The latest UV kernel support panics when RHEL7 kexec's the kdump kernel
to make a dumpfile. This patch fixes the problem by turning off all UV
support if NUMA is off.
Reviewed-by: Dimitri Sivanich <sivan...@sgi.com>
Reviewed-by: Nathan Zimmer <nzim...@sgi.com>
Tested-by: Frank Ramsay <fram...@sgi.com>
Tested-by: John Estabrook <estabr...@sgi.com>
Signed-off-by: Mike Travis <tra...@sgi.com>
---
arch/x86/kernel/apic/x2apic_uv_x.c | 5 +++++
1 file changed, 5 insertions(+)
--- linux-3.12.orig/arch/x86/kernel/apic/x2apic_uv_x.c
+++ linux-3.12/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -223,6 +223,11 @@ static int __init uv_acpi_madt_oem_check
if (strncmp(oem_id, "SGI", 3) != 0)
return 0;
+ if (numa_off) {
+ pr_err("UV: NUMA is off, disabling UV support\n");
+ return 0;
+ }
+
/* Setup early hub type field in uv_hub_info for Node 0 */
uv_cpu_info->p_uv_hub_info = &uv_hub_info_node0;
--
