tiomap-dev team mailing list archive

[warmcat <1018141@xxxxxxxxxxxxxxxxxx>]

Dave it's complaining about the kzalloc in omap2_dpll_round_rate() which
you added to generate the rate cache.

Actually I don't know what it's complaining about exactly except somehow
it's a "bad time to do kzalloc()", and it's the only code that triggers
the problem.

Since there are only a handful of discrete frequencies, I guess you
should make a patch which adapts this code to use a static array of
struct dpll_rate_list and a static "high water mark" replacing kzalloc.
If it reaches the size of the array, just don't cache the result any
more.  Or, if you can see what the actual complaint is really about
attacking it that way is also an option.

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https://bugs.launchpad.net/bugs/1018141

Title:
  lockdep warning during boot with tilt-3.4

Status in Linaro Texas Instruments Landing Team:
  Confirmed
Status in Linaro Ubuntu Evaluation Builds:
  Confirmed

Bug description:
  [    1.726135] ------------[ cut here ]------------
  [    1.731018] WARNING: at /build/buildd/linux-linaro-lt-omap-3.4-3.4.0/kernel/lockdep.c:2739 lockdep_trace_alloc+0x29/0x34()
  [    1.742492] Modules linked in:
  [    1.745758] [<c0011011>] (unwind_backtrace+0x1/0x90) from [<c002b409>] (warn_slowpath_common+0x39/0x50)
  [    1.755554] [<c002b409>] (warn_slowpath_common+0x39/0x50) from [<c002b435>] (warn_slowpath_null+0x15/0x16)
  [    1.765594] [<c002b435>] (warn_slowpath_null+0x15/0x16) from [<c005ce89>] (lockdep_trace_alloc+0x29/0x34)
  [    1.775573] [<c005ce89>] (lockdep_trace_alloc+0x29/0x34) from [<c00b8231>] (kmem_cache_alloc_trace+0x21/0x100)
  [    1.785980] [<c00b8231>] (kmem_cache_alloc_trace+0x21/0x100) from [<c0023011>] (omap2_dpll_round_rate+0xfd/0x138)
  [    1.796691] [<c0023011>] (omap2_dpll_round_rate+0xfd/0x138) from [<c0024417>] (omap4460_mpu_dpll_round_rate+0x17/0x22)
  [    1.807800] [<c0024417>] (omap4460_mpu_dpll_round_rate+0x17/0x22) from [<c0022bcd>] (omap2_clk_round_rate+0xf/0x14)
  [    1.818664] [<c0022bcd>] (omap2_clk_round_rate+0xf/0x14) from [<c0025877>] (clk_round_rate+0x33/0x54)
  [    1.828277] [<c0025877>] (clk_round_rate+0x33/0x54) from [<c071a0e1>] (omap_init_opp_table+0x69/0x128)
  [    1.837982] [<c071a0e1>] (omap_init_opp_table+0x69/0x128) from [<c071a21b>] (omap4_opp_init+0x37/0x74)
  [    1.847686] [<c071a21b>] (omap4_opp_init+0x37/0x74) from [<c00085f5>] (do_one_initcall+0x69/0xf4)
  [    1.856933] [<c00085f5>] (do_one_initcall+0x69/0xf4) from [<c0711683>] (do_basic_setup+0x6b/0x90)
  [    1.866180] [<c0711683>] (do_basic_setup+0x6b/0x90) from [<c07116f7>] (kernel_init+0x4f/0xb8)
  [    1.875061] [<c07116f7>] (kernel_init+0x4f/0xb8) from [<c000cbfd>] (kernel_thread_exit+0x1/0x6)
  [    1.884155] ---[ end trace 0da3e76b87a358c1 ]---

  Using kernel:
  linux-linaro-lt-omap-3.4 (3.4.0-1.1~120625232503) precise; urgency=low-lt-omap/ch

    * Packaged version of lt-omap kernel created from:    
      Kernel:
      Repo: git://git.linaro.org/landing-teams/working/ti/kernel.git
      Branch: tilt-3.4
      Head:
          commit 61abde21bf6272908466e2d13acd479743b4f0b3
          Author: Jaswinder Singh <jaswinder.singh.org>
          Date:   Fri Jun 22 11:26:22 2012 +0800
          
              omapdss temp hack ignore resume runtime_pm fail
              
              Signed-off-by: Jaswinder Singh <jaswinder.singh.org>
      
      Board config fragment:
      Repo: git://git.linaro.org/kernel/configs.git
      Branch: config-boards-3.4
      Head:
          commit b7274f7e11c782039d94a6662c823e339c21dd50
          Author: Ricardo Salveti de Araujo <ricardo.salveti.org>
          Date:   Mon Jun 25 15:30:04 2012 -0300
          
              configs: omap4: disabling CPU_IDLE due bug 971091
              
              Signed-off-by: Ricardo Salveti de Araujo <ricardo.salveti.org>
      
      Ubuntu and Linaro Base config fragments:
      Repo: git://git.linaro.org/kernel/configs.git
      Branch: config-core-3.4
      Head:
          commit 072bd6cb29aa25a3fe0f6be08af48f5a58eae849
          Author: Ricardo Salveti de Araujo <ricardo.salveti.org>
          Date:   Mon Jun 25 18:06:06 2012 -0300
          
              configs: ubuntu: disabling CGROUPS as default
              
              Not yet stable enough to be used as default for all boards we currently
              support at Linaro.
              
              Signed-off-by: Ricardo Salveti de Araujo <ricardo.salveti.org>
      
      Packaging template:
      Repo: git://git.linaro.org/ubuntu/linux-linaro-quantal.git
      Branch: linaro-ubuntu-packaging-3.4
      Head:
          commit 3da2b9971c9fbd9d039bf902ee8d31fdc8cc16f2
          Author: John Rigby <john.rigby.org>
          Date:   Mon Jun 25 15:04:23 2012 -0600
          
              LINARO: template debian.linaro based on omap only version
              
              Signed-off-by: John Rigby <john.rigby.org>

   -- John Rigby <john.rigby@xxxxxxxxxx>  Mon, 25 Jun 2012 15:04:22
  -0600

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