C++ spin_is_locked函数代码示例

/*
 * To disconnect a channel, and reflect it back to all who may be waiting.
 *
 * An OPEN is not allowed until XPC_C_DISCONNECTING is cleared by
 * xpc_process_disconnect(), and if set, XPC_C_WDISCONNECT is cleared by
 * xpc_disconnect_wait().
 *
 * THE CHANNEL IS TO BE LOCKED BY THE CALLER AND WILL REMAIN LOCKED UPON RETURN.
 */
void
xpc_disconnect_channel(const int line, struct xpc_channel *ch,
		       enum xp_retval reason, unsigned long *irq_flags)
{
	u32 channel_was_connected = (ch->flags & XPC_C_CONNECTED);

	DBUG_ON(!spin_is_locked(&ch->lock));

	if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_DISCONNECTED))
		return;

	DBUG_ON(!(ch->flags & (XPC_C_CONNECTING | XPC_C_CONNECTED)));

	dev_dbg(xpc_chan, "reason=%d, line=%d, partid=%d, channel=%d\n",
		reason, line, ch->partid, ch->number);

	XPC_SET_REASON(ch, reason, line);

	ch->flags |= (XPC_C_CLOSEREQUEST | XPC_C_DISCONNECTING);
	/* some of these may not have been set */
	ch->flags &= ~(XPC_C_OPENREQUEST | XPC_C_OPENREPLY |
		       XPC_C_ROPENREQUEST | XPC_C_ROPENREPLY |
		       XPC_C_CONNECTING | XPC_C_CONNECTED);

	xpc_arch_ops.send_chctl_closerequest(ch, irq_flags);

	if (channel_was_connected)
		ch->flags |= XPC_C_WASCONNECTED;

	spin_unlock_irqrestore(&ch->lock, *irq_flags);

	/* wake all idle kthreads so they can exit */
	if (atomic_read(&ch->kthreads_idle) > 0) {
		wake_up_all(&ch->idle_wq);

	} else if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
		   !(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) {
		/* start a kthread that will do the xpDisconnecting callout */
		xpc_create_kthreads(ch, 1, 1);
	}

	/* wake those waiting to allocate an entry from the local msg queue */
	if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
		wake_up(&ch->msg_allocate_wq);

	spin_lock_irqsave(&ch->lock, *irq_flags);
}

static void
xfs_perag_clear_reclaim_tag(
	struct xfs_perag	*pag)
{
	struct xfs_mount	*mp = pag->pag_mount;

	ASSERT(spin_is_locked(&pag->pag_ici_lock));
	if (--pag->pag_ici_reclaimable)
		return;

	/* clear the reclaim tag from the perag radix tree */
	spin_lock(&mp->m_perag_lock);
	radix_tree_tag_clear(&mp->m_perag_tree, pag->pag_agno,
			     XFS_ICI_RECLAIM_TAG);
	spin_unlock(&mp->m_perag_lock);
	trace_xfs_perag_clear_reclaim(mp, pag->pag_agno, -1, _RET_IP_);
}

/*
 * Free up msg_slots and clear other stuff that were setup for the specified
 * channel.
 */
static void
xpc_teardown_msg_structures_uv(struct xpc_channel *ch)
{
	struct xpc_channel_uv *ch_uv = &ch->sn.uv;

	DBUG_ON(!spin_is_locked(&ch->lock));

	kfree(ch_uv->cached_notify_gru_mq_desc);
	ch_uv->cached_notify_gru_mq_desc = NULL;

	if (ch->flags & XPC_C_SETUP) {
		xpc_init_fifo_uv(&ch_uv->msg_slot_free_list);
		kfree(ch_uv->send_msg_slots);
		xpc_init_fifo_uv(&ch_uv->recv_msg_list);
		kfree(ch_uv->recv_msg_slots);
	}
}

/*
 * Allocate and initialise an xfs_inode.
 */
struct xfs_inode *
xfs_inode_alloc(
	struct xfs_mount	*mp,
	xfs_ino_t		ino)
{
	struct xfs_inode	*ip;

	/*
	 * if this didn't occur in transactions, we could use
	 * KM_MAYFAIL and return NULL here on ENOMEM. Set the
	 * code up to do this anyway.
	 */
	ip = kmem_zone_alloc(xfs_inode_zone, KM_SLEEP);
	if (!ip)
		return NULL;
	if (inode_init_always(mp->m_super, VFS_I(ip))) {
		kmem_zone_free(xfs_inode_zone, ip);
		return NULL;
	}

	/* VFS doesn't initialise i_mode! */
	VFS_I(ip)->i_mode = 0;

