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Date:   Fri, 30 Mar 2018 20:00:30 +0100 (BST)
From:   James Simmons <jsimmons@infradead.org>
To:     NeilBrown <neilb@suse.com>
cc:     Oleg Drokin <oleg.drokin@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Andreas Dilger <andreas.dilger@intel.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Lustre Development List <lustre-devel@lists.lustre.org>
Subject: Re: [PATCH 10/17] staging: lustre: libcfs: discard
 cfs_time_add/sub
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References: <152229732768.27689.4800156943561963977.stgit@noble> <152229760858.27689.1121127347892062619.stgit@noble>
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> cfs_time_add adds its arguments.
> cfs_time_sub subtracts finds the difference.
> Discard these and use '+' and '-' directly.
> 
> This change highlighted a type error.  The structure field
> cr_queued_time was used to store jiffies, but was declared
> as time_t (meant for seconds).  So the time is changed to
> "unsigned long".

Reviewed-by: James Simmons <jsimmons@infradead.org>
 
> Signed-off-by: NeilBrown <neilb@suse.com>
> ---
>  .../lustre/include/linux/libcfs/libcfs_time.h      |   12 +---------
>  .../lustre/include/linux/libcfs/linux/linux-time.h |    8 +------
>  .../staging/lustre/lnet/klnds/socklnd/socklnd.c    |    2 +-
>  .../staging/lustre/lnet/klnds/socklnd/socklnd_cb.c |   23 +++++++-------------
>  drivers/staging/lustre/lnet/lnet/lib-move.c        |    6 ++---
>  drivers/staging/lustre/lnet/lnet/router.c          |    5 ++--
>  drivers/staging/lustre/lnet/lnet/router_proc.c     |    7 +++---
>  drivers/staging/lustre/lnet/selftest/conrpc.c      |    4 ++-
>  drivers/staging/lustre/lnet/selftest/timer.c       |    2 +-
>  drivers/staging/lustre/lustre/include/lustre_net.h |    5 ++--
>  drivers/staging/lustre/lustre/ldlm/ldlm_lockd.c    |    3 +--
>  drivers/staging/lustre/lustre/ldlm/ldlm_request.c  |    8 +++----
>  drivers/staging/lustre/lustre/osc/osc_object.c     |    3 +--
>  drivers/staging/lustre/lustre/ptlrpc/pinger.c      |    9 +++-----
>  drivers/staging/lustre/lustre/ptlrpc/service.c     |    2 +-
>  15 files changed, 32 insertions(+), 67 deletions(-)
> 
> diff --git a/drivers/staging/lustre/include/linux/libcfs/libcfs_time.h b/drivers/staging/lustre/include/linux/libcfs/libcfs_time.h
> index df7a3f13f3b3..7b41a129f041 100644
> --- a/drivers/staging/lustre/include/linux/libcfs/libcfs_time.h
> +++ b/drivers/staging/lustre/include/linux/libcfs/libcfs_time.h
> @@ -40,16 +40,6 @@
>   * generic time manipulation functions.
