1. 26 Feb, 2010 8 commits
  2. 27 Jan, 2010 2 commits
  3. 13 Jan, 2010 9 commits
  4. 18 Dec, 2009 4 commits
  5. 15 Dec, 2009 1 commit
    • André Goddard Rosa's avatar
      tree-wide: convert open calls to remove spaces to skip_spaces() lib function · e7d2860b
      André Goddard Rosa authored
      Makes use of skip_spaces() defined in lib/string.c for removing leading
      spaces from strings all over the tree.
      
      It decreases lib.a code size by 47 bytes and reuses the function tree-wide:
         text    data     bss     dec     hex filename
        64688     584     592   65864   10148 (TOTALS-BEFORE)
        64641     584     592   65817   10119 (TOTALS-AFTER)
      
      Also, while at it, if we see (*str && isspace(*str)), we can be sure to
      remove the first condition (*str) as the second one (isspace(*str)) also
      evaluates to 0 whenever *str == 0, making it redundant. In other words,
      "a char equals zero is never a space".
      
      Julia Lawall tried the semantic patch (http://coccinelle.lip6.fr
      
      ) below,
      and found occurrences of this pattern on 3 more files:
          drivers/leds/led-class.c
          drivers/leds/ledtrig-timer.c
          drivers/video/output.c
      
      @@
      expression str;
      @@
      
      ( // ignore skip_spaces cases
      while (*str &&  isspace(*str)) { \(str++;\|++str;\) }
      |
      - *str &&
      isspace(*str)
      )
      Signed-off-by: default avatarAndré Goddard Rosa <andre.goddard@gmail.com>
      Cc: Julia Lawall <julia@diku.dk>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Richard Purdie <rpurdie@rpsys.net>
      Cc: Neil Brown <neilb@suse.de>
      Cc: Kyle McMartin <kyle@mcmartin.ca>
      Cc: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
      Cc: David Howells <dhowells@redhat.com>
      Cc: <linux-ext4@vger.kernel.org>
      Cc: Samuel Ortiz <samuel@sortiz.org>
      Cc: Patrick McHardy <kaber@trash.net>
      Cc: Takashi Iwai <tiwai@suse.de>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e7d2860b
  6. 14 Dec, 2009 1 commit
  7. 11 Dec, 2009 2 commits
  8. 07 Dec, 2009 5 commits
  9. 18 Nov, 2009 1 commit
  10. 17 Nov, 2009 1 commit
    • Lin Ming's avatar
      timekeeping: Fix clock_gettime vsyscall time warp · 0696b711
      Lin Ming authored
      Since commit 0a544198
      
       "timekeeping: Move NTP adjusted clock multiplier
      to struct timekeeper" the clock multiplier of vsyscall is updated with
      the unmodified clock multiplier of the clock source and not with the
      NTP adjusted multiplier of the timekeeper.
      
      This causes user space observerable time warps:
      new CLOCK-warp maximum: 120 nsecs,  00000025c337c537 -> 00000025c337c4bf
      
      Add a new argument "mult" to update_vsyscall() and hand in the
      timekeeping internal NTP adjusted multiplier.
      Signed-off-by: default avatarLin Ming <ming.m.lin@intel.com>
      Cc: "Zhang Yanmin" <yanmin_zhang@linux.intel.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Tony Luck <tony.luck@intel.com>
      LKML-Reference: <1258436990.17765.83.camel@minggr.sh.intel.com>
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      0696b711
  11. 13 Nov, 2009 2 commits
    • Christian Borntraeger's avatar
      [S390] s390: fix single stepping on svc0 · bcc6525f
      Christian Borntraeger authored
      
      
      On s390 there are two ways of specifying the system call number for
      the svc instruction. The standard way is to use the immediate field
      in the instruction (or to use EXecute for values unknown during
      assemble time). This can encode 256 system calls.
      The kernel ABI also allows to put the system call number in r1 and
      then execute svc 0 to enable system call numbers > 255.
      
      It turns out that single stepping svc 0 is broken, since the PER
      program check handler uses r1. We have to use a different register.
      Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
      Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      bcc6525f
    • Martin Schwidefsky's avatar
      [S390] reset cputime accounting after IPL from NSS · b89031e0
      Martin Schwidefsky authored
      
      
      After an IPL from NSS the uptime of the system is incorrect. The reason
      is that the startup code in head.S is not executed in case of an IPL
      from NSS. Due to that sched_clock_base_cc which is used to initialze
      wall_to_monotonic contains the time stamp when the NSS has been created
      instead of the time stamp of the system start.
      
      Reinitialize the cputime accounting values in create_kernel_nss after
      the SAVESYS CP command that created the NSS segment.
      Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      b89031e0
  12. 12 Nov, 2009 1 commit
  13. 06 Nov, 2009 1 commit
  14. 05 Nov, 2009 1 commit
    • Martin Schwidefsky's avatar
      nohz: Introduce arch_needs_cpu · 3c5d92a0
      Martin Schwidefsky authored
      
      
      Allow the architecture to request a normal jiffy tick when the system
      goes idle and tick_nohz_stop_sched_tick is called . On s390 the hook is
      used to prevent the system going fully idle if there has been an
      interrupt other than a clock comparator interrupt since the last wakeup.
      
      On s390 the HiperSockets response time for 1 connection ping-pong goes
      down from 42 to 34 microseconds. The CPU cost decreases by 27%.
      Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      LKML-Reference: <20090929122533.402715150@de.ibm.com>
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      3c5d92a0
  15. 29 Oct, 2009 1 commit
    • Heiko Carstens's avatar
      [S390] smp: fix sigp sense handling · b3dcf3de
      Heiko Carstens authored
      
      
      sigp sense only returns the status of a cpu if it is non zero. If the
      status of the sensed cpu is all zeros condition code 0 (accpeted) is
      set and no status bits are returned.
      The current code however assumes that a status was returned and tests
      bits in it. This means uninitalized data is accessed with random
      results.
      Worst case is that the code that checks if cpu is offline on cpu
      hotplug assumes that the target cpu is offline while it is still
      running. This leads potentially to memory corruption since resources
      that are still needed by the target cpu will be freed and could be
      resused while still in use.
      Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
      Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      b3dcf3de