Fenghua Yu a0195f314a x86/resctrl: Don't move a task to the same resource group ... 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: e02737d5b8 ("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		2021-01-08 09:08:03 +01:00
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alpha	A treewide cleanup of interrupt descriptor (ab)use with all sorts of racy	2020-12-24 13:50:23 -08:00
arc	tif-task_work.arch-2020-12-14	2020-12-16 12:33:35 -08:00
arm	A treewide cleanup of interrupt descriptor (ab)use with all sorts of racy	2020-12-24 13:50:23 -08:00
arm64	A treewide cleanup of interrupt descriptor (ab)use with all sorts of racy	2020-12-24 13:50:23 -08:00
c6x	tif-task_work.arch-2020-12-14	2020-12-16 12:33:35 -08:00
csky	Tracing updates for 5.11	2020-12-17 13:22:17 -08:00
h8300	tif-task_work.arch-2020-12-14	2020-12-16 12:33:35 -08:00
hexagon	tif-task_work.arch-2020-12-14	2020-12-16 12:33:35 -08:00
ia64	Kbuild updates for v5.11	2020-12-22 14:02:39 -08:00
m68k	Fixes include:	2020-12-21 10:35:11 -08:00
microblaze	epoll: wire up syscall epoll_pwait2	2020-12-19 11:18:38 -08:00
mips	epoll: fix compat syscall wire up of epoll_pwait2	2020-12-20 10:01:38 -08:00
nds32	Tracing updates for 5.11	2020-12-17 13:22:17 -08:00
nios2	tif-task_work.arch-2020-12-14	2020-12-16 12:33:35 -08:00
openrisc	OpenRISC updates for 5.11	2020-12-17 13:41:27 -08:00
parisc	A treewide cleanup of interrupt descriptor (ab)use with all sorts of racy	2020-12-24 13:50:23 -08:00
powerpc	powerpc fixes for 5.11 #2	2020-12-24 14:02:00 -08:00
riscv	RISC-V Fixes for 5.11-rc1	2020-12-24 14:05:05 -08:00
s390	A treewide cleanup of interrupt descriptor (ab)use with all sorts of racy	2020-12-24 13:50:23 -08:00
sh	The core framework got some nice improvements this time around. We gained the	2020-12-21 10:39:37 -08:00
sparc	epoll: fix compat syscall wire up of epoll_pwait2	2020-12-20 10:01:38 -08:00
um	This pull request contains the following changes for UML:	2020-12-17 17:56:44 -08:00
x86	x86/resctrl: Don't move a task to the same resource group	2021-01-08 09:08:03 +01:00
xtensa	The core framework got some nice improvements this time around. We gained the	2020-12-21 10:39:37 -08:00
.gitignore	…
Kconfig	fanotify: Fix sys_fanotify_mark() on native x86-32	2020-12-28 11:58:59 +01:00