Y2038 May 2015

y2038@lists.linaro.org

18 participants
63 discussions

[PATCH] Staging: media: lirc: Replace timeval with ktime_t

by Ksenija Stanojevic

'struct timeval last_tv' is used to get the time of last signal change and 'struct timeval last_intr_tv' is used to get the time of last UART interrupt. 32-bit systems using 'struct timeval' will break in the year 2038, so we have to replace that code with more appropriate types. Here struct timeval is replaced with ktime_t. Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic(a)gmail.com> --- drivers/staging/media/lirc/lirc_sir.c | 75 ++++++++++++++--------------------- 1 file changed, 30 insertions(+), 45 deletions(-) diff --git a/drivers/staging/media/lirc/lirc_sir.c b/drivers/staging/media/lirc/lirc_sir.c index 29087f6..4f326e9 100644 --- a/drivers/staging/media/lirc/lirc_sir.c +++ b/drivers/staging/media/lirc/lirc_sir.c @@ -44,7 +44,7 @@ #include <linux/ioport.h> #include <linux/kernel.h> #include <linux/serial_reg.h> -#include <linux/time.h> +#include <linux/ktime.h> #include <linux/string.h> #include <linux/types.h> #include <linux/wait.h> @@ -127,9 +127,9 @@ static int threshold = 3; static DEFINE_SPINLOCK(timer_lock); static struct timer_list timerlist; /* time of last signal change detected */ -static struct timeval last_tv = {0, 0}; +static ktime_t last; /* time of last UART data ready interrupt */ -static struct timeval last_intr_tv = {0, 0}; +static ktime_t last_intr_time; static int last_value; static DECLARE_WAIT_QUEUE_HEAD(lirc_read_queue); @@ -400,20 +400,6 @@ static void drop_chrdev(void) } /* SECTION: Hardware */ -static long delta(struct timeval *tv1, struct timeval *tv2) -{ - unsigned long deltv; - - deltv = tv2->tv_sec - tv1->tv_sec; - if (deltv > 15) - deltv = 0xFFFFFF; - else - deltv = deltv*1000000 + - tv2->tv_usec - - tv1->tv_usec; - return deltv; -} - static void sir_timeout(unsigned long data) { /* @@ -432,12 +418,14 @@ static void sir_timeout(unsigned long data) /* clear unread bits in UART and restart */ outb(UART_FCR_CLEAR_RCVR, io + UART_FCR); /* determine 'virtual' pulse end: */ - pulse_end = delta(&last_tv, &last_intr_tv); + pulse_end = min_t(unsigned long, + ktime_us_delta(last, last_intr_time), + PULSE_MASK); dev_dbg(driver.dev, "timeout add %d for %lu usec\n", last_value, pulse_end); add_read_queue(last_value, pulse_end); last_value = 0; - last_tv = last_intr_tv; + last = last_intr_time; } spin_unlock_irqrestore(&timer_lock, flags); } @@ -445,9 +433,9 @@ static void sir_timeout(unsigned long data) static irqreturn_t sir_interrupt(int irq, void *dev_id) { unsigned char data; - struct timeval curr_tv; - static unsigned long deltv; - unsigned long deltintrtv; + ktime_t curr_time; + static unsigned long delt; + unsigned long deltintr; unsigned long flags; int iir, lsr; @@ -471,49 +459,46 @@ static irqreturn_t sir_interrupt(int irq, void *dev_id) do { del_timer(&timerlist); data = inb(io + UART_RX); - do_gettimeofday(&curr_tv); - deltv = delta(&last_tv, &curr_tv); - deltintrtv = delta(&last_intr_tv, &curr_tv); + curr_time = ktime_get(); + delt = min_t(unsigned long, + ktime_us_delta(last, curr_time), + PULSE_MASK); + deltintr = min_t(unsigned long, + ktime_us_delta(last_intr_time, + curr_time), + PULSE_MASK); dev_dbg(driver.dev, "t %lu, d %d\n", - deltintrtv, (int)data); + deltintr, (int)data); /* * if nothing came in last X cycles, * it was gap */ - if (deltintrtv > TIME_CONST * threshold) { + if (deltintr > TIME_CONST * threshold) { if (last_value) { dev_dbg(driver.dev, "GAP\n"); /* simulate signal change */ add_read_queue(last_value, - deltv - - deltintrtv); + delt - + deltintr); last_value = 0; - last_tv.tv_sec = - last_intr_tv.tv_sec; - last_tv.tv_usec = - last_intr_tv.tv_usec; - deltv = deltintrtv; + last = last_intr_time; + delt = deltintr; } } data = 1; if (data ^ last_value) { /* - * deltintrtv > 2*TIME_CONST, remember? + * deltintr > 2*TIME_CONST, remember? * the other case is timeout */ add_read_queue(last_value, - deltv-TIME_CONST); + delt-TIME_CONST); last_value = data; - last_tv = curr_tv; - if (last_tv.tv_usec >= TIME_CONST) { - last_tv.tv_usec -= TIME_CONST; - } else { - last_tv.tv_sec--; - last_tv.tv_usec += 1000000 - - TIME_CONST; - } + last = curr_time; + last = ktime_sub_us(last, + TIME_CONST); } - last_intr_tv = curr_tv; + last_intr_time = curr_time; if (data) { /* * start timer for end of -- 1.9.1

