perf/x86/intel/uncore: Make package handling more robust

Browse source

The package management code in uncore relies on package mapping being
available before a CPU is started. This changed with:

  9d85eb9119 ("x86/smpboot: Make logical package management more robust")

because the ACPI/BIOS information turned out to be unreliable, but that
left uncore in broken state. This was not noticed because on a regular boot
all CPUs are online before uncore is initialized.

Move the allocation to the CPU online callback and simplify the hotplug
handling. At this point the package mapping is established and correct.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Stephane Eranian <eranian@google.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: Yasuaki Ishimatsu <yasu.isimatu@gmail.com>
Fixes: 9d85eb9119 ("x86/smpboot: Make logical package management more robust")
Link: http://lkml.kernel.org/r/20170131230141.377156255@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>

...

This commit is contained in:

Thomas Gleixner 2017-01-31 23:58:40 +01:00 • committed by Ingo Molnar

parent 1aa6cfd33d

commit fff4b87e59

2 changed files with 91 additions and 107 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

196

arch/x86/events/intel/uncore.c

View file

2

include/linux/cpuhotplug.h

View file