	XFS_STATS_INC(mp, vn_active);
	ASSERT(atomic_read(&ip->i_pincount) == 0);
	ASSERT(!spin_is_locked(&ip->i_flags_lock));
	ASSERT(!xfs_isiflocked(ip));
	ASSERT(ip->i_ino == 0);

	mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino);

	/* initialise the xfs inode */
	ip->i_ino = ino;
	ip->i_mount = mp;
	memset(&ip->i_imap, 0, sizeof(struct xfs_imap));
	ip->i_afp = NULL;
	ip->i_cowfp = NULL;
	ip->i_cnextents = 0;
	ip->i_cformat = XFS_DINODE_FMT_EXTENTS;
	memset(&ip->i_df, 0, sizeof(xfs_ifork_t));
	ip->i_flags = 0;
	ip->i_delayed_blks = 0;
	memset(&ip->i_d, 0, sizeof(ip->i_d));

	return ip;
}

/*
 * caller must hold spinlock
 */
static
void ctx_unhash_pf(struct ptlrpc_cli_ctx *ctx, struct hlist_head *freelist)
{
	LASSERT(spin_is_locked(&ctx->cc_sec->ps_lock));
	LASSERT(atomic_read(&ctx->cc_refcount) > 0);
	LASSERT(test_bit(PTLRPC_CTX_CACHED_BIT, &ctx->cc_flags));
	LASSERT(!hlist_unhashed(&ctx->cc_cache));

	clear_bit(PTLRPC_CTX_CACHED_BIT, &ctx->cc_flags);

	if (atomic_dec_and_test(&ctx->cc_refcount)) {
		__hlist_del(&ctx->cc_cache);
		hlist_add_head(&ctx->cc_cache, freelist);
	} else {
		hlist_del_init(&ctx->cc_cache);
	}
}

/*
 * Allocate and initialise an xfs_inode.
 */
STATIC struct xfs_inode *
xfs_inode_alloc(
	struct xfs_mount	*mp,
	xfs_ino_t		ino)
{
	struct xfs_inode	*ip;

	/*
	 * if this didn't occur in transactions, we could use
	 * KM_MAYFAIL and return NULL here on ENOMEM. Set the
	 * code up to do this anyway.
	 */
	ip = kmem_zone_alloc(xfs_inode_zone, KM_SLEEP);
	if (!ip)
		return NULL;
	if (inode_init_always(mp->m_super, VFS_I(ip))) {
		kmem_zone_free(xfs_inode_zone, ip);
		return NULL;
	}

	ASSERT(atomic_read(&ip->i_iocount) == 0);
	ASSERT(atomic_read(&ip->i_pincount) == 0);
	ASSERT(!spin_is_locked(&ip->i_flags_lock));
	ASSERT(completion_done(&ip->i_flush));
	ASSERT(ip->i_ino == 0);

	mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino);
	lockdep_set_class_and_name(&ip->i_iolock.mr_lock,
			&xfs_iolock_active, "xfs_iolock_active");

	/* initialise the xfs inode */
	ip->i_ino = ino;
	ip->i_mount = mp;
	memset(&ip->i_imap, 0, sizeof(struct xfs_imap));
	ip->i_afp = NULL;
	memset(&ip->i_df, 0, sizeof(xfs_ifork_t));
	ip->i_flags = 0;
	ip->i_update_core = 0;
	ip->i_delayed_blks = 0;
	memset(&ip->i_d, 0, sizeof(xfs_icdinode_t));
	ip->i_size = 0;
	ip->i_new_size = 0;

	return ip;
}

void aee_sram_fiq_save_bin(const char *msg, size_t len)
{
	int delay = 100;
	char bin_buffer[4];
	struct ram_console_buffer *buffer = ram_console_buffer;	

	if(FIQ_log_size + len > CONFIG_MTK_RAM_CONSOLE_SIZE)
	{
		return;
	}
	
	if(len > 0xffff)
	{
		return;
	}

	if(len%4 !=0)
	{
		len -= len%4;
	}
	
	if(!atomic_read(&rc_in_fiq))
	{
		atomic_set(&rc_in_fiq, 1);
	}

	while ((delay > 0) && (spin_is_locked(&ram_console_lock))) {
		udelay(1);
		delay--;
	}

	// bin buffer flag 00ff
	bin_buffer[0] = 0x00;
	bin_buffer[1] = 0xff;
	// bin buffer size
	bin_buffer[2] = len/255;
	bin_buffer[3] = len%255;	
	
	sram_log_save(bin_buffer, 4);
	sram_log_save(msg, len);	
	FIQ_log_size = FIQ_log_size + len +4;
	buffer->bin_log_count += len;
	

