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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/arch/arm/include/asm/thread_info.h
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@@ -1,11 +1,8 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 /*
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  *  arch/arm/include/asm/thread_info.h
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  *
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  *  Copyright (C) 2002 Russell King.
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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 #ifndef __ASM_ARM_THREAD_INFO_H
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 #define __ASM_ARM_THREAD_INFO_H
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@@ -49,10 +46,14 @@
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 struct thread_info {
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 	unsigned long		flags;		/* low level flags */
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 	int			preempt_count;	/* 0 => preemptable, <0 => bug */
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+	int			preempt_lazy_count; /* 0 => preemptable, <0 => bug */
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 	mm_segment_t		addr_limit;	/* address limit */
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 	struct task_struct	*task;		/* main task structure */
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 	__u32			cpu;		/* cpu */
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 	__u32			cpu_domain;	/* cpu domain */
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+#ifdef CONFIG_STACKPROTECTOR_PER_TASK
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+	unsigned long		stack_canary;
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+#endif
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 	struct cpu_context_save	cpu_context;	/* cpu context */
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 	__u32			syscall;	/* syscall number */
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 	__u8			used_cp[16];	/* thread used copro */
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@@ -74,11 +75,6 @@
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 	.preempt_count	= INIT_PREEMPT_COUNT,				\
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 	.addr_limit	= KERNEL_DS,					\
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 }
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-
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-/*
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- * how to get the current stack pointer in C
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- */
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-register unsigned long current_stack_pointer asm ("sp");
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 /*
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  * how to get the thread information struct from C
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@@ -131,6 +127,8 @@
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  * thread information flags:
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  *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
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  *  TIF_POLLING_NRFLAG	- true if poll_idle() is polling TIF_NEED_RESCHED
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+ *
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+ * Any bit in the range of 0..15 will cause do_work_pending() to be invoked.
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  */
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 #define TIF_SIGPENDING		0	/* signal pending */
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 #define TIF_NEED_RESCHED	1	/* rescheduling necessary */
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@@ -140,8 +138,9 @@
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 #define TIF_SYSCALL_AUDIT	5	/* syscall auditing active */
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 #define TIF_SYSCALL_TRACEPOINT	6	/* syscall tracepoint instrumentation */
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 #define TIF_SECCOMP		7	/* seccomp syscall filtering active */
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+#define TIF_NOTIFY_SIGNAL	8	/* signal notifications exist */
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+#define TIF_NEED_RESCHED_LAZY	9
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-#define TIF_NOHZ		12	/* in adaptive nohz mode */
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 #define TIF_USING_IWMMXT	17
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 #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
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 #define TIF_RESTORE_SIGMASK	20
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@@ -154,6 +153,8 @@
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 #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
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 #define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
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 #define _TIF_SECCOMP		(1 << TIF_SECCOMP)
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+#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
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+#define _TIF_NEED_RESCHED_LAZY	(1 << TIF_NEED_RESCHED_LAZY)
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 #define _TIF_USING_IWMMXT	(1 << TIF_USING_IWMMXT)
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 /* Checks for any syscall work in entry-common.S */
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@@ -164,7 +165,9 @@
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  * Change these and you break ASM code in entry-common.S
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  */
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 #define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
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-				 _TIF_NOTIFY_RESUME | _TIF_UPROBE)
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+				 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
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+				 _TIF_NEED_RESCHED_LAZY | \
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+				 _TIF_NOTIFY_SIGNAL)
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 #endif /* __KERNEL__ */
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 #endif /* __ASM_ARM_THREAD_INFO_H */