[lkml]   [2019]   [Oct]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] ARM: dt: check MPIDR on MP devices built without SMP
Am 02.10.19 um 13:45 schrieb Nicolas Saenz Julienne:
> Currently, in arm_dt_init_cpu_maps(), the hwid of the boot CPU is read
> from MPIDR on SMP devices and set to 0 for non SMP. This value is then
> matched with the DT cpu nodes' reg property in order to find the boot
> CPU in DT.
> On MP devices build without SMP the cpu DT node contains the expected
> MPIDR yet the hwid is set to 0. With this the function fails to match
> the cpus and uses the default CPU logical map. Making it impossible to
> get the CPU's DT node further down the line. This causes issues with
> cpufreq-dt, as it triggers warnings when not finding a suitable DT node
> on CPU0.
> Change the way we choose whether to get MPIDR or not. Instead of
> depending on SMP check the number of CPUs defined in DT. Anything > 1
> means MPIDR will be available.
> This was seen on a Raspberry Pi 2 build with bcm2835_defconfig.
> Reported-by: " bot" <>
> Signed-off-by: Nicolas Saenz Julienne <>
> ---

Tested-by: Stefan Wahren <>


 \ /
  Last update: 2019-10-03 19:29    [W:0.118 / U:6.396 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site