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author | Xiaochen Shen <xiaochen.shen@intel.com> | 2019-12-11 23:05:05 +0300 |
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committer | Borislav Petkov <bp@suse.de> | 2020-01-17 21:32:32 +0300 |
commit | 536a0d8e79fb928f2735db37dda95682b6754f9a (patch) | |
tree | 94518299f8858529b18a3d82213989936e8a55bb /fs/proc/Kconfig | |
parent | dc433797c6f639e46824585bbf943578f13d54bf (diff) | |
download | linux-536a0d8e79fb928f2735db37dda95682b6754f9a.tar.xz |
x86/resctrl: Check monitoring static key in the MBM overflow handler
Currently, there are three static keys in the resctrl file system:
rdt_mon_enable_key and rdt_alloc_enable_key indicate if the monitoring
feature and the allocation feature are enabled, respectively. The
rdt_enable_key is enabled when either the monitoring feature or the
allocation feature is enabled.
If no monitoring feature is present (either hardware doesn't support a
monitoring feature or the feature is disabled by the kernel command line
option "rdt="), rdt_enable_key is still enabled but rdt_mon_enable_key
is disabled.
MBM is a monitoring feature. The MBM overflow handler intends to
check if the monitoring feature is not enabled for fast return.
So check the rdt_mon_enable_key in it instead of the rdt_enable_key as
former is the more accurate check.
[ bp: Massage commit message. ]
Fixes: e33026831bdb ("x86/intel_rdt/mbm: Handle counter overflow")
Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/1576094705-13660-1-git-send-email-xiaochen.shen@intel.com
Diffstat (limited to 'fs/proc/Kconfig')
0 files changed, 0 insertions, 0 deletions