9 years, 5 months

[PATCH v2] xen/pcifront: Remove usage of struct timeval

by Tina Ruchandani

struct timeval uses a 32-bit field for representing seconds, which will overflow in the year 2038 and beyond. This patch replaces struct timeval with 64-bit ktime_t which is 2038 safe. The patch is part of a larger effort to remove instances of 32-bit timekeeping variables (timeval, time_t and timespec) from the kernel. Signed-off-by: Tina Ruchandani <ruchandani.tina(a)gmail.com> Suggested-by: Arnd Bergmann <arnd(a)arndb.de> -- Changes in v2: - Use monotonic time (ktime_get_ns()) instead of real time since we only care about elapsed delta here. - Use macro ktime_get_ns() instead of getting ktime_t and converting it to ns. --- drivers/pci/xen-pcifront.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c index 7cfd2db..c4796c8 100644 --- a/drivers/pci/xen-pcifront.c +++ b/drivers/pci/xen-pcifront.c @@ -20,6 +20,7 @@ #include <linux/workqueue.h> #include <linux/bitops.h> #include <linux/time.h> +#include <linux/ktime.h> #include <xen/platform_pci.h> #include <asm/xen/swiotlb-xen.h> @@ -115,7 +116,6 @@ static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op) evtchn_port_t port = pdev->evtchn; unsigned irq = pdev->irq; s64 ns, ns_timeout; - struct timeval tv; spin_lock_irqsave(&pdev->sh_info_lock, irq_flags); @@ -132,8 +132,7 @@ static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op) * (in the latter case we end up continually re-executing poll() with a * timeout in the past). 1s difference gives plenty of slack for error. */ - do_gettimeofday(&tv); - ns_timeout = timeval_to_ns(&tv) + 2 * (s64)NSEC_PER_SEC; + ns_timeout = ktime_get_ns() + 2 * (s64)NSEC_PER_SEC; xen_clear_irq_pending(irq); @@ -141,8 +140,7 @@ static int do_pci_op(struct pcifront_device *pdev, struct xen_pci_op *op) (unsigned long *)&pdev->sh_info->flags)) { xen_poll_irq_timeout(irq, jiffies + 3*HZ); xen_clear_irq_pending(irq); - do_gettimeofday(&tv); - ns = timeval_to_ns(&tv); + ns = ktime_get_ns(); if (ns > ns_timeout) { dev_err(&pdev->xdev->dev, "pciback not responding!!!\n"); -- 2.2.0.rc0.207.ga3a616c

