Fenghua Yu f788e450b1 x86/resctrl: Don't move a task to the same resource group ... commit a0195f314a25582b38993bf30db11c300f4f4611 upstream Shakeel Butt reported in [1] that a user can request a task to be moved to a resource group even if the task is already in the group. It just wastes time to do the move operation which could be costly to send IPI to a different CPU. Add a sanity check to ensure that the move operation only happens when the task is not already in the resource group. [1] https://lore.kernel.org/lkml/CALvZod7E9zzHwenzf7objzGKsdBmVwTgEJ0nPgs0LUFU3SN5Pw@mail.gmail.com/ Fixes: e02737d5b826 ("x86/intel_rdt: Add tasks files") Reported-by: Shakeel Butt <shakeelb@google.com> Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Tony Luck <tony.luck@intel.com> Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/962ede65d8e95be793cb61102cca37f7bb018e66.1608243147.git.reinette.chatre@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-04-12 12:51:17 +08:00
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Makefile	Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces.	2021-03-16 11:01:34 +08:00
core.c	x86/resctrl: Fix memory bandwidth counter width for AMD	2021-03-16 16:31:23 +08:00
ctrlmondata.c	Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces.	2021-03-16 11:01:34 +08:00
internal.h	x86/resctrl: Remove unused struct mbm_state::chunks_bw	2021-03-16 16:42:22 +08:00
monitor.c	x86/resctrl: Fix incorrect local bandwidth when mba_sc is enabled	2021-03-16 16:42:22 +08:00
pseudo_lock.c	Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces.	2021-03-16 11:01:34 +08:00
pseudo_lock_event.h	Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces.	2021-03-16 11:01:34 +08:00
rdtgroup.c	x86/resctrl: Don't move a task to the same resource group	2021-04-12 12:51:17 +08:00