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84e7620601
Fix build warnings in VDSO as below:
arch/loongarch/vdso/vgettimeofday.c:9:5: warning: no previous prototype for '__vdso_clock_gettime' [-Wmissing-prototypes]
9 | int __vdso_clock_gettime(clockid_t clock,
| ^~~~~~~~~~~~~~~~~~~~
arch/loongarch/vdso/vgettimeofday.c:15:5: warning: no previous prototype for '__vdso_gettimeofday' [-Wmissing-prototypes]
15 | int __vdso_gettimeofday(struct __kernel_old_timeval *tv,
| ^~~~~~~~~~~~~~~~~~~
arch/loongarch/vdso/vgettimeofday.c:21:5: warning: no previous prototype for '__vdso_clock_getres' [-Wmissing-prototypes]
21 | int __vdso_clock_getres(clockid_t clock_id,
| ^~~~~~~~~~~~~~~~~~~
arch/loongarch/vdso/vgetcpu.c:27:5: warning: no previous prototype for '__vdso_getcpu' [-Wmissing-prototypes]
27 | int __vdso_getcpu(unsigned int *cpu, unsigned int *node, struct getcpu_cache *unused)
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
45 lines
826 B
C
45 lines
826 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Fast user context implementation of getcpu()
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*/
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#include <asm/vdso.h>
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#include <linux/getcpu.h>
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static __always_inline int read_cpu_id(void)
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{
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int cpu_id;
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__asm__ __volatile__(
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" rdtime.d $zero, %0\n"
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: "=r" (cpu_id)
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:
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: "memory");
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return cpu_id;
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}
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static __always_inline const struct vdso_pcpu_data *get_pcpu_data(void)
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{
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return (struct vdso_pcpu_data *)(get_vdso_base() - VDSO_DATA_SIZE);
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}
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extern
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int __vdso_getcpu(unsigned int *cpu, unsigned int *node, struct getcpu_cache *unused);
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int __vdso_getcpu(unsigned int *cpu, unsigned int *node, struct getcpu_cache *unused)
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{
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int cpu_id;
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const struct vdso_pcpu_data *data;
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cpu_id = read_cpu_id();
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if (cpu)
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*cpu = cpu_id;
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if (node) {
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data = get_pcpu_data();
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*node = data[cpu_id].node;
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}
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return 0;
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}
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