>   */
>  
> -static inline unsigned long cfs_time_add(unsigned long t, long d)
> -{
> -	return (unsigned long)(t + d);
> -}
> -
> -static inline unsigned long cfs_time_sub(unsigned long t1, unsigned long t2)
> -{
> -	return (unsigned long)(t1 - t2);
> -}
> -
>  static inline int cfs_time_after(unsigned long t1, unsigned long t2)
>  {
>  	return time_before(t2, t1);
> @@ -62,7 +52,7 @@ static inline int cfs_time_aftereq(unsigned long t1, unsigned long t2)
>  
>  static inline unsigned long cfs_time_shift(int seconds)
>  {
> -	return cfs_time_add(jiffies, seconds * HZ);
> +	return jiffies + seconds * HZ;
>  }
>  
>  /*
> diff --git a/drivers/staging/lustre/include/linux/libcfs/linux/linux-time.h b/drivers/staging/lustre/include/linux/libcfs/linux/linux-time.h
> index ba115e8c820f..b3a80531bd71 100644
> --- a/drivers/staging/lustre/include/linux/libcfs/linux/linux-time.h
> +++ b/drivers/staging/lustre/include/linux/libcfs/linux/linux-time.h
> @@ -65,15 +65,9 @@ static inline long cfs_duration_sec(long d)
>  	return d / msecs_to_jiffies(MSEC_PER_SEC);
>  }
>  
> -static inline u64 cfs_time_add_64(u64 t, u64 d)
> -{
> -	return t + d;
> -}
> -
>  static inline u64 cfs_time_shift_64(int seconds)
>  {
> -	return cfs_time_add_64(get_jiffies_64(),
> -			       seconds * HZ);
> +	return get_jiffies_64() + (u64)seconds * HZ;
>  }
>  
>  static inline int cfs_time_before_64(u64 t1, u64 t2)
> diff --git a/drivers/staging/lustre/lnet/klnds/socklnd/socklnd.c b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd.c
> index 0efde0009a15..4546618c1c12 100644
> --- a/drivers/staging/lustre/lnet/klnds/socklnd/socklnd.c
> +++ b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd.c
> @@ -1682,7 +1682,7 @@ ksocknal_destroy_conn(struct ksock_conn *conn)
>  		       libcfs_id2str(conn->ksnc_peer->ksnp_id), conn->ksnc_type,
>  		       &conn->ksnc_ipaddr, conn->ksnc_port,
>  		       iov_iter_count(&conn->ksnc_rx_to), conn->ksnc_rx_nob_left,
> -		       cfs_duration_sec(cfs_time_sub(jiffies, last_rcv)));
> +		       cfs_duration_sec(jiffies - last_rcv));
>  		lnet_finalize(conn->ksnc_peer->ksnp_ni,
>  			      conn->ksnc_cookie, -EIO);
>  		break;
> diff --git a/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_cb.c b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_cb.c
> index f97da4540b51..5b34c7c030ad 100644
> --- a/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_cb.c
> +++ b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_cb.c
> @@ -481,8 +481,7 @@ ksocknal_process_transmit(struct ksock_conn *conn, struct ksock_tx *tx)
>  		LASSERT(conn->ksnc_tx_scheduled);
>  		list_add_tail(&conn->ksnc_tx_list,
>  			      &ksocknal_data.ksnd_enomem_conns);
> -		if (!cfs_time_aftereq(cfs_time_add(jiffies,
> -						   SOCKNAL_ENOMEM_RETRY),
> +		if (!cfs_time_aftereq(jiffies + SOCKNAL_ENOMEM_RETRY,
>  				   ksocknal_data.ksnd_reaper_waketime))
>  			wake_up(&ksocknal_data.ksnd_reaper_waitq);
>  
> @@ -1777,8 +1776,7 @@ ksocknal_connect(struct ksock_route *route)
>  	int retry_later = 0;
>  	int rc = 0;
>  
> -	deadline = cfs_time_add(jiffies,
> -				*ksocknal_tunables.ksnd_timeout * HZ);
