01 Nov, 2011

1 commit

• 6e5fdeedc   kernel: Fix files explicitly needing EXPORT_SYMBOL infrastructure ... Browse Code »

  These files were getting via an implicit non-obvious
  path, but we want to crush those out of existence since they cost
  time during compiles of processing thousands of lines of headers
  for no reason. Give them the lightweight header that just contains
  the EXPORT_SYMBOL infrastructure.

  Signed-off-by: Paul Gortmaker

  Paul Gortmaker

  2011-11-01 07:30:05 +0800  

18 Apr, 2011

1 commit

• 1791f8814   posix clocks: Replace mutex with reader/writer semaphore ... Browse Code »

  A dynamic posix clock is protected from asynchronous removal by a mutex.
  However, using a mutex has the unwanted effect that a long running clock
  operation in one process will unnecessarily block other processes.

  For example, one process might call read() to get an external time stamp
  coming in at one pulse per second. A second process calling clock_gettime
  would have to wait for almost a whole second.

  This patch fixes the issue by using a reader/writer semaphore instead of
  a mutex.

  Signed-off-by: Richard Cochran
  Cc: John Stultz
  Link: http://lkml.kernel.org/r/%3C20110330132421.GA31771%40riccoc20.at.omicron.at%3E
  Signed-off-by: Thomas Gleixner

  Richard Cochran

  2011-04-18 16:39:38 +0800  

13 Mar, 2011

1 commit

• 6e6823d17   posix-clocks: Check write permissions in posix syscalls ... Browse Code »

  pc_clock_settime() and pc_clock_adjtime() do not check whether the fd
  was opened in write mode, so a clock can be set with a read only fd.

  [ tglx: We deliberately do not return -EPERM as we want this to be
  distingushable from the capability based permission check ]

  Signed-off-by: Torben Hohn
  LKML-Reference:
  Cc: Richard Cochran
  Cc: John Stultz
  Cc: Thomas Gleixner

  Torben Hohn

  2011-03-13 04:27:07 +0800  

02 Feb, 2011

1 commit

• 0606f422b   posix clocks: Introduce dynamic clocks ... Browse Code »

  This patch adds support for adding and removing posix clocks. The
  clock lifetime cycle is patterned after usb devices. Each clock is
  represented by a standard character device. In addition, the driver
  may optionally implement custom character device operations.

  The posix clock and timer system calls listed below now work with
  dynamic posix clocks, as well as the traditional static clocks.
  The following system calls are affected:

  - clock_adjtime (brand new syscall)
  - clock_gettime
  - clock_getres
  - clock_settime
  - timer_create
  - timer_delete
  - timer_gettime
  - timer_settime

  [ tglx: Adapted to the posix-timer cleanup. Moved clock_posix_dynamic
  to posix-clock.c and made all referenced functions static ]

  Signed-off-by: Richard Cochran
  Acked-by: John Stultz
  LKML-Reference:
  Signed-off-by: Thomas Gleixner

  Richard Cochran

  2011-02-02 22:28:20 +0800