9 years, 5 months

[PATCH v3] [media] dvb-frontend: Replace timeval with ktime_t

by Tina Ruchandani

struct timeval uses a 32-bit seconds representation which will overflow in the year 2038 and beyond. This patch replaces the usage of struct timeval with ktime_t which is a 64-bit timestamp and is year 2038 safe. This patch is part of a larger attempt to remove all instances of 32-bit timekeeping variables (timeval, timespec, time_t) which are not year 2038 safe, from the kernel. Signed-off-by: Tina Ruchandani <ruchandani.tina(a)gmail.com> Suggested-by: Arnd Bergmann <arndb(a)arndb.de> -- Changes in v3: - Clean up commit message. - Use ktime_us_delta which is more concise than the combination of ktime_sub and ktime_to_us Changes in v2: - Use the more concise ktime_us_delta - Preserve the waketime argument in dvb_frontend_sleep_until as a pointer, fixes bug introduced in v1 of the patch where the caller doesn't get its timestamp modified. Signed-off-by: Tina Ruchandani <ruchandani.tina(a)gmail.com> --- drivers/media/dvb-core/dvb_frontend.c | 41 ++++++++++------------------------- drivers/media/dvb-core/dvb_frontend.h | 3 +-- drivers/media/dvb-frontends/stv0299.c | 12 +++++----- 3 files changed, 19 insertions(+), 37 deletions(-) diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c index 882ca41..69be73c 100644 --- a/drivers/media/dvb-core/dvb_frontend.c +++ b/drivers/media/dvb-core/dvb_frontend.c @@ -40,6 +40,7 @@ #include <linux/freezer.h> #include <linux/jiffies.h> #include <linux/kthread.h> +#include <linux/ktime.h> #include <asm/processor.h> #include "dvb_frontend.h" @@ -889,42 +890,21 @@ static void dvb_frontend_stop(struct dvb_frontend *fe) fepriv->thread); } -s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime) -{ - return ((curtime.tv_usec < lasttime.tv_usec) ? - 1000000 - lasttime.tv_usec + curtime.tv_usec : - curtime.tv_usec - lasttime.tv_usec); -} -EXPORT_SYMBOL(timeval_usec_diff); - -static inline void timeval_usec_add(struct timeval *curtime, u32 add_usec) -{ - curtime->tv_usec += add_usec; - if (curtime->tv_usec >= 1000000) { - curtime->tv_usec -= 1000000; - curtime->tv_sec++; - } -} - /* * Sleep until gettimeofday() > waketime + add_usec * This needs to be as precise as possible, but as the delay is * usually between 2ms and 32ms, it is done using a scheduled msleep * followed by usleep (normally a busy-wait loop) for the remainder */ -void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec) +void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec) { - struct timeval lasttime; s32 delta, newdelta; - timeval_usec_add(waketime, add_usec); - - do_gettimeofday(&lasttime); - delta = timeval_usec_diff(lasttime, *waketime); + ktime_add_us(*waketime, add_usec); + delta = ktime_us_delta(ktime_get_real(), *waketime); if (delta > 2500) { msleep((delta - 1500) / 1000); - do_gettimeofday(&lasttime); - newdelta = timeval_usec_diff(lasttime, *waketime); + newdelta = ktime_us_delta(ktime_get_real(), *waketime); delta = (newdelta > delta) ? 0 : newdelta; } if (delta > 0) @@ -2458,13 +2438,13 @@ static int dvb_frontend_ioctl_legacy(struct file *file, * include the initialization or start bit */ unsigned long swcmd = ((unsigned long) parg) << 1; - struct timeval nexttime; - struct timeval tv[10]; + ktime_t nexttime; + ktime_t tv[10]; int i; u8 last = 1; if (dvb_frontend_debug) printk("%s switch command: 0x%04lx\n", __func__, swcmd); - do_gettimeofday(&nexttime); + nexttime = ktime_get_real(); if (dvb_frontend_debug) tv[0] = nexttime; /* before sending a command, initialize by sending @@ -2475,7 +2455,7 @@ static int dvb_frontend_ioctl_legacy(struct file *file, for (i = 0; i < 9; i++) { if (dvb_frontend_debug) - do_gettimeofday(&tv[i + 1]); + tv[i+1] = ktime_get_real(); if ((swcmd & 0x01) != last) { /* set voltage to (last ? 13V : 18V) */ fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18); @@ -2489,7 +2469,8 @@ static int dvb_frontend_ioctl_legacy(struct file *file, printk("%s(%d): switch delay (should be 32k followed by all 8k\n", __func__, fe->dvb->num); for (i = 1; i < 10; i++) - printk("%d: %d\n", i, timeval_usec_diff(tv[i-1] , tv[i])); + printk("%d: %d\n", i, + (int) ktime_us_delta(tv[i], tv[i-1]); } err = 0; fepriv->state = FESTATE_DISEQC; diff --git a/drivers/media/dvb-core/dvb_frontend.h b/drivers/media/dvb-core/dvb_frontend.h index 816269e..5b64686 100644 --- a/drivers/media/dvb-core/dvb_frontend.h +++ b/drivers/media/dvb-core/dvb_frontend.h @@ -439,7 +439,6 @@ extern void dvb_frontend_reinitialise(struct dvb_frontend *fe); extern int dvb_frontend_suspend(struct dvb_frontend *fe); extern int dvb_frontend_resume(struct dvb_frontend *fe); -extern void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec); -extern s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime); +extern void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec); #endif diff --git a/drivers/media/dvb-frontends/stv0299.c b/drivers/media/dvb-frontends/stv0299.c index b57ecf4..347c2bc 100644 --- a/drivers/media/dvb-frontends/stv0299.c +++ b/drivers/media/dvb-frontends/stv0299.c @@ -44,6 +44,7 @@ #include <linux/init.h> #include <linux/kernel.h> +#include <linux/ktime.h> #include <linux/module.h> #include <linux/string.h> #include <linux/slab.h> @@ -404,8 +405,8 @@ static int stv0299_send_legacy_dish_cmd (struct dvb_frontend* fe, unsigned long u8 lv_mask = 0x40; u8 last = 1; int i; - struct timeval nexttime; - struct timeval tv[10]; + ktime_t nexttime; + ktime_t tv[10]; reg0x08 = stv0299_readreg (state, 0x08); reg0x0c = stv0299_readreg (state, 0x0c); @@ -418,7 +419,7 @@ static int stv0299_send_legacy_dish_cmd (struct dvb_frontend* fe, unsigned long if (debug_legacy_dish_switch) printk ("%s switch command: 0x%04lx\n",__func__, cmd); - do_gettimeofday (&nexttime); + nexttime = ktime_get_real(); if (debug_legacy_dish_switch) tv[0] = nexttime; stv0299_writeregI (state, 0x0c, reg0x0c | 0x50); /* set LNB to 18V */ @@ -427,7 +428,7 @@ static int stv0299_send_legacy_dish_cmd (struct dvb_frontend* fe, unsigned long for (i=0; i<9; i++) { if (debug_legacy_dish_switch) - do_gettimeofday (&tv[i+1]); + tv[i+1] = ktime_get_real(); if((cmd & 0x01) != last) { /* set voltage to (last ? 13V : 18V) */ stv0299_writeregI (state, 0x0c, reg0x0c | (last ? lv_mask : 0x50)); @@ -443,7 +444,8 @@ static int stv0299_send_legacy_dish_cmd (struct dvb_frontend* fe, unsigned long printk ("%s(%d): switch delay (should be 32k followed by all 8k\n", __func__, fe->dvb->num); for (i = 1; i < 10; i++) - printk ("%d: %d\n", i, timeval_usec_diff(tv[i-1] , tv[i])); + printk("%d: %d\n", i, + (int) ktime_us_delta(tv[i], tv[i-1])); } return 0; -- 2.2.0.rc0.207.ga3a616c

