0aa2ec8a47
The patch fix commit: ad5d112 ("riscv: use vDSO common flow to
reduce the latency of the time-related functions").
The GENERIC_TIME_VSYSCALL should be CONFIG_GENERIC_TIME_VSYSCALL
or vgettimeofday won't work.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Fixes: ad5d1122b82f ("riscv: use vDSO common flow to reduce the latency of the time-related functions")
Cc: stable@vger.kernel.org
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
35 lines
1003 B
C
35 lines
1003 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 ARM Limited
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* Copyright (C) 2014 Regents of the University of California
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* Copyright (C) 2017 SiFive
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*/
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#ifndef _ASM_RISCV_VDSO_H
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#define _ASM_RISCV_VDSO_H
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#include <linux/types.h>
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#ifndef CONFIG_GENERIC_TIME_VSYSCALL
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struct vdso_data {
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};
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#endif
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/*
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* The VDSO symbols are mapped into Linux so we can just use regular symbol
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* addressing to get their offsets in userspace. The symbols are mapped at an
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* offset of 0, but since the linker must support setting weak undefined
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* symbols to the absolute address 0 it also happens to support other low
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* addresses even when the code model suggests those low addresses would not
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* otherwise be availiable.
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*/
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#define VDSO_SYMBOL(base, name) \
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({ \
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extern const char __vdso_##name[]; \
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(void __user *)((unsigned long)(base) + __vdso_##name); \
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})
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asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t);
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#endif /* _ASM_RISCV_VDSO_H */
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