> +	deadline = jiffies + *ksocknal_tunables.ksnd_timeout * HZ;
>  
>  	write_lock_bh(&ksocknal_data.ksnd_global_lock);
>  
> @@ -1877,8 +1875,7 @@ ksocknal_connect(struct ksock_route *route)
>  			 */
>  			route->ksnr_retry_interval =
>  				*ksocknal_tunables.ksnd_min_reconnectms * HZ / 1000;
> -			route->ksnr_timeout = cfs_time_add(jiffies,
> -							   route->ksnr_retry_interval);
> +			route->ksnr_timeout = jiffies + route->ksnr_retry_interval;
>  		}
>  
>  		ksocknal_launch_connection_locked(route);
> @@ -1903,8 +1900,7 @@ ksocknal_connect(struct ksock_route *route)
>  		    (long)*ksocknal_tunables.ksnd_max_reconnectms * HZ / 1000);
>  
>  	LASSERT(route->ksnr_retry_interval);
> -	route->ksnr_timeout = cfs_time_add(jiffies,
> -					   route->ksnr_retry_interval);
> +	route->ksnr_timeout = jiffies + route->ksnr_retry_interval;
>  
>  	if (!list_empty(&peer->ksnp_tx_queue) &&
>  	    !peer->ksnp_accepting &&
> @@ -2302,8 +2298,7 @@ ksocknal_send_keepalive_locked(struct ksock_peer *peer)
>  
>  	if (*ksocknal_tunables.ksnd_keepalive <= 0 ||
>  	    time_before(jiffies,
> -			cfs_time_add(peer->ksnp_last_alive,
> -				     *ksocknal_tunables.ksnd_keepalive * HZ)))
> +			peer->ksnp_last_alive + *ksocknal_tunables.ksnd_keepalive * HZ))
>  		return 0;
>  
>  	if (time_before(jiffies, peer->ksnp_send_keepalive))
> @@ -2531,8 +2526,7 @@ ksocknal_reaper(void *arg)
>  		}
>  
>  		/* careful with the jiffy wrap... */
> -		while ((timeout = cfs_time_sub(deadline,
> -					       jiffies)) <= 0) {
> +		while ((timeout = deadline - jiffies) <= 0) {
>  			const int n = 4;
>  			const int p = 1;
>  			int chunk = ksocknal_data.ksnd_peer_hash_size;
> @@ -2557,7 +2551,7 @@ ksocknal_reaper(void *arg)
>  					     ksocknal_data.ksnd_peer_hash_size;
>  			}
>  
> -			deadline = cfs_time_add(deadline, p * HZ);
> +			deadline = deadline + p * HZ;
>  		}
>  
>  		if (nenomem_conns) {
> @@ -2568,8 +2562,7 @@ ksocknal_reaper(void *arg)
>  			 */
>  			timeout = SOCKNAL_ENOMEM_RETRY;
>  		}
> -		ksocknal_data.ksnd_reaper_waketime =
> -			cfs_time_add(jiffies, timeout);
> +		ksocknal_data.ksnd_reaper_waketime = jiffies + timeout;
>  
>  		set_current_state(TASK_INTERRUPTIBLE);
>  		add_wait_queue(&ksocknal_data.ksnd_reaper_waitq, &wait);
> diff --git a/drivers/staging/lustre/lnet/lnet/lib-move.c b/drivers/staging/lustre/lnet/lnet/lib-move.c
> index 289ed876bd81..5574d2148c9d 100644
> --- a/drivers/staging/lustre/lnet/lnet/lib-move.c
> +++ b/drivers/staging/lustre/lnet/lnet/lib-move.c
> @@ -523,8 +523,7 @@ lnet_peer_is_alive(struct lnet_peer *lp, unsigned long now)
>  	    cfs_time_aftereq(lp->lp_timestamp, lp->lp_last_alive))
>  		return 0;
>  
> -	deadline = cfs_time_add(lp->lp_last_alive,
> -				lp->lp_ni->ni_peertimeout * HZ);
> +	deadline = lp->lp_last_alive + lp->lp_ni->ni_peertimeout * HZ;
>  	alive = cfs_time_after(deadline, now);
>  
>  	/* Update obsolete lp_alive except for routers assumed to be dead
> @@ -561,8 +560,7 @@ lnet_peer_alive_locked(struct lnet_peer *lp)
>  		static const int lnet_queryinterval = 1;
>  
>  		unsigned long next_query =