9 years, 5 months

[PATCH v4] isdn: Use ktime_t instead of 'struct timeval'

by Tina Ruchandani

'struct timeval' uses 32-bit representation for seconds which will overflow in year 2038 and beyond. mISDN/clock.c needs to compute and store elapsed time in intervals of 125 microseconds. This patch replaces the usage of 'struct timeval' with 64-bit ktime_t which is y2038 safe. The patch also replaces do_gettimeofday (wall-clock time) with ktime_get (monotonic time) since we only care about elapsed time here. Signed-off-by: Tina Ruchandani <ruchandani.tina(a)gmail.com> Suggested-by: Arnd Bergmnann <arnd(a)arndb.de> -- Changes in v4: - Fix compile error (NS_PER_SEC -> NSEC_PER_SEC) Changes in v3: - Use division scheme suggested by Arnd Bergmann to avoid a (64-bit variable) / (32-bit variable) expression. Changes in v2: - Avoid possible truncation bug caused by assigning ktime_us_delta output to a 16-bit number. - Use ktime_us_delta, more concise than a combination of ktime_sub and ktime_to_us. --- drivers/isdn/mISDN/clock.c | 56 ++++++++++++++++++---------------------------- include/linux/mISDNif.h | 2 +- 2 files changed, 23 insertions(+), 35 deletions(-) diff --git a/drivers/isdn/mISDN/clock.c b/drivers/isdn/mISDN/clock.c index 693fb7c..409c508 100644 --- a/drivers/isdn/mISDN/clock.c +++ b/drivers/isdn/mISDN/clock.c @@ -37,6 +37,7 @@ #include <linux/types.h> #include <linux/stddef.h> #include <linux/spinlock.h> +#include <linux/ktime.h> #include <linux/mISDNif.h> #include <linux/export.h> #include "core.h" @@ -45,7 +46,7 @@ static u_int *debug; static LIST_HEAD(iclock_list); static DEFINE_RWLOCK(iclock_lock); static u16 iclock_count; /* counter of last clock */ -static struct timeval iclock_tv; /* time stamp of last clock */ +static ktime_t iclock_tv; /* time stamp of last clock */ static int iclock_tv_valid; /* already received one timestamp */ static struct mISDNclock *iclock_current; @@ -53,7 +54,7 @@ void mISDN_init_clock(u_int *dp) { debug = dp; - do_gettimeofday(&iclock_tv); + iclock_tv = ktime_get(); } static void @@ -139,12 +140,11 @@ mISDN_unregister_clock(struct mISDNclock *iclock) EXPORT_SYMBOL(mISDN_unregister_clock); void -mISDN_clock_update(struct mISDNclock *iclock, int samples, struct timeval *tv) +mISDN_clock_update(struct mISDNclock *iclock, int samples, ktime_t *tv) { u_long flags; - struct timeval tv_now; - time_t elapsed_sec; - int elapsed_8000th; + ktime_t tv_now; + u16 delta; write_lock_irqsave(&iclock_lock, flags); if (iclock_current != iclock) { @@ -160,28 +160,22 @@ mISDN_clock_update(struct mISDNclock *iclock, int samples, struct timeval *tv) /* increment sample counter by given samples */ iclock_count += samples; if (tv) { /* tv must be set, if function call is delayed */ - iclock_tv.tv_sec = tv->tv_sec; - iclock_tv.tv_usec = tv->tv_usec; - } else - do_gettimeofday(&iclock_tv); + iclock_tv = *tv; + } else { + iclock_tv = ktime_get(); + } } else { /* calc elapsed time by system clock */ if (tv) { /* tv must be set, if function call is delayed */ - tv_now.tv_sec = tv->tv_sec; - tv_now.tv_usec = tv->tv_usec; - } else - do_gettimeofday(&tv_now); - elapsed_sec = tv_now.tv_sec - iclock_tv.tv_sec; - elapsed_8000th = (tv_now.tv_usec / 125) - - (iclock_tv.tv_usec / 125); - if (elapsed_8000th < 0) { - elapsed_sec -= 1; - elapsed_8000th += 8000; + tv_now = *tv; + } else { + tv_now = ktime_get(); } + delta = ktime_divns(ktime_sub(tv_now, iclock_tv), + (NSEC_PER_SEC / 8000)); /* add elapsed time to counter and set new timestamp */ - iclock_count += elapsed_sec * 8000 + elapsed_8000th; - iclock_tv.tv_sec = tv_now.tv_sec; - iclock_tv.tv_usec = tv_now.tv_usec; + iclock_count += delta; + iclock_tv = tv_now; iclock_tv_valid = 1; if (*debug & DEBUG_CLOCK) printk("Received first clock from source '%s'.\n", @@ -195,22 +189,16 @@ unsigned short mISDN_clock_get(void) { u_long flags; - struct timeval tv_now; - time_t elapsed_sec; - int elapsed_8000th; + ktime_t tv_now; + u16 delta; u16 count; read_lock_irqsave(&iclock_lock, flags); /* calc elapsed time by system clock */ - do_gettimeofday(&tv_now); - elapsed_sec = tv_now.tv_sec - iclock_tv.tv_sec; - elapsed_8000th = (tv_now.tv_usec / 125) - (iclock_tv.tv_usec / 125); - if (elapsed_8000th < 0) { - elapsed_sec -= 1; - elapsed_8000th += 8000; - } + tv_now = ktime_get(); + delta = ktime_divns(ktime_sub(tv_now, iclock_tv), + (NSEC_PER_SEC / 8000)); /* add elapsed time to counter */ - count = iclock_count + elapsed_sec * 8000 + elapsed_8000th; + count = iclock_count + delta; read_unlock_irqrestore(&iclock_lock, flags); return count; } diff --git a/include/linux/mISDNif.h b/include/linux/mISDNif.h index 246a352..ac02c54 100644 --- a/include/linux/mISDNif.h +++ b/include/linux/mISDNif.h @@ -596,7 +596,7 @@ static inline struct mISDNdevice *dev_to_mISDN(struct device *dev) } extern void set_channel_address(struct mISDNchannel *, u_int, u_int); -extern void mISDN_clock_update(struct mISDNclock *, int, struct timeval *); +extern void mISDN_clock_update(struct mISDNclock *, int, ktime_t *); extern unsigned short mISDN_clock_get(void); extern const char *mISDNDevName4ch(struct mISDNchannel *); -- 2.2.0.rc0.207.ga3a616c

