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authorCliff Wickman <cpw@sgi.com>2010-07-16 10:11:21 -0500
committerIngo Molnar <mingo@elte.hu>2010-07-17 12:11:48 +0200
commit93a7ca0c3ebe5d931126f1fb732cb9c4518383d4 (patch)
treed1828065df998305b50e1b42ff33b20fc7e33367 /arch/x86
parentf6d8a56693426b1f29ff5cafda8be0d65e4e1870 (diff)
downloadop-kernel-dev-93a7ca0c3ebe5d931126f1fb732cb9c4518383d4.zip
op-kernel-dev-93a7ca0c3ebe5d931126f1fb732cb9c4518383d4.tar.gz
x86, UV: Initialize BAU MMRs only on hubs with cpus
Remove the initialization of MMRs UVH_LB_BAU_SB_ACTIVATION_CONTROL and UVH_BAU_DATA_BROADCAST on UV hubs that have no active cpus. Such initialization on hubs with no active cpus would result in a kernel page fault. This is not of real high priority, because we don't have any such systems (with UV hubs that have no active cpus). But they will be coming. Signed-off-by: Cliff Wickman <cpw@sgi.com> LKML-Reference: <E1OZmZN-0006cW-RC@eag09.americas.sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kernel/tlb_uv.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
index abf3c31..59efb53 100644
--- a/arch/x86/kernel/tlb_uv.c
+++ b/arch/x86/kernel/tlb_uv.c
@@ -1635,12 +1635,16 @@ static int __init uv_bau_init(void)
alloc_intr_gate(vector, uv_bau_message_intr1);
for_each_possible_blade(uvhub) {
- pnode = uv_blade_to_pnode(uvhub);
- /* INIT the bau */
- uv_write_global_mmr64(pnode, UVH_LB_BAU_SB_ACTIVATION_CONTROL,
- ((unsigned long)1 << 63));
- mmr = 1; /* should be 1 to broadcast to both sockets */
- uv_write_global_mmr64(pnode, UVH_BAU_DATA_BROADCAST, mmr);
+ if (uv_blade_nr_possible_cpus(uvhub)) {
+ pnode = uv_blade_to_pnode(uvhub);
+ /* INIT the bau */
+ uv_write_global_mmr64(pnode,
+ UVH_LB_BAU_SB_ACTIVATION_CONTROL,
+ ((unsigned long)1 << 63));
+ mmr = 1; /* should be 1 to broadcast to both sockets */
+ uv_write_global_mmr64(pnode, UVH_BAU_DATA_BROADCAST,
+ mmr);
+ }
}
return 0;
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