> -			   cfs_time_add(lp->lp_last_query,
> -					lnet_queryinterval * HZ);
> +			   lp->lp_last_query + lnet_queryinterval * HZ;
>  
>  		if (time_before(now, next_query)) {
>  			if (lp->lp_alive)
> diff --git a/drivers/staging/lustre/lnet/lnet/router.c b/drivers/staging/lustre/lnet/lnet/router.c
> index ac9b392a0afa..4595a7ad4336 100644
> --- a/drivers/staging/lustre/lnet/lnet/router.c
> +++ b/drivers/staging/lustre/lnet/lnet/router.c
> @@ -1010,8 +1010,7 @@ lnet_ping_router_locked(struct lnet_peer *rtr)
>  	       rtr->lp_alive, rtr->lp_alive_count, rtr->lp_ping_timestamp);
>  
>  	if (secs && !rtr->lp_ping_notsent &&
> -	    cfs_time_after(now, cfs_time_add(rtr->lp_ping_timestamp,
> -					     secs * HZ))) {
> +	    cfs_time_after(now, rtr->lp_ping_timestamp + secs * HZ)) {
>  		int rc;
>  		struct lnet_process_id id;
>  		struct lnet_handle_md mdh;
> @@ -1753,7 +1752,7 @@ lnet_notify(struct lnet_ni *ni, lnet_nid_t nid, int alive, unsigned long when)
>  		CWARN("Ignoring prediction from %s of %s %s %ld seconds in the future\n",
>  		      !ni ? "userspace" : libcfs_nid2str(ni->ni_nid),
>  		      libcfs_nid2str(nid), alive ? "up" : "down",
> -		      cfs_duration_sec(cfs_time_sub(when, now)));
> +		      cfs_duration_sec(when - now));
>  		return -EINVAL;
>  	}
>  
> diff --git a/drivers/staging/lustre/lnet/lnet/router_proc.c b/drivers/staging/lustre/lnet/lnet/router_proc.c
> index 315d067540c0..e4172311be68 100644
> --- a/drivers/staging/lustre/lnet/lnet/router_proc.c
> +++ b/drivers/staging/lustre/lnet/lnet/router_proc.c
> @@ -331,8 +331,7 @@ static int proc_lnet_routers(struct ctl_table *table, int write,
>  			int alive_cnt = peer->lp_alive_count;
>  			int alive = peer->lp_alive;
>  			int pingsent = !peer->lp_ping_notsent;
> -			int last_ping = cfs_duration_sec(cfs_time_sub(now,
> -						     peer->lp_ping_timestamp));
> +			int last_ping = cfs_duration_sec(now - peer->lp_ping_timestamp);
>  			int down_ni = 0;
>  			struct lnet_route *rtr;
>  
> @@ -364,7 +363,7 @@ static int proc_lnet_routers(struct ctl_table *table, int write,
>  					      nrefs, nrtrrefs, alive_cnt,
>  					      alive ? "up" : "down", last_ping,
>  					      pingsent,
> -					      cfs_duration_sec(cfs_time_sub(deadline, now)),
> +					      cfs_duration_sec(deadline - now),
>  					      down_ni, libcfs_nid2str(nid));
>  			LASSERT(tmpstr + tmpsiz - s > 0);
>  		}
> @@ -512,7 +511,7 @@ static int proc_lnet_peers(struct ctl_table *table, int write,
>  				unsigned long now = jiffies;
>  				long delta;
>  
> -				delta = cfs_time_sub(now, peer->lp_last_alive);
> +				delta = now - peer->lp_last_alive;
>  				lastalive = cfs_duration_sec(delta);
>  
>  				/* No need to mess up peers contents with
> diff --git a/drivers/staging/lustre/lnet/selftest/conrpc.c b/drivers/staging/lustre/lnet/selftest/conrpc.c
> index 68e06e06857d..ea4944b9108b 100644
> --- a/drivers/staging/lustre/lnet/selftest/conrpc.c
> +++ b/drivers/staging/lustre/lnet/selftest/conrpc.c
> @@ -500,8 +500,8 @@ lstcon_rpc_trans_interpreter(struct lstcon_rpc_trans *trans,
>  
>  		nd = crpc->crp_node;
>  