9 years, 5 months

[PATCH v4 00/25] Convert the posix_clock_operations and k_clock structure to ready for 2038

by Baolin Wang

This patch series changes the 32-bit time types (timespec/itimerspec) to the 64-bit types (timespec64/itimerspec64), since 32-bit time types will break in the year 2038. This patch series introduces new methods with timespec64/itimerspec64 type, and removes the old ones with timespec/itimerspec type for posix_clock_operations and k_clock structure. Baolin Wang (25): time:Introduce struct itimerspec64 timekeeping:Introduce the current_kernel_time64() hrtimer:Introduce hrtimer_get_res64() security: Introduce security_settime64() time:Introduce the do_sys_settimeofday64() posix-timers:Introduce {get,put}_timespec/{get,put}_itimerspec posix-timers: Split up timer_gettime()/timer_settime()/clock_settime()/ clock_gettime()/clock_getres(). posix-timers: Convert timer_gettime()/timer_settime()/clock_settime()/ clock_gettime()/clock_getres() to timespec64/itimerspec64. mmtimer:Convert to timespec64/itimerspec64 alarmtimer:Convert to timespec64/itimerspec64 posix-clock:Convert to timespec64/itimerspec64 time:Introduce timespec64_to_jiffies()/jiffies_to_timespec64() cputime:Introduce cputime_to_timespec64()/timespec64_to_cputime() posix-cpu-timers:Convert to timespec64/itimerspec64 k_clock:Remove timespec/itimerspec arch/powerpc/include/asm/cputime.h | 6 +- arch/s390/include/asm/cputime.h | 8 +- drivers/char/mmtimer.c | 36 +++-- drivers/ptp/ptp_clock.c | 26 +--- include/asm-generic/cputime_jiffies.h | 10 +- include/asm-generic/cputime_nsecs.h | 4 +- include/linux/cputime.h | 16 ++ include/linux/hrtimer.h | 16 +- include/linux/jiffies.h | 21 ++- include/linux/posix-clock.h | 10 +- include/linux/posix-timers.h | 18 +-- include/linux/security.h | 25 +++- include/linux/time64.h | 35 +++++ include/linux/timekeeping.h | 26 +++- kernel/time/alarmtimer.c | 43 +++--- kernel/time/hrtimer.c | 10 +- kernel/time/posix-clock.c | 20 +-- kernel/time/posix-cpu-timers.c | 84 ++++++----- kernel/time/posix-timers.c | 259 +++++++++++++++++++++------------ kernel/time/time.c | 20 +-- kernel/time/timekeeping.c | 6 +- kernel/time/timekeeping.h | 1 - security/commoncap.c | 2 +- security/security.c | 2 +- 24 files changed, 437 insertions(+), 267 deletions(-) -- 1.7.9.5

9 years, 5 months

Re: [Y2038] [PATCH v2] [media] dvb-frontend: Replace timeval with ktime_t

by Tina Ruchandani

> -- > Changes in v2: > - Use the more concise ktime_us_delta Oops, please ignore this patch and please consider the v3 sent out immediately after instead. Tina

9 years, 5 months

Re: [Y2038] [PATCH v3] isdn: Use ktime_t instead of 'struct timeval'

by Tina Ruchandani

> > This doesn't compile: > Oops, I sent an older version of the patch with a typo. I've correct this in a v4. (NS_PER_SEC -> NSEC_PER_SEC). Thanks for taking a look at this. Tina

