x86/MCE/AMD: Allow thresholding interface updates after init
stable inclusion from stable-v5.10.96 commit 08f090bb9b6951a510437ef26ad78ffb3ee17142 bugzilla: https://gitee.com/openeuler/kernel/issues/I55NWB Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=08f090bb9b6951a510437ef26ad78ffb3ee17142 -------------------------------- commit 1f52b0ab upstream. Changes to the AMD Thresholding sysfs code prevents sysfs writes from updating the underlying registers once CPU init is completed, i.e. "threshold_banks" is set. Allow the registers to be updated if the thresholding interface is already initialized or if in the init path. Use the "set_lvt_off" value to indicate if running in the init path, since this value is only set during init. Fixes: a037f3ca ("x86/mce/amd: Make threshold bank setting hotplug robust") Signed-off-by: NYazen Ghannam <yazen.ghannam@amd.com> Signed-off-by: NBorislav Petkov <bp@suse.de> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20220117161328.19148-1-yazen.ghannam@amd.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NYu Liao <liaoyu15@huawei.com> Reviewed-by: NWei Li <liwei391@huawei.com> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
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