	struct restart_block	restart_block;

 	struct pt_regs		*kern_una_regs;
 	unsigned int		kern_una_insn;

 	unsigned long		fpregs[0] __attribute__ ((aligned(64)));
 };

 #endif /* !(__ASSEMBLY__) */

 /* offsets into the thread_info struct for assembly code access */
 #define TI_TASK		0x00000000
 #define TI_FLAGS	0x00000008
 #define TI_FAULT_CODE	(TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
 #define TI_WSTATE	(TI_FLAGS + TI_FLAG_BYTE_WSTATE)
 #define TI_CWP		(TI_FLAGS + TI_FLAG_BYTE_CWP)
 #define TI_CURRENT_DS	(TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS)
 #define TI_FPDEPTH	(TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
 #define TI_WSAVED	(TI_FLAGS + TI_FLAG_BYTE_WSAVED)
 #define TI_FPSAVED	0x00000010
 #define TI_KSP		0x00000018
 #define TI_FAULT_ADDR	0x00000020
 #define TI_KREGS	0x00000028
 #define TI_EXEC_DOMAIN	0x00000030
 #define TI_PRE_COUNT	0x00000038
 #define TI_NEW_CHILD	0x0000003c
 #define TI_SYS_NOERROR	0x0000003d
 #define TI_CPU		0x0000003e
 #define TI_UTRAPS	0x00000040
 #define TI_REG_WINDOW	0x00000048
 #define TI_RWIN_SPTRS	0x000003c8
 #define TI_GSR		0x00000400
 #define TI_XFSR		0x00000438
 #define TI_USER_CNTD0	0x00000470
 #define TI_USER_CNTD1	0x00000478
 #define TI_KERN_CNTD0	0x00000480
 #define TI_KERN_CNTD1	0x00000488
 #define TI_PCR		0x00000490
 #define TI_RESTART_BLOCK 0x00000498
 #define TI_KUNA_REGS	0x000004c0
 #define TI_KUNA_INSN	0x000004c8
 #define TI_FPREGS	0x00000500

 /* We embed this in the uppermost byte of thread_info->flags */
 #define FAULT_CODE_WRITE	0x01	/* Write access, implies D-TLB	   */
 #define FAULT_CODE_DTLB		0x02	/* Miss happened in D-TLB	   */
 #define FAULT_CODE_ITLB		0x04	/* Miss happened in I-TLB	   */
 #define FAULT_CODE_WINFIXUP	0x08	/* Miss happened during spill/fill */
 #define FAULT_CODE_BLKCOMMIT	0x10	/* Use blk-commit ASI in copy_page */

 #if PAGE_SHIFT == 13
 #define THREAD_SIZE (2*PAGE_SIZE)
 #define THREAD_SHIFT (PAGE_SHIFT + 1)
 #else /* PAGE_SHIFT == 13 */
 #define THREAD_SIZE PAGE_SIZE
 #define THREAD_SHIFT PAGE_SHIFT
 #endif /* PAGE_SHIFT == 13 */

 #define PREEMPT_ACTIVE		0x4000000

 /*
  * macros/functions for gaining access to the thread information structure
  *
  * preempt_count needs to be 1 initially, until the scheduler is functional.
  */
 #ifndef __ASSEMBLY__

 #define INIT_THREAD_INFO(tsk)				\
 {							\
 	.task		=	&tsk,			\
 	.flags		= ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT,	\
 	.exec_domain	=	&default_exec_domain,	\
 	.preempt_count	=	1,			\
 	.restart_block	= {				\
 		.fn	=	do_no_restart_syscall,	\
 	},						\
 }

 #define init_thread_info	(init_thread_union.thread_info)
 #define init_stack		(init_thread_union.stack)

 /* how to get the thread information struct from C */
 register struct thread_info *current_thread_info_reg asm("g6");
 #define current_thread_info()	(current_thread_info_reg)

 /* thread information allocation */
 #if PAGE_SHIFT == 13
 #define __THREAD_INFO_ORDER	1
 #else /* PAGE_SHIFT == 13 */
 #define __THREAD_INFO_ORDER	0
 #endif /* PAGE_SHIFT == 13 */

 #ifdef CONFIG_DEBUG_STACK_USAGE
 #define alloc_thread_info(tsk)					\
 ({								\
 	struct thread_info *ret;				\
 								\
 	ret = (struct thread_info *)				\
 	  __get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER);	\
 	if (ret)						\
 		memset(ret, 0, PAGE_SIZE<<__THREAD_INFO_ORDER);	\
 	ret;							\
 })
 #else
 #define alloc_thread_info(tsk) \
 	((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER))
 #endif

