https://github.com/torvalds/linux
Revision 9fe0450785abbc04b0ed5d3cf61fcdb8ab656b4b authored by James Morse on 21 February 2020, 16:21:05 UTC, committed by Borislav Petkov on 17 April 2020, 17:35:01 UTC
Resctrl assumes that all CPUs are online when the filesystem is mounted,
and that CPUs remember their CDP-enabled state over CPU hotplug.

This goes wrong when resctrl's CDP-enabled state changes while all the
CPUs in a domain are offline.

When a domain comes online, enable (or disable!) CDP to match resctrl's
current setting.

Fixes: 5ff193fbde20 ("x86/intel_rdt: Add basic resctrl filesystem support")
Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/20200221162105.154163-1-james.morse@arm.com
1 parent b0151da
History
Tip revision: 9fe0450785abbc04b0ed5d3cf61fcdb8ab656b4b authored by James Morse on 21 February 2020, 16:21:05 UTC
x86/resctrl: Preserve CDP enable over CPU hotplug
Tip revision: 9fe0450
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