src/patches/suse-2.6.27.31/patches.arch/ppc-cell-gdb-watchpoints.patch

   1 Subject: Fix GDB watchpoints on Cell
   2 From: Arnd Bergmann <arnd@arndb.de>
   3 References: 456405 - LTC50396
   4
   5 An earlier patch from Jens Osterkamp attempted to fix GDB
   6 watchpoints by enabling the DABRX register at boot time.
   7 Unfortunately, this did not work on SMP setups, where
   8 secondary CPUs were still using the power-on DABRX value.
   9
  10 This introduces the same change for secondary CPUs on cell
  11 as well.
  12
  13 Reported-by: Ulrich Weigand <Ulrich.Weigand@de.ibm.com>
  14 Tested-by: Ulrich Weigand <Ulrich.Weigand@de.ibm.com>
  15 Signed-off-by: Arnd Bergmann <arnd@arndb.de>
  16 Signed-off-by: Paul Mackerras <paulus@samba.org>
  17 Signed-off-by: Olaf Hering <olh@suse.de>
  18
  19 ---
  20  arch/powerpc/platforms/cell/smp.c |    9 +++++++--
  21  1 file changed, 7 insertions(+), 2 deletions(-)
  22
  23 --- a/arch/powerpc/platforms/cell/smp.c
  24 +++ b/arch/powerpc/platforms/cell/smp.c
  25 @@ -129,10 +129,15 @@ static int __init smp_iic_probe(void)
  26         return cpus_weight(cpu_possible_map);
  27  }
  28
  29 -static void __devinit smp_iic_setup_cpu(int cpu)
  30 +static void __devinit smp_cell_setup_cpu(int cpu)
  31  {
  32         if (cpu != boot_cpuid)
  33                 iic_setup_cpu();
  34 +
  35 +       /*
  36 +        * change default DABRX to allow user watchpoints
  37 +        */
  38 +       mtspr(SPRN_DABRX, DABRX_KERNEL | DABRX_USER);
  39  }
  40
  41  static DEFINE_SPINLOCK(timebase_lock);
  42 @@ -192,7 +197,7 @@ static struct smp_ops_t bpa_iic_smp_ops
  43         .message_pass   = smp_iic_message_pass,
  44         .probe          = smp_iic_probe,
  45         .kick_cpu       = smp_cell_kick_cpu,
  46 -       .setup_cpu      = smp_iic_setup_cpu,
  47 +       .setup_cpu      = smp_cell_setup_cpu,
  48         .cpu_bootable   = smp_cell_cpu_bootable,
  49  };
  50