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Subject[tip:x86/uv] x86, UV: Initialize BAU hub map
Commit-ID:  c4026cfd8febcd63dd278894108839f30e525a0e
Gitweb: http://git.kernel.org/tip/c4026cfd8febcd63dd278894108839f30e525a0e
Author: Cliff Wickman <cpw@sgi.com>
AuthorDate: Fri, 30 Jul 2010 14:10:55 -0500
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Sun, 1 Aug 2010 09:18:41 +0200

x86, UV: Initialize BAU hub map

Fix uninitialized uvhub_mask:

- An unitialized bit map variable was causing initialization of
non-existant hubs (this one causes boot panics).

- And the bit map was too small for large machines. This patch
makes it dynamic in size.

- Fix the case where socket 0 has no enabled cpu's. Don't assume
every hub has a socket 0.

- uv_init_per_cpu() should be __init.

Signed-off-by: Cliff Wickman <cpw@sgi.com>
Cc: <stable@kernel.org> # for .35.x
LKML-Reference: <E1Oeuyt-0004XS-0y@eag09.americas.sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
arch/x86/kernel/tlb_uv.c | 26 ++++++++++++++------------
1 files changed, 14 insertions(+), 12 deletions(-)
diff --git a/arch/x86/kernel/tlb_uv.c b/arch/x86/kernel/tlb_uv.c
index 59efb53..312ef02 100644
--- a/arch/x86/kernel/tlb_uv.c
+++ b/arch/x86/kernel/tlb_uv.c
@@ -1484,15 +1484,16 @@ calculate_destination_timeout(void)
/*
* initialize the bau_control structure for each cpu
*/
-static void uv_init_per_cpu(int nuvhubs)
+static void __init uv_init_per_cpu(int nuvhubs)
{
int i;
int cpu;
int pnode;
int uvhub;
+ int have_hmaster;
short socket = 0;
unsigned short socket_mask;
- unsigned int uvhub_mask;
+ unsigned char *uvhub_mask;
struct bau_control *bcp;
struct uvhub_desc *bdp;
struct socket_desc *sdp;
@@ -1516,28 +1517,29 @@ static void uv_init_per_cpu(int nuvhubs)
uvhub_descs = (struct uvhub_desc *)
kmalloc(nuvhubs * sizeof(struct uvhub_desc), GFP_KERNEL);
memset(uvhub_descs, 0, nuvhubs * sizeof(struct uvhub_desc));
+ uvhub_mask = kzalloc((nuvhubs+7)/8, GFP_KERNEL);
for_each_present_cpu(cpu) {
bcp = &per_cpu(bau_control, cpu);
memset(bcp, 0, sizeof(struct bau_control));
pnode = uv_cpu_hub_info(cpu)->pnode;
uvhub = uv_cpu_hub_info(cpu)->numa_blade_id;
- uvhub_mask |= (1 << uvhub);
+ *(uvhub_mask + (uvhub/8)) |= (1 << (uvhub%8));
bdp = &uvhub_descs[uvhub];
bdp->num_cpus++;
bdp->uvhub = uvhub;
bdp->pnode = pnode;
/* kludge: 'assuming' one node per socket, and assuming that
disabling a socket just leaves a gap in node numbers */
- socket = (cpu_to_node(cpu) & 1);;
+ socket = (cpu_to_node(cpu) & 1);
bdp->socket_mask |= (1 << socket);
sdp = &bdp->socket[socket];
sdp->cpu_number[sdp->num_cpus] = cpu;
sdp->num_cpus++;
}
- uvhub = 0;
- while (uvhub_mask) {
- if (!(uvhub_mask & 1))
- goto nexthub;
+ for (uvhub = 0; uvhub < nuvhubs; uvhub++) {
+ if (!(*(uvhub_mask + (uvhub/8)) & (1 << (uvhub%8))))
+ continue;
+ have_hmaster = 0;
bdp = &uvhub_descs[uvhub];
socket_mask = bdp->socket_mask;
socket = 0;
@@ -1551,8 +1553,10 @@ static void uv_init_per_cpu(int nuvhubs)
bcp->cpu = cpu;
if (i == 0) {
smaster = bcp;
- if (socket == 0)
+ if (!have_hmaster) {
+ have_hmaster++;
hmaster = bcp;
+ }
}
bcp->cpus_in_uvhub = bdp->num_cpus;
bcp->cpus_in_socket = sdp->num_cpus;
@@ -1566,11 +1570,9 @@ nextsocket:
socket++;
socket_mask = (socket_mask >> 1);
}
-nexthub:
- uvhub++;
- uvhub_mask = (uvhub_mask >> 1);
}
kfree(uvhub_descs);
+ kfree(uvhub_mask);
for_each_present_cpu(cpu) {
bcp = &per_cpu(bau_control, cpu);
bcp->baudisabled = 0;

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