1. 29 Oct, 2010 1 commit
    • Santosh Shilimkar's avatar
      oprofile: Fix the hang while taking the cpu offline · 4ac3dbec
      Santosh Shilimkar authored
      The kernel build with CONFIG_OPROFILE and CPU_HOTPLUG enabled.
      The oprofile is initialised using system timer in absence of hardware
      counters supports. Oprofile isn't started from userland.
      
      In this setup while doing a CPU offline the kernel hangs in infinite
      for loop inside lock_hrtimer_base() function
      
      This happens because as part of oprofile_cpu_notify(, it tries to
      stop an hrtimer which was never started. These per-cpu hrtimers
      are started when the oprfile is started.
      	echo 1	> /dev/oprofile/enable
      
      This problem also existwhen the cpu is booted with maxcpus parameter
      set. When bringing the remaining cpus online the timers are started
      even if oprofile is not yet enabled.
      
      This patch fix this issue by adding a state variable so that
      these hrtimer start/stop is only attempted when oprofile is
      started
      
      For stable kernels v2.6.35.y and v2.6.36.y.
      Reported-by: default avatarJan Sebastien <s-jan@ti.com>
      Tested-by: default avatarsricharan <r.sricharan@ti.com>
      Signed-off-by: default avatarSantosh Shilimkar <santosh.shilimkar@ti.com>
      Cc: stable@kernel.org
      Signed-off-by: default avatarRobert Richter <robert.richter@amd.com>
      4ac3dbec
  2. 25 Oct, 2010 5 commits
  3. 23 Oct, 2010 2 commits
  4. 22 Oct, 2010 32 commits