FM / vdso

/usr/src/linux-headers-5.15.0-190/include/vdso/

/usr/src/linux-headers-5.15.0-190/include/vdso

Name	Size	Mode	Actions
bits.h	171	0644	edit dl rm
clocksource.h	479	0644	edit dl rm
const.h	196	0644	edit dl rm
datapage.h	4219	0644	edit dl rm
helpers.h	1299	0644	edit dl rm
jiffies.h	298	0644	edit dl rm
ktime.h	454	0644	edit dl rm
limits.h	564	0644	edit dl rm
math64.h	468	0644	edit dl rm
processor.h	251	0644	edit dl rm
time.h	190	0644	edit dl rm
time32.h	274	0644	edit dl rm
time64.h	426	0644	edit dl rm
vsyscall.h	288	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-190/include/vdso/helpers.h (1299B)

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __VDSO_HELPERS_H
#define __VDSO_HELPERS_H

#ifndef __ASSEMBLY__

#include <vdso/datapage.h>

static __always_inline u32 vdso_read_begin(const struct vdso_data *vd)
{
	u32 seq;

while (unlikely((seq = READ_ONCE(vd->seq)) & 1))
		cpu_relax();

smp_rmb();
	return seq;
}

static __always_inline u32 vdso_read_retry(const struct vdso_data *vd,
					   u32 start)
{
	u32 seq;

smp_rmb();
	seq = READ_ONCE(vd->seq);
	return seq != start;
}

static __always_inline void vdso_write_begin(struct vdso_data *vd)
{
	/*
	 * WRITE_ONCE it is required otherwise the compiler can validly tear
	 * updates to vd[x].seq and it is possible that the value seen by the
	 * reader it is inconsistent.
	 */
	WRITE_ONCE(vd[CS_HRES_COARSE].seq, vd[CS_HRES_COARSE].seq + 1);
	WRITE_ONCE(vd[CS_RAW].seq, vd[CS_RAW].seq + 1);
	smp_wmb();
}

static __always_inline void vdso_write_end(struct vdso_data *vd)
{
	smp_wmb();
	/*
	 * WRITE_ONCE it is required otherwise the compiler can validly tear
	 * updates to vd[x].seq and it is possible that the value seen by the
	 * reader it is inconsistent.
	 */
	WRITE_ONCE(vd[CS_HRES_COARSE].seq, vd[CS_HRES_COARSE].seq + 1);
	WRITE_ONCE(vd[CS_RAW].seq, vd[CS_RAW].seq + 1);
}

#endif /* !__ASSEMBLY__ */

#endif /* __VDSO_HELPERS_H */

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