> -		dur = (long)cfs_time_sub(crpc->crp_stamp,
> -		      (unsigned long)console_session.ses_id.ses_stamp);
> +		dur = (long)(crpc->crp_stamp -
> +			     (unsigned long)console_session.ses_id.ses_stamp);
>  		jiffies_to_timeval(dur, &tv);
>  
>  		if (copy_to_user(&ent->rpe_peer, &nd->nd_id,
> diff --git a/drivers/staging/lustre/lnet/selftest/timer.c b/drivers/staging/lustre/lnet/selftest/timer.c
> index 1b2c5fc81358..1f9d5487e2f5 100644
> --- a/drivers/staging/lustre/lnet/selftest/timer.c
> +++ b/drivers/staging/lustre/lnet/selftest/timer.c
> @@ -157,7 +157,7 @@ stt_check_timers(unsigned long *last)
>  
>  	while (cfs_time_aftereq(this_slot, *last)) {
>  		expired += stt_expire_list(STTIMER_SLOT(this_slot), now);
> -		this_slot = cfs_time_sub(this_slot, STTIMER_SLOTTIME);
> +		this_slot = this_slot - STTIMER_SLOTTIME;
>  	}
>  
>  	*last = now & STTIMER_SLOTTIMEMASK;
> diff --git a/drivers/staging/lustre/lustre/include/lustre_net.h b/drivers/staging/lustre/lustre/include/lustre_net.h
> index f4824d8ec741..d13db55b7242 100644
> --- a/drivers/staging/lustre/lustre/include/lustre_net.h
> +++ b/drivers/staging/lustre/lustre/include/lustre_net.h
> @@ -556,7 +556,7 @@ struct ptlrpc_cli_req {
>  	/** optional time limit for send attempts */
>  	long				 cr_delay_limit;
>  	/** time request was first queued */
> -	time_t				 cr_queued_time;
> +	unsigned long			 cr_queued_time;
>  	/** request sent timeval */
>  	struct timespec64		 cr_sent_tv;
>  	/** time for request really sent out */
> @@ -2253,8 +2253,7 @@ static inline int ptlrpc_req_get_repsize(struct ptlrpc_request *req)
>  static inline int ptlrpc_send_limit_expired(struct ptlrpc_request *req)
>  {
>  	if (req->rq_delay_limit != 0 &&
> -	    time_before(cfs_time_add(req->rq_queued_time,
> -				     req->rq_delay_limit * HZ),
> +	    time_before(req->rq_queued_time + req->rq_delay_limit * HZ,
>  			jiffies)) {
>  		return 1;
>  	}
> diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_lockd.c b/drivers/staging/lustre/lustre/ldlm/ldlm_lockd.c
> index ab4dd15c8dd4..150e78c9eb68 100644
> --- a/drivers/staging/lustre/lustre/ldlm/ldlm_lockd.c
> +++ b/drivers/staging/lustre/lustre/ldlm/ldlm_lockd.c
> @@ -326,8 +326,7 @@ static void ldlm_handle_gl_callback(struct ptlrpc_request *req,
>  	if (lock->l_granted_mode == LCK_PW &&
>  	    !lock->l_readers && !lock->l_writers &&
>  	    cfs_time_after(jiffies,
> -			   cfs_time_add(lock->l_last_used,
> -					10 * HZ))) {
> +			   lock->l_last_used + 10 * HZ)) {
>  		unlock_res_and_lock(lock);
>  		if (ldlm_bl_to_thread_lock(ns, NULL, lock))
>  			ldlm_handle_bl_callback(ns, NULL, lock);
> diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_request.c b/drivers/staging/lustre/lustre/ldlm/ldlm_request.c
> index 0e1b21c1f06d..6eb42f16040d 100644
> --- a/drivers/staging/lustre/lustre/ldlm/ldlm_request.c
> +++ b/drivers/staging/lustre/lustre/ldlm/ldlm_request.c
> @@ -1176,13 +1176,12 @@ static enum ldlm_policy_res ldlm_cancel_lrur_policy(struct ldlm_namespace *ns,
>  	 * Despite of the LV, It doesn't make sense to keep the lock which
>  	 * is unused for ns_max_age time.
