[PATCH v2 0/3] x86/intel_rdt: task_work vs task_struct rmid/closid write race

[Valentin Schneider]

Hi folks,

This is a small cleanup + a fix for a race I stumbled upon while staring at
resctrl stuff.

Briefly tested on a Xeon Gold 5120 (m2.xlarge.x86 on Equinix) by bouncing
a few tasks around control groups.

Revisions
=========

v1 -> v2
--------
Empty git diff between the two, but:

o Collected Reviewed-by
o Reworded changelogs (James)
o Split READ_ONCE/WRITE_ONCE changes into separate patch (James)
  (@James: note that I had the audacity to slap your RB to that new patch,
   given that you already reviewed the diff. Hopefully you won't hate the
   CL too much!) 

Cheers,
Valentin

Valentin Schneider (3):
  x86/intel_rdt: Check monitor group vs control group membership earlier
  x86/intel_rdt: Plug task_work vs task_struct {rmid,closid} update race
  x86/intel_rdt: Apply READ_ONCE/WRITE_ONCE to task_struct .rmid &
    .closid

 arch/x86/include/asm/resctrl.h         | 11 ++--
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 71 ++++++++++++++++----------
 2 files changed, 50 insertions(+), 32 deletions(-)

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2.27.0