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| author | Anton Blanchard <anton@samba.org> | 2011-01-29 12:24:34 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-02-07 13:05:59 +1100 |
| commit | 5de1669910a59025e6cf24baef242a6c264d5752 (patch) | |
| tree | b85d2785c50a5c3edb1babde904aba0c33618530 | |
| parent | cd9d6cc7266ca7f3ad9bacb3262a0fda38f13c6f (diff) | |
| download | blackbird-op-linux-5de1669910a59025e6cf24baef242a6c264d5752.tar.gz blackbird-op-linux-5de1669910a59025e6cf24baef242a6c264d5752.zip | |
powerpc/numa: Only use active VPHN count fields
VPHN supports up to 8 distance fields but the number of entries in
ibm,associativity-reference-points signifies how many are in use.
Don't look at all the VPHN counts, only distance_ref_points_depth
worth.
Since we already cap our distance metrics at MAX_DISTANCE_REF_POINTS,
use that to size the VPHN arrays and add a BUILD_BUG_ON to avoid it growing
larger than the VPHN maximum of 8.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
| -rw-r--r-- | arch/powerpc/mm/numa.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c index 9e36cafe3078..f25633d3d008 100644 --- a/arch/powerpc/mm/numa.c +++ b/arch/powerpc/mm/numa.c @@ -1291,8 +1291,7 @@ u64 memory_hotplug_max(void) /* Virtual Processor Home Node (VPHN) support */ #ifdef CONFIG_PPC_SPLPAR -#define VPHN_NR_CHANGE_CTRS (8) -static u8 vphn_cpu_change_counts[NR_CPUS][VPHN_NR_CHANGE_CTRS]; +static u8 vphn_cpu_change_counts[NR_CPUS][MAX_DISTANCE_REF_POINTS]; static cpumask_t cpu_associativity_changes_mask; static int vphn_enabled; static void set_topology_timer(void); @@ -1305,12 +1304,15 @@ static void setup_cpu_associativity_change_counters(void) { int cpu; + /* The VPHN feature supports a maximum of 8 reference points */ + BUILD_BUG_ON(MAX_DISTANCE_REF_POINTS > 8); + for_each_possible_cpu(cpu) { int i; u8 *counts = vphn_cpu_change_counts[cpu]; volatile u8 *hypervisor_counts = lppaca[cpu].vphn_assoc_counts; - for (i = 0; i < VPHN_NR_CHANGE_CTRS; i++) + for (i = 0; i < distance_ref_points_depth; i++) counts[i] = hypervisor_counts[i]; } } @@ -1338,7 +1340,7 @@ static int update_cpu_associativity_changes_mask(void) u8 *counts = vphn_cpu_change_counts[cpu]; volatile u8 *hypervisor_counts = lppaca[cpu].vphn_assoc_counts; - for (i = 0; i < VPHN_NR_CHANGE_CTRS; i++) { + for (i = 0; i < distance_ref_points_depth; i++) { if (hypervisor_counts[i] > counts[i]) { counts[i] = hypervisor_counts[i]; changed = 1; |