9 years, 5 months

[PATCH v2] [media] dvb-frontend: Replace timeval with ktime_t

by Tina Ruchandani

struct timeval uses a 32-bit seconds representation which will overflow in the year 2038 and beyond. This patch replaces the usage of struct timeval with ktime_t which is a 64-bit timestamp and is year 2038 safe. This patch is part of a larger attempt to remove all instances of 32-bit timekeeping variables (timeval, timespec, time_t) which are not year 2038 safe, from the kernel. The patch is a work-in-progress - correctness of the following changes is unclear: (a) Usage of timeval_usec_diff - The function seems to subtract usec values without caring about the difference of the seconds field. There may be an implicit assumption in the original code that the time delta is always of the order of microseconds. The patch replaces the usage of timeval_usec_diff with ktime_to_us(ktime_sub()) which computes the real timestamp difference, not just the difference in the usec field. (b) printk diffing the tv[i] and tv[i-1] values. The original printk statement seems to get the order wrong. This patch preserves that order. Signed-off-by: Tina Ruchandani <ruchandani.tina(a)gmail.com> Suggested-by: Arnd Bergmann <arnd(a)arndb.de> -- Changes in v2: - Use the more concise ktime_us_delta - Preserve the waketime argument in dvb_frontend_sleep_until as a pointer, fixes bug introduced in v1 of the patch where the caller doesn't get its timestamp modified. --- drivers/media/dvb-core/dvb_frontend.c | 40 +++++++++-------------------------- drivers/media/dvb-core/dvb_frontend.h | 3 +-- drivers/media/dvb-frontends/stv0299.c | 11 +++++----- 3 files changed, 17 insertions(+), 37 deletions(-) diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c index 882ca41..c110e37 100644 --- a/drivers/media/dvb-core/dvb_frontend.c +++ b/drivers/media/dvb-core/dvb_frontend.c @@ -40,6 +40,7 @@ #include <linux/freezer.h> #include <linux/jiffies.h> #include <linux/kthread.h> +#include <linux/ktime.h> #include <asm/processor.h> #include "dvb_frontend.h" @@ -889,42 +890,21 @@ static void dvb_frontend_stop(struct dvb_frontend *fe) fepriv->thread); } -s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime) -{ - return ((curtime.tv_usec < lasttime.tv_usec) ? - 1000000 - lasttime.tv_usec + curtime.tv_usec : - curtime.tv_usec - lasttime.tv_usec); -} -EXPORT_SYMBOL(timeval_usec_diff); - -static inline void timeval_usec_add(struct timeval *curtime, u32 add_usec) -{ - curtime->tv_usec += add_usec; - if (curtime->tv_usec >= 1000000) { - curtime->tv_usec -= 1000000; - curtime->tv_sec++; - } -} - /* * Sleep until gettimeofday() > waketime + add_usec * This needs to be as precise as possible, but as the delay is * usually between 2ms and 32ms, it is done using a scheduled msleep * followed by usleep (normally a busy-wait loop) for the remainder */ -void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec) +void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec) { - struct timeval lasttime; s32 delta, newdelta; - timeval_usec_add(waketime, add_usec); - - do_gettimeofday(&lasttime); - delta = timeval_usec_diff(lasttime, *waketime); + ktime_add_us(*waketime, add_usec); + delta = ktime_us_delta(ktime_get_real(), *waketime); if (delta > 2500) { msleep((delta - 1500) / 1000); - do_gettimeofday(&lasttime); - newdelta = timeval_usec_diff(lasttime, *waketime); + newdelta = ktime_us_delta(ktime_get_real(), *waketime); delta = (newdelta > delta) ? 