x86/platform/UV: Fix kernel panic running RHEL kdump kernel on UV systems
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. Tested-by: Frank Ramsay <framsay@sgi.com> Tested-by: John Estabrook <estabrook@sgi.com> Signed-off-by: Mike Travis <travis@sgi.com> Reviewed-by: Dimitri Sivanich <sivanich@sgi.com> Reviewed-by: Nathan Zimmer <nzimmer@sgi.com> Cc: Alex Thorlton <athorlton@sgi.com> Cc: Andrew Banman <abanman@sgi.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Russ Anderson <rja@sgi.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20160801184050.577755634@asylum.americas.sgi.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -223,6 +223,11 @@ static int __init uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
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if (strncmp(oem_id, "SGI", 3) != 0)
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return 0;
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if (numa_off) {
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pr_err("UV: NUMA is off, disabling UV support\n");
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return 0;
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}
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/* Setup early hub type field in uv_hub_info for Node 0 */
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uv_cpu_info->p_uv_hub_info = &uv_hub_info_node0;
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