mm: memcontrol: inline memcg->move_lock locking
The wrappers around taking and dropping the memcg->move_lock spinlock add nothing of value. Inline the spinlock calls into the callsites. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Vladimir Davydov <vdavydov@parallels.com> Acked-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -1522,23 +1522,6 @@ static bool mem_cgroup_wait_acct_move(struct mem_cgroup *memcg)
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return false;
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}
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/*
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* Take this lock when
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* - a code tries to modify page's memcg while it's USED.
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* - a code tries to modify page state accounting in a memcg.
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*/
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static void move_lock_mem_cgroup(struct mem_cgroup *memcg,
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unsigned long *flags)
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{
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spin_lock_irqsave(&memcg->move_lock, *flags);
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}
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static void move_unlock_mem_cgroup(struct mem_cgroup *memcg,
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unsigned long *flags)
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{
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spin_unlock_irqrestore(&memcg->move_lock, *flags);
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}
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#define K(x) ((x) << (PAGE_SHIFT-10))
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/**
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* mem_cgroup_print_oom_info: Print OOM information relevant to memory controller.
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@ -2156,9 +2139,9 @@ again:
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if (atomic_read(&memcg->moving_account) <= 0)
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return memcg;
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move_lock_mem_cgroup(memcg, flags);
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spin_lock_irqsave(&memcg->move_lock, *flags);
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if (memcg != pc->mem_cgroup) {
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move_unlock_mem_cgroup(memcg, flags);
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spin_unlock_irqrestore(&memcg->move_lock, *flags);
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goto again;
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}
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*locked = true;
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@ -2176,7 +2159,7 @@ void mem_cgroup_end_page_stat(struct mem_cgroup *memcg, bool locked,
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unsigned long flags)
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{
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if (memcg && locked)
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move_unlock_mem_cgroup(memcg, &flags);
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spin_unlock_irqrestore(&memcg->move_lock, flags);
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rcu_read_unlock();
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}
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@ -3219,7 +3202,7 @@ static int mem_cgroup_move_account(struct page *page,
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if (pc->mem_cgroup != from)
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goto out_unlock;
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move_lock_mem_cgroup(from, &flags);
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spin_lock_irqsave(&from->move_lock, flags);
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if (!PageAnon(page) && page_mapped(page)) {
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__this_cpu_sub(from->stat->count[MEM_CGROUP_STAT_FILE_MAPPED],
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@ -3243,7 +3226,8 @@ static int mem_cgroup_move_account(struct page *page,
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/* caller should have done css_get */
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pc->mem_cgroup = to;
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move_unlock_mem_cgroup(from, &flags);
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spin_unlock_irqrestore(&from->move_lock, flags);
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ret = 0;
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local_irq_disable();
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