0 : newdelta; } if (delta > 0) @@ -2458,13 +2438,13 @@ static int dvb_frontend_ioctl_legacy(struct file *file, * include the initialization or start bit */ unsigned long swcmd = ((unsigned long) parg) << 1; - struct timeval nexttime; - struct timeval tv[10]; + ktime_t nexttime; + ktime_t tv[10]; int i; u8 last = 1; if (dvb_frontend_debug) printk("%s switch command: 0x%04lx\n", __func__, swcmd); - do_gettimeofday(&nexttime); + nexttime = ktime_get_real(); if (dvb_frontend_debug) tv[0] = nexttime; /* before sending a command, initialize by sending @@ -2475,7 +2455,7 @@ static int dvb_frontend_ioctl_legacy(struct file *file, for (i = 0; i < 9; i++) { if (dvb_frontend_debug) - do_gettimeofday(&tv[i + 1]); + tv[i+1] = ktime_get_real(); if ((swcmd & 0x01) != last) { /* set voltage to (last ? 13V : 18V) */ fe->ops.set_voltage(fe, (last) ? SEC_VOLTAGE_13 : SEC_VOLTAGE_18); @@ -2489,7 +2469,7 @@ static int dvb_frontend_ioctl_legacy(struct file *file, printk("%s(%d): switch delay (should be 32k followed by all 8k\n", __func__, fe->dvb->num); for (i = 1; i < 10; i++) - printk("%d: %d\n", i, timeval_usec_diff(tv[i-1] , tv[i])); + printk("%d: %d\n", i, (int) ktime_to_us(ktime_sub(tv[i-1], tv[i]))); } err = 0; fepriv->state = FESTATE_DISEQC; diff --git a/drivers/media/dvb-core/dvb_frontend.h b/drivers/media/dvb-core/dvb_frontend.h index 816269e..5b64686 100644 --- a/drivers/media/dvb-core/dvb_frontend.h +++ b/drivers/media/dvb-core/dvb_frontend.h @@ -439,7 +439,6 @@ extern void dvb_frontend_reinitialise(struct dvb_frontend *fe); extern int dvb_frontend_suspend(struct dvb_frontend *fe); extern int dvb_frontend_resume(struct dvb_frontend *fe); -extern void dvb_frontend_sleep_until(struct timeval *waketime, u32 add_usec); -extern s32 timeval_usec_diff(struct timeval lasttime, struct timeval curtime); +extern void dvb_frontend_sleep_until(ktime_t *waketime, u32 add_usec); #endif diff --git a/drivers/media/dvb-frontends/stv0299.c b/drivers/media/dvb-frontends/stv0299.c index b57ecf4..70c8065 100644 --- a/drivers/media/dvb-frontends/stv0299.c +++ b/drivers/media/dvb-frontends/stv0299.c @@ -44,6 +44,7 @@ #include <linux/init.h> #include <linux/kernel.h> +#include <linux/ktime.h> #include <linux/module.h> #include <linux/string.h> #include <linux/slab.h> @@ -404,8 +405,8 @@ static int stv0299_send_legacy_dish_cmd (struct dvb_frontend* fe, unsigned long u8 lv_mask = 0x40; u8 last = 1; int i; - struct timeval nexttime; - struct timeval tv[10]; + ktime_t nexttime; + ktime_t tv[10]; reg0x08 = stv0299_readreg (state, 0x08); reg0x0c = stv0299_readreg (state, 0x0c); @@ -418,7 +419,7 @@ static int stv0299_send_legacy_dish_cmd (struct dvb_frontend* fe, unsigned long if (debug_legacy_dish_switch) printk ("%s switch command: 0x%04lx\n",__func__, cmd); - do_gettimeofday (&nexttime); + nexttime = ktime_get_real(); if (debug_legacy_dish_switch) tv[0] = nexttime; stv0299_writeregI (state, 0x0c, reg0x0c | 0x50); /* set LNB to 18V */ @@ -427,7 +428,7 @@ static int stv0299_send_legacy_dish_cmd (struct dvb_frontend* fe, unsigned long for (i=0; i<9; i++) { if (debug_legacy_dish_switch) - do_gettimeofday (&tv[i+1]); + tv[i+1] = ktime_get_real(); if((cmd & 0x01) != last) { /* set voltage to (last ? 13V : 18V) */ stv0299_writeregI (state, 0x0c, reg0x0c | (last ? lv_mask : 0x50)); @@ -443,7 +444,7 @@ static int stv0299_send_legacy_dish_cmd (struct dvb_frontend* fe, unsigned long printk ("%s(%d): switch delay (should be 32k followed by all 8k\n", __func__, fe->dvb->num); for (i = 1; i < 10; i++) - printk ("%d: %d\n", i, timeval_usec_diff(tv[i-1] , tv[i])); + printk("%d: %d\n", i, (int) ktime_to_us(ktime_sub(tv[i-1], tv[i]))); } return 0; -- 2.2.0.rc0.207.ga3a616c

