x86/resctrl: Use container_of() in delayed_work handlers

mbm_handle_overflow() and cqm_handle_limbo() are both provided with
the domain's work_struct when called, but use get_domain_from_cpu()
to find the domain, along with the appropriate error handling.

container_of() saves some list walking and bitmap testing, use that
instead.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lkml.kernel.org/r/20200708163929.2783-5-james.morse@arm.com

diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c
index d6b92d7..54dffe5 100644 (file)
--- a/arch/x86/kernel/cpu/resctrl/monitor.c
+++ b/arch/x86/kernel/cpu/resctrl/monitor.c
@@ -477,19 +477,13 @@ void cqm_handle_limbo(struct work_struct *work)
        mutex_lock(&rdtgroup_mutex);
 
        r = &rdt_resources_all[RDT_RESOURCE_L3];
-       d = get_domain_from_cpu(cpu, r);
-
-       if (!d) {
-               pr_warn_once("Failure to get domain for limbo worker\n");
-               goto out_unlock;
-       }
+       d = container_of(work, struct rdt_domain, cqm_limbo.work);
 
        __check_limbo(d, false);
 
        if (has_busy_rmid(r, d))
                schedule_delayed_work_on(cpu, &d->cqm_limbo, delay);
 
-out_unlock:
        mutex_unlock(&rdtgroup_mutex);
 }
 
@@ -519,10 +513,7 @@ void mbm_handle_overflow(struct work_struct *work)
                goto out_unlock;
 
        r = &rdt_resources_all[RDT_RESOURCE_L3];
-
-       d = get_domain_from_cpu(cpu, r);
-       if (!d)
-               goto out_unlock;
+       d = container_of(work, struct rdt_domain, mbm_over.work);
 
        list_for_each_entry(prgrp, &rdt_all_groups, rdtgroup_list) {
                mbm_update(r, d, prgrp->mon.rmid);