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mm/mempolicy: skip unnecessary synchronize_rcu()

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By unconditionally setting wi_state to NULL and conditionally calling
synchronize_rcu(), we can save an unncessary call when there is no
old_wi_state.

Link: https://lkml.kernel.org/r/20250602162345.2595696-2-joshua.hahnjy@gmail.com
Signed-off-by: Joshua Hahn <joshua.hahnjy@gmail.com>
Suggested-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Huang Ying <ying.huang@linux.alibaba.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Byungchul Park <byungchul@sk.com>
Cc: Gregory Price <gourry@gourry.net>
Cc: "Huang, Ying" <ying.huang@linux.alibaba.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Mathew Brost <matthew.brost@intel.com>
Cc: Rakie Kim <rakie.kim@sk.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Joshua Hahn 2025-06-02 09:23:40 -07:00 committed by Andrew Morton
parent 1e6b17b423
commit 1ec8a6e30e
1 changed files with 5 additions and 8 deletions
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13
mm/mempolicy.c
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@ -3703,18 +3703,15 @@ static void wi_state_free(void)
struct weighted_interleave_state *old_wi_state;
mutex_lock(&wi_state_lock);
old_wi_state = rcu_dereference_protected(wi_state,
lockdep_is_held(&wi_state_lock));
if (!old_wi_state) {
mutex_unlock(&wi_state_lock);
return;
}
rcu_assign_pointer(wi_state, NULL);
mutex_unlock(&wi_state_lock);
synchronize_rcu();
kfree(old_wi_state);
if (old_wi_state) {
synchronize_rcu();
kfree(old_wi_state);
}
}
static struct kobj_attribute wi_auto_attr =