9 years, 5 months

[PATCH v4 10/25] posix-timers:Convert to the 64bit methods for the timer_settime syscall function

by Baolin Wang

This patch introduces the timer_set64 method with itimerspec64 type for k_clock structure, that makes it ready for the 2038 year. Convert to the 64bit method with itimerspec64 type for the timer_settime syscall function, and change the timer_settime syscall implementation. Also add a default 64bit method for the timer_set64 pointer of k_clock structure, and it will be removed after all the drivers are converted to 64bit methods. Signed-off-by: Baolin Wang <baolin.wang(a)linaro.org> --- include/linux/posix-timers.h | 3 +++ kernel/time/posix-timers.c | 39 +++++++++++++++++++++++++++++---------- 2 files changed, 32 insertions(+), 10 deletions(-) diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h index e84436b..16c3364 100644 --- a/include/linux/posix-timers.h +++ b/include/linux/posix-timers.h @@ -109,6 +109,9 @@ struct k_clock { int (*timer_set) (struct k_itimer * timr, int flags, struct itimerspec * new_setting, struct itimerspec * old_setting); + int (*timer_set64) (struct k_itimer *timr, int flags, + struct itimerspec64 *new_setting, + struct itimerspec64 *old_setting); int (*timer_del) (struct k_itimer * timr); #define TIMER_RETRY 1 void (*timer_get) (struct k_itimer * timr, diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c index 99ccb3c..c034a53 100644 --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -553,6 +553,23 @@ static void default_timer_get64(struct k_itimer *timr, *cur_setting64 = itimerspec_to_itimerspec64(&cur_setting); } +static int default_timer_set64(struct k_itimer *timr, int flags, + struct itimerspec64 *new_setting64, + struct itimerspec64 *old_setting64) +{ + struct k_clock *kc = clockid_to_kclock(timr->it_clock); + struct itimerspec new_setting, old_setting; + struct itimerspec *rtn = old_setting64 ? &old_setting : NULL; + int ret; + + new_setting = itimerspec64_to_itimerspec(new_setting64); + ret = kc->timer_set(timr, flags, &new_setting, rtn); + if (!ret && old_setting64) + *old_setting64 = itimerspec_to_itimerspec64(&old_setting); + + return ret; +} + void posix_timers_register_clock(const clockid_t clock_id, struct k_clock *new_clock) { @@ -575,6 +592,8 @@ void posix_timers_register_clock(const clockid_t clock_id, if (new_clock->timer_get && !new_clock->timer_get64) new_clock->timer_get64 = default_timer_get64; + if (new_clock->timer_set && !new_clock->timer_set64) + new_clock->timer_set64 = default_timer_set64; posix_clocks[clock_id] = *new_clock; } @@ -920,16 +939,16 @@ common_timer_set(struct k_itimer *timr, int flags, return 0; } -static int __timer_settime(timer_t timer_id, int flags, struct itimerspec *new_spec, - struct itimerspec *old_spec) +static int __timer_settime(timer_t timer_id, int flags, struct itimerspec64 *new_spec, + struct itimerspec64 *old_spec) { struct k_itimer *timr; int error = 0; unsigned long flag; struct k_clock *kc; - if (!timespec_valid(&new_spec->it_interval) || - !timespec_valid(&new_spec->it_value)) + if (!timespec64_valid(&new_spec->it_interval) || + !timespec64_valid(&new_spec->it_value)) return -EINVAL; retry: @@ -938,10 +957,10 @@ retry: return -EINVAL; kc = clockid_to_kclock(timr->it_clock); - if (WARN_ON_ONCE(!kc || !kc->timer_set)) + if (WARN_ON_ONCE(!kc || !kc->timer_set64)) error = -EINVAL; else - error = kc->timer_set(timr, flags, new_spec, old_spec); + error = kc->timer_set64(timr, flags, new_spec, old_spec); unlock_timer(timr, flag); if (error == TIMER_RETRY) { @@ -957,20 +976,20 @@ SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, const struct itimerspec __user *, new_setting, struct itimerspec __user *, old_setting) { - struct itimerspec new_spec, old_spec; + struct itimerspec64 new_spec, old_spec; int error = 0; - struct itimerspec *rtn = old_setting ? &old_spec : NULL; + struct itimerspec64 *rtn = old_setting ? &old_spec : NULL; if (!new_setting) return -EINVAL; - if (copy_from_user(&new_spec, new_setting, sizeof (new_spec))) + if (get_itimerspec(&new_spec, new_setting)) return -EFAULT; error = __timer_settime(timer_id, flags, &new_spec, rtn); if (old_setting && !error && - copy_to_user(old_setting, &old_spec, sizeof (old_spec))) + put_itimerspec(&old_spec, old_setting)) error = -EFAULT; return error; -- 1.7.9.5

9 years, 5 months

[PATCH v4 09/25] posix-timers:Change the implementation for timer_settime syscall

by Baolin Wang

This patch splits out the guts of the timer_settime syscall and changes the timer_settime syscall implementation to prepare the converting to 64bit methods for the timer_settime syscall function in posix-timers.c file. Signed-off-by: Baolin Wang <baolin.wang(a)linaro.org> --- kernel/time/posix-timers.c | 41 ++++++++++++++++++++++++++--------------- 1 file changed, 26 insertions(+), 15 deletions(-) diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c index 2adeb29..99ccb3c 100644 --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -920,27 +920,18 @@ common_timer_set(struct k_itimer *timr, int flags, return 0; } -/* Set a POSIX.1b interval timer */ -SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, - const struct itimerspec __user *, new_setting, - struct itimerspec __user *, old_setting) +static int __timer_settime(timer_t timer_id, int flags, struct itimerspec *new_spec, + struct itimerspec *old_spec) { struct k_itimer *timr; - struct itimerspec new_spec, old_spec; int error = 0; unsigned long flag; - struct itimerspec *rtn = old_setting ? &old_spec : NULL; struct k_clock *kc; - if (!new_setting) + if (!timespec_valid(&new_spec->it_interval) || + !timespec_valid(&new_spec->it_value)) return -EINVAL; - if (copy_from_user(&new_spec, new_setting, sizeof (new_spec))) - return -EFAULT; - - if (!timespec_valid(&new_spec.it_interval) || - !timespec_valid(&new_spec.it_value)) - return -EINVAL; retry: timr = lock_timer(timer_id, &flag); if (!timr) @@ -950,14 +941,34 @@ retry: if (WARN_ON_ONCE(!kc || !kc->timer_set)) error = -EINVAL; else - error = kc->timer_set(timr, flags, &new_spec, rtn); + error = kc->timer_set(timr, flags, new_spec, old_spec); unlock_timer(timr, flag); if (error == TIMER_RETRY) { - rtn = NULL; // We already got the old time... + old_spec = NULL; // We already got the old time... goto retry; } + return error; +} + +/* Set a POSIX.1b interval timer */ +SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, + const struct itimerspec __user *, new_setting, + struct itimerspec __user *, old_setting) +{ + struct itimerspec new_spec, old_spec; + int error = 0; + struct itimerspec *rtn = old_setting ? &old_spec : NULL; + + if (!new_setting) + return -EINVAL; + + if (copy_from_user(&new_spec, new_setting, sizeof (new_spec))) + return -EFAULT; + + error = __timer_settime(timer_id, flags, &new_spec, rtn); + if (old_setting && !error && copy_to_user(old_setting, &old_spec, sizeof (old_spec))) error = -EFAULT; -- 1.7.9.5

9 years, 5 months

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Y2038 May 2015