}

/*
 * Process a connect message from a remote partition.
 *
 * Note: xpc_process_connect() is expecting to be called with the
 * spin_lock_irqsave held and will leave it locked upon return.
 */
static void
xpc_process_connect(struct xpc_channel *ch, unsigned long *irq_flags)
{
	enum xp_retval ret;

	DBUG_ON(!spin_is_locked(&ch->lock));

	if (!(ch->flags & XPC_C_OPENREQUEST) ||
	    !(ch->flags & XPC_C_ROPENREQUEST)) {
		/* nothing more to do for now */
		return;
	}
	DBUG_ON(!(ch->flags & XPC_C_CONNECTING));

	if (!(ch->flags & XPC_C_SETUP)) {
		spin_unlock_irqrestore(&ch->lock, *irq_flags);
		ret = xpc_setup_msg_structures(ch);
		spin_lock_irqsave(&ch->lock, *irq_flags);

		if (ret != xpSuccess)
			XPC_DISCONNECT_CHANNEL(ch, ret, irq_flags);

		ch->flags |= XPC_C_SETUP;

		if (ch->flags & (XPC_C_CONNECTED | XPC_C_DISCONNECTING))
			return;
	}

	if (!(ch->flags & XPC_C_OPENREPLY)) {
		ch->flags |= XPC_C_OPENREPLY;
		xpc_send_chctl_openreply(ch, irq_flags);
	}

	if (!(ch->flags & XPC_C_ROPENREPLY))
		return;

	ch->flags = (XPC_C_CONNECTED | XPC_C_SETUP);	/* clear all else */

	dev_info(xpc_chan, "channel %d to partition %d connected\n",
		 ch->number, ch->partid);

	spin_unlock_irqrestore(&ch->lock, *irq_flags);
	xpc_create_kthreads(ch, 1, 0);
	spin_lock_irqsave(&ch->lock, *irq_flags);
}

/* used by __split_huge_page_refcount() */
void lru_add_page_tail(struct zone* zone,
		       struct page *page, struct page *page_tail)
{
	int active;
	enum lru_list lru;
	const int file = 0;

	VM_BUG_ON(!PageHead(page));
	VM_BUG_ON(PageCompound(page_tail));
	VM_BUG_ON(PageLRU(page_tail));
	VM_BUG_ON(!spin_is_locked(&zone->lru_lock));

	SetPageLRU(page_tail);

	if (page_evictable(page_tail, NULL)) {
		if (PageActive(page)) {
			SetPageActive(page_tail);
			active = 1;
			lru = LRU_ACTIVE_ANON;
		} else {
			active = 0;
			lru = LRU_INACTIVE_ANON;
		}
		update_page_reclaim_stat(zone, page_tail, file, active);
	} else {
		SetPageUnevictable(page_tail);
		lru = LRU_UNEVICTABLE;
	}

	if (likely(PageLRU(page)))
		list_add_tail(&page_tail->lru, &page->lru);
	else {
		struct list_head *list_head;
		/*
		 * Head page has not yet been counted, as an hpage,
		 * so we must account for each subpage individually.
		 *
		 * Use the standard add function to put page_tail on the list,
		 * but then correct its position so they all end up in order.
		 */
		add_page_to_lru_list(zone, page_tail, lru);
		list_head = page_tail->lru.prev;
		list_move_tail(&page_tail->lru, list_head);
	}
}

void
xfs_inode_free(
    struct xfs_inode	*ip)
{
    switch (ip->i_d.di_mode & S_IFMT) {
    case S_IFREG:
    case S_IFDIR:
    case S_IFLNK:
        xfs_idestroy_fork(ip, XFS_DATA_FORK);
        break;
    }

    if (ip->i_afp)
        xfs_idestroy_fork(ip, XFS_ATTR_FORK);

    if (ip->i_itemp) {
        /*
         * Only if we are shutting down the fs will we see an
         * inode still in the AIL. If it is there, we should remove
         * it to prevent a use-after-free from occurring.
         */
        xfs_log_item_t	*lip = &ip->i_itemp->ili_item;
        struct xfs_ail	*ailp = lip->li_ailp;

        ASSERT(((lip->li_flags & XFS_LI_IN_AIL) == 0) ||
               XFS_FORCED_SHUTDOWN(ip->i_mount));
        if (lip->li_flags & XFS_LI_IN_AIL) {
            spin_lock(&ailp->xa_lock);
            if (lip->li_flags & XFS_LI_IN_AIL)
                xfs_trans_ail_delete(ailp, lip);
            else
                spin_unlock(&ailp->xa_lock);
        }
        xfs_inode_item_destroy(ip);
        ip->i_itemp = NULL;
    }