 #define free_thread_info(ti) \
 	free_pages((unsigned long)(ti),__THREAD_INFO_ORDER)

 #define __thread_flag_byte_ptr(ti)	\
 	((unsigned char *)(&((ti)->flags)))
 #define __cur_thread_flag_byte_ptr	__thread_flag_byte_ptr(current_thread_info())

 #define get_thread_fault_code()		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
 #define set_thread_fault_code(val)	(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
 #define get_thread_wstate()		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
 #define set_thread_wstate(val)		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
 #define get_thread_cwp()		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
 #define set_thread_cwp(val)		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
 #define get_thread_current_ds()		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
 #define set_thread_current_ds(val)	(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
 #define get_thread_fpdepth()		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
 #define set_thread_fpdepth(val)		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
 #define get_thread_wsaved()		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
 #define set_thread_wsaved(val)		(__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))

 #endif /* !(__ASSEMBLY__) */

 /*
  * Thread information flags, only 16 bits are available as we encode
  * other values into the upper 6 bytes.
  *
  * On trap return we need to test several values:
  *
  * user:	need_resched, notify_resume, sigpending, wsaved, perfctr
  * kernel:	fpdepth
  *
  * So to check for work in the kernel case we simply load the fpdepth
  * byte out of the flags and test it.  For the user case we encode the
  * lower 3 bytes of flags as follows:
  *	----------------------------------------
  *	| wsaved | flags byte 1 | flags byte 2 |
  *	----------------------------------------
  * This optimizes the user test into:
  *	ldx		[%g6 + TI_FLAGS], REG1
  *	sethi		%hi(_TIF_USER_WORK_MASK), REG2
  *	or		REG2, %lo(_TIF_USER_WORK_MASK), REG2
  *	andcc		REG1, REG2, %g0
  *	be,pt		no_work_to_do
  *	 nop
  */
 #define TIF_SYSCALL_TRACE	0	/* syscall trace active */
 /* flags bit 1 is available */
 #define TIF_SIGPENDING		2	/* signal pending */
 #define TIF_NEED_RESCHED	3	/* rescheduling necessary */
 #define TIF_PERFCTR		4	/* performance counters active */
 #define TIF_UNALIGNED		5	/* allowed to do unaligned accesses */
 /* flag bit 6 is available */
 #define TIF_32BIT		7	/* 32-bit binary */
 /* flag bit 8 is available */
 #define TIF_SECCOMP		9	/* secure computing */
 #define TIF_SYSCALL_AUDIT	10	/* syscall auditing active */
 /* flag bit 11 is available */
 /* NOTE: Thread flags >= 12 should be ones we have no interest
  *       in using in assembly, else we can't use the mask as
  *       an immediate value in instructions such as andcc.
  */
 #define TIF_ABI_PENDING		12
 #define TIF_MEMDIE		13
 #define TIF_POLLING_NRFLAG	14

 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
 #define _TIF_PERFCTR		(1<<TIF_PERFCTR)
 #define _TIF_UNALIGNED		(1<<TIF_UNALIGNED)
 #define _TIF_32BIT		(1<<TIF_32BIT)
 #define _TIF_SECCOMP		(1<<TIF_SECCOMP)
 #define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
 #define _TIF_ABI_PENDING	(1<<TIF_ABI_PENDING)
 #define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)

 #define _TIF_USER_WORK_MASK	((0xff << TI_FLAG_WSAVED_SHIFT) | \
 				 (_TIF_SIGPENDING | \
 				  _TIF_NEED_RESCHED | _TIF_PERFCTR))

 /*
  * Thread-synchronous status.
  *
  * This is different from the flags in that nobody else
  * ever touches our thread-synchronous status, so we don't
  * have to worry about atomic accesses.
  *
  * Note that there are only 8 bits available.
  */
 #define TS_RESTORE_SIGMASK	0x0001	/* restore signal mask in do_signal() */

 #ifndef __ASSEMBLY__
 #define HAVE_SET_RESTORE_SIGMASK	1
 static inline void set_restore_sigmask(void)
 {
 	struct thread_info *ti = current_thread_info();
 	ti->status |= TS_RESTORE_SIGMASK;
 	set_bit(TIF_SIGPENDING, &ti->flags);
 }
 #endif	/* !__ASSEMBLY__ */

 #endif /* __KERNEL__ */

 #endif /* _ASM_THREAD_INFO_H */
	/* thread_info.h: sparc64 low-level thread information
	*
	* Copyright (C) 2002 David S. Miller (davem@redhat.com)
	*/

