linux-toradex.git/kernel/posix-timers.c, branch v2.6.34

posix-timers.c: Don't export local functions

2010-02-05T13:54:10+00:00

Signed-off-by: H Hartley Sweeten 
Signed-off-by: Andrew Morton 
Signed-off-by: Thomas Gleixner

time: Introduce CLOCK_REALTIME_COARSE

2009-08-21T19:43:46+00:00

After talking with some application writers who want very fast, but not
fine-grained timestamps, I decided to try to implement new clock_ids
to clock_gettime(): CLOCK_REALTIME_COARSE and CLOCK_MONOTONIC_COARSE
which returns the time at the last tick. This is very fast as we don't
have to access any hardware (which can be very painful if you're using
something like the acpi_pm clocksource), and we can even use the vdso
clock_gettime() method to avoid the syscall. The only trade off is you
only get low-res tick grained time resolution.

This isn't a new idea, I know Ingo has a patch in the -rt tree that made
the vsyscall gettimeofday() return coarse grained time when the
vsyscall64 sysctrl was set to 2. However this affects all applications
on a system.

With this method, applications can choose the proper speed/granularity
trade-off for themselves.

Signed-off-by: John Stultz 
Cc: Andi Kleen 
Cc: nikolag@ca.ibm.com
Cc: Darren Hart 
Cc: arjan@infradead.org
Cc: jonathan@jonmasters.org
LKML-Reference: <1250734414.6897.5.camel@localhost.localdomain>
Signed-off-by: Thomas Gleixner

posix-timers: Fix oops in clock_nanosleep() with CLOCK_MONOTONIC_RAW

2009-08-04T08:16:41+00:00

Prevent calling do_nanosleep() with clockid
CLOCK_MONOTONIC_RAW, it may cause oops, such as NULL pointer
dereference.

Signed-off-by: Hiroshi Shimamoto 
Cc: Andrew Morton 
Cc: Thomas Gleixner 
Cc: John Stultz 
Cc: 
LKML-Reference: <4A764FF3.50607@ct.jp.nec.com>
Signed-off-by: Ingo Molnar

[CVE-2009-0029] System call wrappers part 05

2009-01-14T13:15:20+00:00

Signed-off-by: Heiko Carstens

Merge branches 'timers/clocksource', 'timers/hpet', 'timers/hrtimers', 'timers/nohz', 'timers/ntp', 'timers/posixtimers' and 'timers/rtc' into timers/core

2008-12-25T17:02:25+00:00

Null pointer deref with hrtimer_try_to_cancel()

2008-12-20T22:13:45+00:00

Impact: Prevent kernel crash with posix timer clockid CLOCK_MONOTONIC_RAW

commit 2d42244ae71d6c7b0884b5664cf2eda30fb2ae68 (clocksource:
introduce CLOCK_MONOTONIC_RAW) introduced a new clockid, which is only
available to read out the raw not NTP adjusted system time.

The above commit did not prevent that a posix timer can be created
with that clockid. The timer_create() syscall succeeds and initializes
the timer to a non existing hrtimer base. When the timer is deleted
either by timer_delete() or by the exit() cleanup the kernel crashes.

Prevent the creation of timers for CLOCK_MONOTONIC_RAW by setting the
posix clock function to no_timer_create which returns an error code.

Reported-and-tested-by: Eric Sesterhenn 
Signed-off-by: Thomas Gleixner 
Acked-by: Oleg Nesterov 
Signed-off-by: Linus Torvalds

posix-timers: check ->it_signal instead of ->it_pid to validate the timer

2008-12-12T16:00:34+00:00

Impact: clean up, speed up

->it_pid (was ->it_process) has also a special meaning: if it is NULL,
the timer is under deletion or it wasn't initialized yet. We can check
->it_signal != NULL instead, this way we can

	- simplify sys_timer_create() a bit

	- remove yet another check from lock_timer()

	- move put_pid(->it_pid) into release_posix_timer() which
	  runs outside of ->it_lock

Signed-off-by: Oleg Nesterov 
Signed-off-by: Andrew Morton 
Signed-off-by: Thomas Gleixner

posix-timers: use "struct pid" instead of "struct task_struct"

2008-12-12T16:00:07+00:00

Impact: restructure, clean up code

k_itimer holds the ref to the ->it_process until sys_timer_delete(). This
allows to pin up to RLIMIT_SIGPENDING dead task_struct's. Change the code
to use "struct pid *" instead.

The patch doesn't kill ->it_process, it places ->it_pid into the union.
->it_process is still used by do_cpu_nanosleep() as before. It would be
trivial to change the nanosleep code as well, but since it uses it_process
in a special way I think it is better to keep this field for grep.

The patch bloats the kernel by 104 bytes and it also adds the new pointer,
->it_signal, to k_itimer. It is used by lock_timer() to verify that the
found timer was not created by another process. It is not clear why do we
use the global database (and thus the global idr_lock) for posix timers.
We still need the signal_struct->posix_timers which contains all useable
timers, perhaps it is better to use some form of per-process array
instead.

Signed-off-by: Oleg Nesterov 
Signed-off-by: Andrew Morton 
Signed-off-by: Thomas Gleixner

Merge branch 'timers/range-hrtimers' into v28-range-hrtimers-for-linus-v2

2008-10-22T07:48:06+00:00

Conflicts:

	kernel/time/tick-sched.c

Signed-off-by: Thomas Gleixner

Merge branches 'timers/clocksource', 'timers/hrtimers', 'timers/nohz', 'timers/ntp', 'timers/posixtimers' and 'timers/debug' into v28-timers-for-linus

2008-10-20T11:14:06+00:00