    /* asserts to verify all state is correct here */
    ASSERT(atomic_read(&ip->i_iocount) == 0);
    ASSERT(atomic_read(&ip->i_pincount) == 0);
    ASSERT(!spin_is_locked(&ip->i_flags_lock));
    ASSERT(completion_done(&ip->i_flush));

    kmem_zone_free(xfs_inode_zone, ip);
}

static void rtc_update_irq(RTCState *s)
{
    ASSERT(spin_is_locked(&s->lock));

    if ( rtc_mode_is(s, strict) && (s->hw.cmos_data[RTC_REG_C] & RTC_IRQF) )
        return;

    /* IRQ is raised if any source is both raised & enabled */
    if ( !(s->hw.cmos_data[RTC_REG_B] &
           s->hw.cmos_data[RTC_REG_C] &
           (RTC_PF | RTC_AF | RTC_UF)) )
        return;

    s->hw.cmos_data[RTC_REG_C] |= RTC_IRQF;
    if ( rtc_mode_is(s, no_ack) )
        hvm_isa_irq_deassert(vrtc_domain(s), RTC_IRQ);
    hvm_isa_irq_assert(vrtc_domain(s), RTC_IRQ);
}

void
xfs_inode_free(
	struct xfs_inode	*ip)
{
	switch (ip->i_d.di_mode & S_IFMT) {
	case S_IFREG:
	case S_IFDIR:
	case S_IFLNK:
		xfs_idestroy_fork(ip, XFS_DATA_FORK);
		break;
	}

	if (ip->i_afp)
		xfs_idestroy_fork(ip, XFS_ATTR_FORK);

	if (ip->i_itemp) {
		xfs_log_item_t	*lip = &ip->i_itemp->ili_item;
		struct xfs_ail	*ailp = lip->li_ailp;

		ASSERT(((lip->li_flags & XFS_LI_IN_AIL) == 0) ||
				       XFS_FORCED_SHUTDOWN(ip->i_mount));
		if (lip->li_flags & XFS_LI_IN_AIL) {
			spin_lock(&ailp->xa_lock);
			if (lip->li_flags & XFS_LI_IN_AIL)
				xfs_trans_ail_delete(ailp, lip);
			else
				spin_unlock(&ailp->xa_lock);
		}
		xfs_inode_item_destroy(ip);
		ip->i_itemp = NULL;
	}

	
	ASSERT(atomic_read(&ip->i_pincount) == 0);
	ASSERT(!spin_is_locked(&ip->i_flags_lock));
	ASSERT(!xfs_isiflocked(ip));

	spin_lock(&ip->i_flags_lock);
	ip->i_flags = XFS_IRECLAIM;
	ip->i_ino = 0;
	spin_unlock(&ip->i_flags_lock);

	call_rcu(&VFS_I(ip)->i_rcu, xfs_inode_free_callback);
}

static int __ccif_v1_de_init(ccif_t* ccif)
{
    // Disable ccif irq, no need for there is kernel waring of free already-free irq when free_irq
    //ccif->ccif_dis_intr(ccif);

    // Check if TOP half is running
    while(test_bit(CCIF_TOP_HALF_RUNNING,&ccif->m_status))
        yield();

    WARN_ON(spin_is_locked(&ccif->m_lock));

    // Un-register irq
    free_irq(ccif->m_irq_id,ccif);

    // Free memory
    kfree(ccif);

    return 0;
}

static void __domain_finalise_shutdown(struct domain *d)
{
    struct vcpu *v;

    BUG_ON(!spin_is_locked(&d->shutdown_lock));

    if ( d->is_shut_down )
        return;

    for_each_vcpu ( d, v )
        if ( !v->paused_for_shutdown )
            return;

    d->is_shut_down = 1;
    if ( (d->shutdown_code == SHUTDOWN_suspend) && d->suspend_evtchn )
        evtchn_send(d, d->suspend_evtchn);
    else
        send_global_virq(VIRQ_DOM_EXC);
}

static inline void vcpu_runstate_change(
    struct vcpu *v, int new_state, s_time_t new_entry_time)
{
    s_time_t delta;

    ASSERT(v->runstate.state != new_state);
    ASSERT(spin_is_locked(&per_cpu(schedule_data,v->processor).schedule_lock));

    trace_runstate_change(v, new_state);

    delta = new_entry_time - v->runstate.state_entry_time;
    if ( delta > 0 )
    {
        v->runstate.time[v->runstate.state] += delta;
        v->runstate.state_entry_time = new_entry_time;
    }

    v->runstate.state = new_state;
}