	#ifndef _ASM_THREAD_INFO_H
	#define _ASM_THREAD_INFO_H

	#ifdef __KERNEL__

	#define NSWINS 7

	#define TI_FLAG_BYTE_FAULT_CODE 0
	#define TI_FLAG_FAULT_CODE_SHIFT 56
	#define TI_FLAG_BYTE_WSTATE 1
	#define TI_FLAG_WSTATE_SHIFT 48
	#define TI_FLAG_BYTE_CWP 2
	#define TI_FLAG_CWP_SHIFT 40
	#define TI_FLAG_BYTE_CURRENT_DS 3
	#define TI_FLAG_CURRENT_DS_SHIFT 32
	#define TI_FLAG_BYTE_FPDEPTH 4
	#define TI_FLAG_FPDEPTH_SHIFT 24
	#define TI_FLAG_BYTE_WSAVED 5
	#define TI_FLAG_WSAVED_SHIFT 16

	#include <asm/page.h>

	#ifndef __ASSEMBLY__

	#include <asm/ptrace.h>
	#include <asm/types.h>

	struct task_struct;
	struct exec_domain;

	struct thread_info {
	/* D$ line 1 */
	struct task_struct *task;
	unsigned long flags;
	__u8 fpsaved[7];
	__u8 status;
	unsigned long ksp;

	/* D$ line 2 */
	unsigned long fault_address;
	struct pt_regs *kregs;
	struct exec_domain *exec_domain;
	int preempt_count; /* 0 => preemptable, <0 => BUG */
	__u8 new_child;
	__u8 syscall_noerror;
	__u16 cpu;

	unsigned long *utraps;

	struct reg_window reg_window[NSWINS];
	unsigned long rwbuf_stkptrs[NSWINS];

	unsigned long gsr[7];
	unsigned long xfsr[7];

	__u64 __user *user_cntd0;
	__u64 __user *user_cntd1;
	__u64 kernel_cntd0, kernel_cntd1;
	__u64 pcr_reg;

	struct restart_block restart_block;

	struct pt_regs *kern_una_regs;
	unsigned int kern_una_insn;

	unsigned long fpregs[0] __attribute__ ((aligned(64)));
	};

	#endif /* !(__ASSEMBLY__) */

	/* offsets into the thread_info struct for assembly code access */
	#define TI_TASK 0x00000000
	#define TI_FLAGS 0x00000008
	#define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
	#define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
	#define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP)
	#define TI_CURRENT_DS (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS)
	#define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
	#define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
	#define TI_FPSAVED 0x00000010
	#define TI_KSP 0x00000018
	#define TI_FAULT_ADDR 0x00000020
	#define TI_KREGS 0x00000028
	#define TI_EXEC_DOMAIN 0x00000030
	#define TI_PRE_COUNT 0x00000038
	#define TI_NEW_CHILD 0x0000003c
	#define TI_SYS_NOERROR 0x0000003d
	#define TI_CPU 0x0000003e
	#define TI_UTRAPS 0x00000040
	#define TI_REG_WINDOW 0x00000048
	#define TI_RWIN_SPTRS 0x000003c8
	#define TI_GSR 0x00000400
	#define TI_XFSR 0x00000438
	#define TI_USER_CNTD0 0x00000470
	#define TI_USER_CNTD1 0x00000478
	#define TI_KERN_CNTD0 0x00000480
	#define TI_KERN_CNTD1 0x00000488
	#define TI_PCR 0x00000490
	#define TI_RESTART_BLOCK 0x00000498
	#define TI_KUNA_REGS 0x000004c0
	#define TI_KUNA_INSN 0x000004c8
	#define TI_FPREGS 0x00000500

	/* We embed this in the uppermost byte of thread_info->flags */
	#define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */
	#define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */
	#define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */
	#define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */
	#define FAULT_CODE_BLKCOMMIT 0x10 /* Use blk-commit ASI in copy_page */

	#if PAGE_SHIFT == 13
	#define THREAD_SIZE (2*PAGE_SIZE)
	#define THREAD_SHIFT (PAGE_SHIFT + 1)
	#else /* PAGE_SHIFT == 13 */
	#define THREAD_SIZE PAGE_SIZE
	#define THREAD_SHIFT PAGE_SHIFT
	#endif /* PAGE_SHIFT == 13 */

	#define PREEMPT_ACTIVE 0x4000000

	/*
	* macros/functions for gaining access to the thread information structure
	*
	* preempt_count needs to be 1 initially, until the scheduler is functional.
	*/
	#ifndef __ASSEMBLY__

