[v4,0/2] arm64/PPTT ACPI 6.3 thread flag support

Message

Jeremy Linton Aug. 1, 2019, 3:46 a.m. UTC

ACPI 6.3 adds a flag to the CPU node to indicate whether
the given CPU is a thread. Add a function to return that
information for a given linux logical CPU and then utilize
it while building the arm64 topology.

v3->v4: Remove table revision cache as this code path is only
	       called during boot and there aren't any
	       indications that it presents a perf issue.
	Rebase to 5.3

v2->v3: Clarify and tweak the return from check_acpi_cpu_flag()
	Cache the PPTT table revision to avoid repeat
	      acpi_table_get/put calls in the case of
	      missing or old PPTT tables.

v1->v2:
	Return ENOENT instead on ENONET.

Jeremy Linton (2):
  ACPI/PPTT: Add support for ACPI 6.3 thread flag
  arm64: topology: Use PPTT to determine if PE is a thread

 arch/arm64/kernel/topology.c |  8 ++++--
 drivers/acpi/pptt.c          | 54 +++++++++++++++++++++++++++++++++++-
 include/linux/acpi.h         |  5 ++++
 3 files changed, 63 insertions(+), 4 deletions(-)