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| author | Valentin Schneider <valentin.schneider@arm.com> | 2020-12-17 14:31:21 -0800 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-01-11 11:43:23 +0100 |
| commit | 6d3b47ddffed70006cf4ba360eef61e9ce097d8f (patch) | |
| tree | 10e43585b7bf84f6866076eddbe72862f223c30d /kernel/tracepoint.c | |
| parent | e0ad6dc8969f790f14bddcfd7ea284b7e5f88a16 (diff) | |
| download | lwn-6d3b47ddffed70006cf4ba360eef61e9ce097d8f.tar.gz lwn-6d3b47ddffed70006cf4ba360eef61e9ce097d8f.zip | |
x86/resctrl: Apply READ_ONCE/WRITE_ONCE to task_struct.{rmid,closid}
A CPU's current task can have its {closid, rmid} fields read locally
while they are being concurrently written to from another CPU.
This can happen anytime __resctrl_sched_in() races with either
__rdtgroup_move_task() or rdt_move_group_tasks().
Prevent load / store tearing for those accesses by giving them the
READ_ONCE() / WRITE_ONCE() treatment.
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/9921fda88ad81afb9885b517fbe864a2bc7c35a9.1608243147.git.reinette.chatre@intel.com
Diffstat (limited to 'kernel/tracepoint.c')
0 files changed, 0 insertions, 0 deletions