From 98d6f4dd84a134d942827584a3c5f67ffd8ec35f Mon Sep 17 00:00:00 2001 From: KOSAKI Motohiro Date: Mon, 14 Oct 2013 17:33:16 -0400 Subject: [PATCH 1/3] alarmtimer: return EINVAL instead of ENOTSUPP if rtcdev doesn't exist Fedora Ruby maintainer reported latest Ruby doesn't work on Fedora Rawhide on ARM. (http://bugs.ruby-lang.org/issues/9008) Because of, commit 1c6b39ad3f (alarmtimers: Return -ENOTSUPP if no RTC device is present) intruduced to return ENOTSUPP when clock_get{time,res} can't find a RTC device. However this is incorrect. First, ENOTSUPP isn't exported to userland (ENOTSUP or EOPNOTSUP are the closest userland equivlents). Second, Posix and Linux man pages agree that clock_gettime and clock_getres should return EINVAL if clk_id argument is invalid. While the arugment that the clockid is valid, but just not supported on this hardware could be made, this is just a technicality that doesn't help userspace applicaitons, and only complicates error handling. Thus, this patch changes the code to use EINVAL. Cc: Thomas Gleixner Cc: Frederic Weisbecker Cc: stable #3.0 and up Reported-by: Vit Ondruch Signed-off-by: KOSAKI Motohiro [jstultz: Tweaks to commit message to include full rational] Signed-off-by: John Stultz --- kernel/time/alarmtimer.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c index eec50fcef9e4..88c9c65a430d 100644 --- a/kernel/time/alarmtimer.c +++ b/kernel/time/alarmtimer.c @@ -490,7 +490,7 @@ static int alarm_clock_getres(const clockid_t which_clock, struct timespec *tp) clockid_t baseid = alarm_bases[clock2alarm(which_clock)].base_clockid; if (!alarmtimer_get_rtcdev()) - return -ENOTSUPP; + return -EINVAL; return hrtimer_get_res(baseid, tp); } @@ -507,7 +507,7 @@ static int alarm_clock_get(clockid_t which_clock, struct timespec *tp) struct alarm_base *base = &alarm_bases[clock2alarm(which_clock)]; if (!alarmtimer_get_rtcdev()) - return -ENOTSUPP; + return -EINVAL; *tp = ktime_to_timespec(base->gettime()); return 0; From b7bc50e45111e59419474154736f419a555158d9 Mon Sep 17 00:00:00 2001 From: Xie XiuQi Date: Fri, 18 Oct 2013 09:13:30 +0800 Subject: [PATCH 2/3] timekeeping: Fix some trivial typos in comments Fix some typos in timekeeping comments. Signed-off-by: Xie XiuQi [jstultz: Commit message tweaks] Signed-off-by: John Stultz --- kernel/time/timekeeping.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index 947ba25a95a0..3abf53418b67 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -1613,9 +1613,10 @@ void get_xtime_and_monotonic_and_sleep_offset(struct timespec *xtim, * ktime_get_update_offsets - hrtimer helper * @offs_real: pointer to storage for monotonic -> realtime offset * @offs_boot: pointer to storage for monotonic -> boottime offset + * @offs_tai: pointer to storage for monotonic -> clock tai offset * * Returns current monotonic time and updates the offsets - * Called from hrtimer_interupt() or retrigger_next_event() + * Called from hrtimer_interrupt() or retrigger_next_event() */ ktime_t ktime_get_update_offsets(ktime_t *offs_real, ktime_t *offs_boot, ktime_t *offs_tai) From 891292a767c2453af0e5be9465e95b06b4b29ebe Mon Sep 17 00:00:00 2001 From: Patrick Palka Date: Fri, 11 Oct 2013 13:11:55 -0400 Subject: [PATCH 3/3] time: Fix signedness bug in sysfs_get_uname() and its callers sysfs_get_uname() is erroneously declared as returning size_t even though it may return a negative value, specifically -EINVAL. Its callers then check whether its return value is less than zero and indeed that is never the case for size_t. This patch changes sysfs_get_uname() to return ssize_t and makes sure its callers use ssize_t accordingly. Signed-off-by: Patrick Palka [jstultz: Didn't apply cleanly, as a similar partial fix was also applied so had to resolve the collisions] Signed-off-by: John Stultz --- kernel/time/clockevents.c | 2 +- kernel/time/clocksource.c | 2 +- kernel/time/tick-internal.h | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c index 38959c866789..30554b9fb1f7 100644 --- a/kernel/time/clockevents.c +++ b/kernel/time/clockevents.c @@ -584,7 +584,7 @@ static ssize_t sysfs_unbind_tick_dev(struct device *dev, const char *buf, size_t count) { char name[CS_NAME_LEN]; - size_t ret = sysfs_get_uname(buf, name, count); + ssize_t ret = sysfs_get_uname(buf, name, count); struct clock_event_device *ce; if (ret < 0) diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c index c9317e14aae6..ba3e502c955a 100644 --- a/kernel/time/clocksource.c +++ b/kernel/time/clocksource.c @@ -909,7 +909,7 @@ sysfs_show_current_clocksources(struct device *dev, return count; } -size_t sysfs_get_uname(const char *buf, char *dst, size_t cnt) +ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt) { size_t ret = cnt; diff --git a/kernel/time/tick-internal.h b/kernel/time/tick-internal.h index bc906cad709b..18e71f7fbc2a 100644 --- a/kernel/time/tick-internal.h +++ b/kernel/time/tick-internal.h @@ -31,7 +31,7 @@ extern void tick_install_replacement(struct clock_event_device *dev); extern void clockevents_shutdown(struct clock_event_device *dev); -extern size_t sysfs_get_uname(const char *buf, char *dst, size_t cnt); +extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt); /* * NO_HZ / high resolution timer shared code