x86-64, NUMA: Fix distance table handling

Browse source

NUMA distance table handling has the following problems.

* numa_reset_distance() uses numa_distance * sizeof(numa_distance[0])
  as the table size when it should be using the square of
  numa_distance.

* The same size miscalculation when allocation space for phys_dist in
  numa_emulation().

* In numa_emulation(), phys_dist must be reserved; otherwise, the new
  emulated distance table may overlap it.

Fix them and, while at it, take numa_distance_cnt resetting in
numa_reset_distance() out of the if block to simplify the code a bit.

David Rientjes reported incorrect handling of distance table during
emulation.

-tj: Edited out numa_alloc_distance() related changes which weren't
     necessary and rewrote patch description.

-v2: Ingo was unhappy with 80-column limit induced linebreaks.  Let
     lines run over 80-column.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Reported-by: David Rientjes <rientjes@google.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: David Rientjes <rientjes@google.com>

...

This commit is contained in:

Yinghai Lu 2011-03-02 11:22:14 +01:00 • committed by Tejun Heo

parent cc28989437

commit ce0033307f

2 changed files with 11 additions and 11 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

8

arch/x86/mm/numa_64.c

View file

14

arch/x86/mm/numa_emulation.c

View file