	#define INIT_THREAD_INFO(tsk) \
	{ \
	.task = &tsk, \
	.flags = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT, \
	.exec_domain = &default_exec_domain, \
	.preempt_count = 1, \
	.restart_block = { \
	.fn = do_no_restart_syscall, \
	}, \
	}

	#define init_thread_info (init_thread_union.thread_info)
	#define init_stack (init_thread_union.stack)

	/* how to get the thread information struct from C */
	register struct thread_info *current_thread_info_reg asm("g6");
	#define current_thread_info() (current_thread_info_reg)

	/* thread information allocation */
	#if PAGE_SHIFT == 13
	#define __THREAD_INFO_ORDER 1
	#else /* PAGE_SHIFT == 13 */
	#define __THREAD_INFO_ORDER 0
	#endif /* PAGE_SHIFT == 13 */

	#ifdef CONFIG_DEBUG_STACK_USAGE
	#define alloc_thread_info(tsk) \
	({ \
	struct thread_info *ret; \
	\
	ret = (struct thread_info *) \
	__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER); \
	if (ret) \
	memset(ret, 0, PAGE_SIZE<<__THREAD_INFO_ORDER); \
	ret; \
	})
	#else
	#define alloc_thread_info(tsk) \
	((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER))
	#endif

	#define free_thread_info(ti) \
	free_pages((unsigned long)(ti),__THREAD_INFO_ORDER)

	#define __thread_flag_byte_ptr(ti) \
	((unsigned char *)(&((ti)->flags)))
	#define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info())

	#define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
	#define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
	#define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
	#define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
	#define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
	#define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
	#define get_thread_current_ds() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
	#define set_thread_current_ds(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
	#define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
	#define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
	#define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
	#define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))

	#endif /* !(__ASSEMBLY__) */

	/*
	* Thread information flags, only 16 bits are available as we encode
	* other values into the upper 6 bytes.
	*
	* On trap return we need to test several values:
	*
	* user: need_resched, notify_resume, sigpending, wsaved, perfctr
	* kernel: fpdepth
	*
	* So to check for work in the kernel case we simply load the fpdepth
	* byte out of the flags and test it. For the user case we encode the
	* lower 3 bytes of flags as follows:
	* ----------------------------------------
	* \| wsaved \| flags byte 1 \| flags byte 2 \|
	* ----------------------------------------
	* This optimizes the user test into:
	* ldx [%g6 + TI_FLAGS], REG1
	* sethi %hi(_TIF_USER_WORK_MASK), REG2
	* or REG2, %lo(_TIF_USER_WORK_MASK), REG2
	* andcc REG1, REG2, %g0
	* be,pt no_work_to_do
	* nop
	*/
	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
	/* flags bit 1 is available */
	#define TIF_SIGPENDING 2 /* signal pending */
	#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
	#define TIF_PERFCTR 4 /* performance counters active */
	#define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */
	/* flag bit 6 is available */
	#define TIF_32BIT 7 /* 32-bit binary */
	/* flag bit 8 is available */
	#define TIF_SECCOMP 9 /* secure computing */
	#define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */
	/* flag bit 11 is available */
	/* NOTE: Thread flags >= 12 should be ones we have no interest
	* in using in assembly, else we can't use the mask as
	* an immediate value in instructions such as andcc.
	*/
	#define TIF_ABI_PENDING 12
	#define TIF_MEMDIE 13
	#define TIF_POLLING_NRFLAG 14

	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	#define _TIF_PERFCTR (1<<TIF_PERFCTR)
	#define _TIF_UNALIGNED (1<<TIF_UNALIGNED)
	#define _TIF_32BIT (1<<TIF_32BIT)
	#define _TIF_SECCOMP (1<<TIF_SECCOMP)
	#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
	#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
	#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)

	#define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) \| \
	(_TIF_SIGPENDING \| \
	_TIF_NEED_RESCHED \| _TIF_PERFCTR))

	/*
	* Thread-synchronous status.
	*
	* This is different from the flags in that nobody else
	* ever touches our thread-synchronous status, so we don't
	* have to worry about atomic accesses.
	*
	* Note that there are only 8 bits available.
	*/
	#define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */

	#ifndef __ASSEMBLY__
	#define HAVE_SET_RESTORE_SIGMASK 1
	static inline void set_restore_sigmask(void)
	{
	struct thread_info *ti = current_thread_info();
	ti->status \|= TS_RESTORE_SIGMASK;
	set_bit(TIF_SIGPENDING, &ti->flags);
	}
	#endif /* !__ASSEMBLY__ */

	#endif /* __KERNEL__ */

	#endif /* _ASM_THREAD_INFO_H */