From: WEN Pingbo <pingbo.wen@xxxxxxxxxx> struct timeval is not y2038 safe, and what mlc->instart do is scheduling a task in a fixed timeout, so jiffies is the simplest choice here. In hilse_donode(), the expires in mod_timer equals jiffies + intimeout - (now - instart) If we use jiffies in 'now', the expires equals instart + intimeout So, all we need to do is that making sure expires is a future timestamp before passed it to mod_timer. [arnd: slightly simplified patch further] Link: https://lists.linaro.org/pipermail/y2038/2015-October/000937.html Signed-off-by: WEN Pingbo <pingbo.wen@xxxxxxxxxx> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx> --- drivers/input/serio/hil_mlc.c | 18 +++++++----------- drivers/input/serio/hp_sdc_mlc.c | 5 +---- include/linux/hil_mlc.h | 4 ++-- 3 files changed, 10 insertions(+), 17 deletions(-) diff --git a/drivers/input/serio/hil_mlc.c b/drivers/input/serio/hil_mlc.c index 581e47119363..e1423f7648d6 100644 --- a/drivers/input/serio/hil_mlc.c +++ b/drivers/input/serio/hil_mlc.c @@ -602,8 +602,8 @@ static inline void hilse_setup_input(hil_mlc *mlc, const struct hilse_node *node BUG(); } mlc->istarted = 1; - mlc->intimeout = node->arg; - do_gettimeofday(&(mlc->instart)); + mlc->intimeout = usecs_to_jiffies(node->arg); + mlc->instart = jiffies; mlc->icount = 15; memset(mlc->ipacket, 0, 16 * sizeof(hil_packet)); BUG_ON(down_trylock(&mlc->isem)); @@ -708,7 +708,7 @@ static int hilse_donode(hil_mlc *mlc) break; } mlc->ostarted = 0; - do_gettimeofday(&(mlc->instart)); + mlc->instart = jiffies; write_unlock_irqrestore(&mlc->lock, flags); nextidx = HILSEN_NEXT; break; @@ -729,18 +729,14 @@ static int hilse_donode(hil_mlc *mlc) #endif while (nextidx & HILSEN_SCHED) { - struct timeval tv; + unsigned long now = jiffies; if (!sched_long) goto sched; - do_gettimeofday(&tv); - tv.tv_usec += USEC_PER_SEC * (tv.tv_sec - mlc->instart.tv_sec); - tv.tv_usec -= mlc->instart.tv_usec; - if (tv.tv_usec >= mlc->intimeout) goto sched; - tv.tv_usec = (mlc->intimeout - tv.tv_usec) * HZ / USEC_PER_SEC; - if (!tv.tv_usec) goto sched; - mod_timer(&hil_mlcs_kicker, jiffies + tv.tv_usec); + if (time_after(now, mlc->instart + mlc->intimeout)) + goto sched; + mod_timer(&hil_mlcs_kicker, mlc->instart + mlc->intimeout); break; sched: tasklet_schedule(&hil_mlcs_tasklet); diff --git a/drivers/input/serio/hp_sdc_mlc.c b/drivers/input/serio/hp_sdc_mlc.c index d50f0678bf47..232d30c825bd 100644 --- a/drivers/input/serio/hp_sdc_mlc.c +++ b/drivers/input/serio/hp_sdc_mlc.c @@ -149,7 +149,6 @@ static int hp_sdc_mlc_in(hil_mlc *mlc, suseconds_t timeout) /* Try to down the semaphore */ if (down_trylock(&mlc->isem)) { - struct timeval tv; if (priv->emtestmode) { mlc->ipacket[0] = HIL_ERR_INT | (mlc->opacket & @@ -160,9 +159,7 @@ static int hp_sdc_mlc_in(hil_mlc *mlc, suseconds_t timeout) /* printk(KERN_DEBUG PREFIX ">[%x]\n", mlc->ipacket[0]); */ goto wasup; } - do_gettimeofday(&tv); - tv.tv_usec += USEC_PER_SEC * (tv.tv_sec - mlc->instart.tv_sec); - if (tv.tv_usec - mlc->instart.tv_usec > mlc->intimeout) { + if (time_after(jiffies, mlc->instart + mlc->intimeout)) { /* printk("!%i %i", tv.tv_usec - mlc->instart.tv_usec, mlc->intimeout); diff --git a/include/linux/hil_mlc.h b/include/linux/hil_mlc.h index d6fc839bdf46..774f7d3b8f6a 100644 --- a/include/linux/hil_mlc.h +++ b/include/linux/hil_mlc.h @@ -144,8 +144,8 @@ struct hil_mlc { hil_packet ipacket[16]; hil_packet imatch; int icount; - struct timeval instart; - suseconds_t intimeout; + unsigned long instart; + unsigned long intimeout; int ddi; /* Last operational device id */ int lcv; /* LCV to throttle loops */ -- 2.9.0 -- To unsubscribe from this list: send the line "unsubscribe linux-parisc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
