MAJOR=4
MINOR=7
DEVNAME=tty7
  *   ˆl–Ü4ý( ©³( 	Å€fàB¦-ÿÁ824_†I|¥+ÁÀ 8    /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
/*
 *  IPv6 RPL-SR implementation
 *
 *  Author:
 *  (C) 2020 Alexander Aring <alex.aring@gmail.com>
 */

#ifndef _UAPI_LINUX_RPL_H
#define _UAPI_LINUX_RPL_H

#include <asm/byteorder.h>
#include <linux/types.h>
#include <linux/in6.h>

/*
 * RPL SR Header
 */
struct ipv6_rpl_sr_hdr {
	__u8	nexthdr;
	__u8	hdrlen;
	__u8	type;
	__u8	segments_left;
#if defined(__LITTLE_ENDIAN_BITFIELD)
	__u32	cmpre:4,
		cmpri:4,
		reserved:4,
		pad:4,
		reserved1:16;
#elif defined(__BIG_ENDIAN_BITFIELD)
	__u32	cmpri:4,
		cmpre:4,
		pad:4,
		reserved:20;
#else
#error  "Please fix <asm/byteorder.h>"
#endif

	union {
		struct in6_addr addr[0];
		__u8 data[0];
	} segments;
} __attribute__((packed));

#define rpl_segaddr	segments.addr
#define rpl_segdata	segments.data

#endif
     ˆ¿Âƒm¶š¾ÁÀ ¨    /* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_U64_STATS_SYNC_H
#define _LINUX_U64_STATS_SYNC_H

/*
 * Protect against 64-bit values tearing on 32-bit architectures. This is
 * typically used for statistics read/update in different subsystems.
 *
 * Key points :
 *
 * -  Use a seqcount on 32-bit
 * -  The whole thing is a no-op on 64-bit architectures.
 *
 * Usage constraints:
 *
 * 1) Write side must ensure mutual exclusion, or one seqcount update could
 *    be lost, thus blocking readers forever.
 *
 * 2) Write side must disable preemption, or a seqcount reader can preempt the
 *    writer and also spin forever.
 *
 * 3) Write side must use the _irqsave() variant if other writers, or a reader,
 *    can be invoked from an IRQ context. On 64bit systems this variant does not
 *    disable interrupts.
 *
 * 4) If reader fetches several counters, there is no guarantee the whole values
 *    are consistent w.r.t. each other (remember point #2: seqcounts are not
 *    used for 64bit architectures).
 *
 * 5) Readers are allowed to sleep or be preempted/interrupted: they perform
 *    pure reads.
 *
 * Usage :
 *
 * Stats producer (writer) should use following template granted it already got
 * an exclusive access to counters (a lock is already taken, or per cpu
 * data is used [in a non preemptable context])
 *
 *   spin_lock_bh(...) or other synchronization to get exclusive access
 *   ...
 *   u64_stats_update_begin(&stats->syncp);
 *   u64_stats_add(&stats->bytes64, len); // non atomic operation
 *   u64_stats_inc(&stats->packets64);    // non atomic operation
 *   u64_stats_update_end(&stats->syncp);
 *
 * While a consumer (reader) should use following template to get consistent
 * snapshot for each variable (but no guarantee on several ones)
 *
 * u64 tbytes, tpackets;
 * unsigned int start;
 *
 * do {
 *         start = u64_stats_fetch_begin(&stats->syncp);
 *         tbytes = u64_stats_read(&stats->bytes64); // non atomic operation
 *         tpackets = u64_stats_read(&stats->packets64); // non atomic operation
 * } while (u64_stats_fetch_retry(&stats->syncp, start));
 *
 *
 * Example of use in drivers/net/loopback.c, using per_cpu containers,
 * in BH disabled context.
 */
#include <linux/seqlock.h>

struct u64_stats_sync {
#if BITS_PER_LONG == 32
	seqcount_t	seq;
#endif
};

#if BITS_PER_LONG == 64
#include <asm/local64.h>

typedef struct {
	local64_t	v;
} u64_stats_t ;

static inline u64 u64_stats_read(const u64_stats_t *p)
{
	return local64_read(&p->v);
}

static inline void u64_stats_set(u64_stats_t *p, u64 val)
{
	local64_set(&p->v, val);
}

static inline void u64_stats_add(u64_stats_t *p, unsigned long val)
{
	local64_add(val, &p->v);
}

static inline void u64_stats_inc(u64_stats_t *p)
{
	local64_inc(&p->v);
}

static inline void u64_stats_init(struct u64_stats_sync *syncp) { }
static inline void __u64_stats_update_begin(struct u64_stats_sync *syncp) { }
static inline void __u64_stats_update_end(struct u64_stats_sync *syncp) { }
static inline unsigned long __u64_stats_irqsave(void) { return 0; }
static inline void __u64_stats_irqrestore(unsigned long flags) { }
static inline unsig