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authorYinghai Lu <yinghai@kernel.org>2011-03-02 13:22:14 +0300
committerTejun Heo <tj@kernel.org>2011-03-02 18:34:09 +0300
commitce0033307f1b45e23e0c149f56ea4855eb4687ce (patch)
treea6e87fd74269aafacf62805252de181b9d499579 /arch/x86/mm/numa_64.c
parentcc28989437de5617875a2943697fe6ba51a0da8f (diff)
downloadlinux-ce0033307f1b45e23e0c149f56ea4855eb4687ce.tar.xz
x86-64, NUMA: Fix distance table handling
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>
Diffstat (limited to 'arch/x86/mm/numa_64.c')
-rw-r--r--arch/x86/mm/numa_64.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
index 7757d2214fab..541746fdeb4b 100644
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -390,14 +390,12 @@ static void __init numa_nodemask_from_meminfo(nodemask_t *nodemask,
*/
void __init numa_reset_distance(void)
{
- size_t size;
+ size_t size = numa_distance_cnt * numa_distance_cnt * sizeof(numa_distance[0]);
- if (numa_distance_cnt) {
- size = numa_distance_cnt * sizeof(numa_distance[0]);
+ if (numa_distance_cnt)
memblock_x86_free_range(__pa(numa_distance),
__pa(numa_distance) + size);
- numa_distance_cnt = 0;
- }
+ numa_distance_cnt = 0;
numa_distance = NULL;
}