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x86/resctrl: Fix to restore to original value when re-enabling hardwa…
…re prefetch register [ Upstream commit 499c8bb ] The current pseudo_lock.c code overwrites the value of the MSR_MISC_FEATURE_CONTROL to 0 even if the original value is not 0. Therefore, modify it to save and restore the original values. Fixes: 018961a ("x86/intel_rdt: Pseudo-lock region creation/removal core") Fixes: 443810f ("x86/intel_rdt: Create debugfs files for pseudo-locking testing") Fixes: 8a2fc0e ("x86/intel_rdt: More precise L2 hit/miss measurements") Signed-off-by: Kohei Tarumizu <tarumizu.kohei@fujitsu.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Reinette Chatre <reinette.chatre@intel.com> Link: https://lkml.kernel.org/r/eb660f3c2010b79a792c573c02d01e8e841206ad.1661358182.git.reinette.chatre@intel.com Signed-off-by: Sasha Levin <sashal@kernel.org>
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