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13a695a
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arch
alpha
arc
arm
boot
common
configs
crypto
include
asm
hardware
mach
vdso
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arch_gicv3.h
arch_timer.h
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arm-cci.h
asm-offsets.h
assembler.h
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auxvec.h
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barrier.h
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bug.h
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current.h
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50 lines (39 loc) · 1.16 KB
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current.h
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/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (c) 2021 Keith Packard <keithp@keithp.com> * Copyright (c) 2021 Google, LLC <ardb@kernel.org> */ #ifndef _ASM_ARM_CURRENT_H #define _ASM_ARM_CURRENT_H #ifndef __ASSEMBLY__ struct task_struct; static inline void set_current(struct task_struct *cur) { if (!IS_ENABLED(CONFIG_CURRENT_POINTER_IN_TPIDRURO)) return; /* Set TPIDRURO */ asm("mcr p15, 0, %0, c13, c0, 3" :: "r"(cur) : "memory"); } #ifdef CONFIG_CURRENT_POINTER_IN_TPIDRURO static inline struct task_struct *get_current(void) { struct task_struct *cur; #if __has_builtin(__builtin_thread_pointer) /* * Use the __builtin helper when available - this results in better * code, especially when using GCC in combination with the per-task * stack protector, as the compiler will recognize that it needs to * load the TLS register only once in every function. */ cur = __builtin_thread_pointer(); #else asm("mrc p15, 0, %0, c13, c0, 3" : "=r"(cur)); #endif return cur; } #define current get_current() #else #include <asm-generic/current.h> #endif /* CONFIG_CURRENT_POINTER_IN_TPIDRURO */ #endif /* __ASSEMBLY__ */ #endif /* _ASM_ARM_CURRENT_H */
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