Revision a0195f314a25582b38993bf30db11c300f4f4611 authored by Fenghua Yu on 17 December 2020, 22:31:19 UTC, committed by Borislav Petkov on 08 January 2021, 08:08:03 UTC
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
1 parent ae28d1a
| File | Mode | Size |
|---|---|---|
| Kconfig | -rw-r--r-- | 75.6 KB |
| Makefile | -rw-r--r-- | 1.2 KB |
| calibrate.c | -rw-r--r-- | 8.6 KB |
| do_mounts.c | -rw-r--r-- | 14.9 KB |
| do_mounts.h | -rw-r--r-- | 908 bytes |
| do_mounts_initrd.c | -rw-r--r-- | 3.4 KB |
| do_mounts_rd.c | -rw-r--r-- | 7.7 KB |
| init_task.c | -rw-r--r-- | 6.1 KB |
| initramfs.c | -rw-r--r-- | 13.9 KB |
| main.c | -rw-r--r-- | 37.5 KB |
| noinitramfs.c | -rw-r--r-- | 813 bytes |
| version.c | -rw-r--r-- | 1.3 KB |
Computing file changes ...
