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https://gitee.com/bianbu-linux/linux-6.6
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42a20f86dc
Having a stable wchan means the process must be blocked and for it to stay that way while performing stack unwinding. Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> [arm] Tested-by: Mark Rutland <mark.rutland@arm.com> [arm64] Link: https://lkml.kernel.org/r/20211008111626.332092234@infradead.org
80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* include/asm-alpha/processor.h
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*
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* Copyright (C) 1994 Linus Torvalds
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*/
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#ifndef __ASM_ALPHA_PROCESSOR_H
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#define __ASM_ALPHA_PROCESSOR_H
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#include <linux/personality.h> /* for ADDR_LIMIT_32BIT */
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/*
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* We have a 42-bit user address space: 4TB user VM...
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*/
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#define TASK_SIZE (0x40000000000UL)
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#define STACK_TOP \
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(current->personality & ADDR_LIMIT_32BIT ? 0x80000000 : 0x00120000000UL)
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#define STACK_TOP_MAX 0x00120000000UL
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/* This decides where the kernel will search for a free chunk of vm
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* space during mmap's.
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*/
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#define TASK_UNMAPPED_BASE \
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((current->personality & ADDR_LIMIT_32BIT) ? 0x40000000 : TASK_SIZE / 2)
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typedef struct {
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unsigned long seg;
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} mm_segment_t;
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/* This is dead. Everything has been moved to thread_info. */
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struct thread_struct { };
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#define INIT_THREAD { }
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/* Do necessary setup to start up a newly executed thread. */
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struct pt_regs;
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extern void start_thread(struct pt_regs *, unsigned long, unsigned long);
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/* Free all resources held by a thread. */
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struct task_struct;
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extern void release_thread(struct task_struct *);
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unsigned long __get_wchan(struct task_struct *p);
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#define KSTK_EIP(tsk) (task_pt_regs(tsk)->pc)
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#define KSTK_ESP(tsk) \
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((tsk) == current ? rdusp() : task_thread_info(tsk)->pcb.usp)
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#define cpu_relax() barrier()
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#define ARCH_HAS_PREFETCH
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#define ARCH_HAS_PREFETCHW
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#define ARCH_HAS_SPINLOCK_PREFETCH
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#ifndef CONFIG_SMP
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/* Nothing to prefetch. */
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#define spin_lock_prefetch(lock) do { } while (0)
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#endif
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extern inline void prefetch(const void *ptr)
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{
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__builtin_prefetch(ptr, 0, 3);
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}
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extern inline void prefetchw(const void *ptr)
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{
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__builtin_prefetch(ptr, 1, 3);
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}
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#ifdef CONFIG_SMP
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extern inline void spin_lock_prefetch(const void *ptr)
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{
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__builtin_prefetch(ptr, 1, 3);
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}
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#endif
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#endif /* __ASM_ALPHA_PROCESSOR_H */
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