Loading kernel/locking/mcs_spinlock.c +13 −0 Original line number Diff line number Diff line Loading @@ -102,6 +102,19 @@ bool osq_lock(struct optimistic_spin_queue *lock) prev = decode_cpu(old); node->prev = prev; /* * osq_lock() unqueue * * node->prev = prev osq_wait_next() * WMB MB * prev->next = node next->prev = prev // unqueue-C * * Here 'node->prev' and 'next->prev' are the same variable and we need * to ensure these stores happen in-order to avoid corrupting the list. */ smp_wmb(); ACCESS_ONCE(prev->next) = node; /* Loading Loading
kernel/locking/mcs_spinlock.c +13 −0 Original line number Diff line number Diff line Loading @@ -102,6 +102,19 @@ bool osq_lock(struct optimistic_spin_queue *lock) prev = decode_cpu(old); node->prev = prev; /* * osq_lock() unqueue * * node->prev = prev osq_wait_next() * WMB MB * prev->next = node next->prev = prev // unqueue-C * * Here 'node->prev' and 'next->prev' are the same variable and we need * to ensure these stores happen in-order to avoid corrupting the list. */ smp_wmb(); ACCESS_ONCE(prev->next) = node; /* Loading