>  	 */
> -	if (cfs_time_after(jiffies,
> -			   cfs_time_add(lock->l_last_used, ns->ns_max_age)))
> +	if (cfs_time_after(jiffies, lock->l_last_used + ns->ns_max_age))
>  		return LDLM_POLICY_CANCEL_LOCK;
>  
>  	slv = ldlm_pool_get_slv(pl);
>  	lvf = ldlm_pool_get_lvf(pl);
> -	la = cfs_duration_sec(cfs_time_sub(cur, lock->l_last_used));
> +	la = cfs_duration_sec(cur - lock->l_last_used);
>  	lv = lvf * la * unused;
>  
>  	/* Inform pool about current CLV to see it via debugfs. */
> @@ -1233,8 +1232,7 @@ static enum ldlm_policy_res ldlm_cancel_aged_policy(struct ldlm_namespace *ns,
>  						    int count)
>  {
>  	if ((added >= count) &&
> -	    time_before(jiffies,
> -			cfs_time_add(lock->l_last_used, ns->ns_max_age)))
> +	    time_before(jiffies, lock->l_last_used + ns->ns_max_age))
>  		return LDLM_POLICY_KEEP_LOCK;
>  
>  	return LDLM_POLICY_CANCEL_LOCK;
> diff --git a/drivers/staging/lustre/lustre/osc/osc_object.c b/drivers/staging/lustre/lustre/osc/osc_object.c
> index c5dc894a4c1b..154d1721636e 100644
> --- a/drivers/staging/lustre/lustre/osc/osc_object.c
> +++ b/drivers/staging/lustre/lustre/osc/osc_object.c
> @@ -327,8 +327,7 @@ int osc_object_is_contended(struct osc_object *obj)
>  	 * I like copy-paste. the code is copied from
>  	 * ll_file_is_contended.
>  	 */
> -	retry_time = cfs_time_add(obj->oo_contention_time,
> -				  osc_contention_time * HZ);
> +	retry_time = obj->oo_contention_time + osc_contention_time * HZ;
>  	if (cfs_time_after(cur_time, retry_time)) {
>  		osc_object_clear_contended(obj);
>  		return 0;
> diff --git a/drivers/staging/lustre/lustre/ptlrpc/pinger.c b/drivers/staging/lustre/lustre/ptlrpc/pinger.c
> index 57c7db47e249..e836591c5936 100644
> --- a/drivers/staging/lustre/lustre/ptlrpc/pinger.c
> +++ b/drivers/staging/lustre/lustre/ptlrpc/pinger.c
> @@ -141,8 +141,7 @@ static long pinger_check_timeout(unsigned long time)
>  	}
>  	mutex_unlock(&pinger_mutex);
>  
> -	return cfs_time_sub(cfs_time_add(time, timeout * HZ),
> -					 jiffies);
> +	return time + timeout * HZ - jiffies;
>  }
>  
>  static bool ir_up;
> @@ -238,8 +237,7 @@ static void ptlrpc_pinger_main(struct work_struct *ws)
>  			/* obd_timeout might have changed */
>  			if (imp->imp_pingable && imp->imp_next_ping &&
>  			    cfs_time_after(imp->imp_next_ping,
> -					   cfs_time_add(this_ping,
> -							PING_INTERVAL * HZ)))
> +					   this_ping + PING_INTERVAL * HZ))
>  				ptlrpc_update_next_ping(imp, 0);
>  		}
>  		mutex_unlock(&pinger_mutex);
> @@ -255,8 +253,7 @@ static void ptlrpc_pinger_main(struct work_struct *ws)
>  		 */
>  		CDEBUG(D_INFO, "next wakeup in " CFS_DURATION_T " (%ld)\n",
>  		       time_to_next_wake,
> -		       cfs_time_add(this_ping,
> -				    PING_INTERVAL * HZ));
> +		       this_ping + PING_INTERVAL * HZ);
>  	} while (time_to_next_wake <= 0);
>  
>  	queue_delayed_work(pinger_wq, &ping_work,
> diff --git a/drivers/staging/lustre/lustre/ptlrpc/service.c b/drivers/staging/lustre/lustre/ptlrpc/service.c
> index fc29efbd9914..e71046db28e5 100644
> --- a/drivers/staging/lustre/lustre/ptlrpc/service.c
> +++ b/drivers/staging/lustre/lustre/ptlrpc/service.c
> @@ -1153,7 +1153,7 @@ static void ptlrpc_at_check_timed(struct ptlrpc_service_part *svcpt)
>  		spin_unlock(&svcpt->scp_at_lock);
>  		return;
>  	}
> -	delay = cfs_time_sub(jiffies, svcpt->scp_at_checktime);
> +	delay = jiffies - svcpt->scp_at_checktime;
>  	svcpt->scp_at_check = 0;
>  
>  	if (array->paa_count == 0) {
> 
> 
>