uprobes: Change filter_chain() to iterate ->consumers list
Now that it safe to use ->consumer_rwsem under ->mmap_sem we can almost finish the implementation of filter_chain(). It still lacks the actual uc->filter(...) call but othewrwise it is ready, just it pretends that ->filter() always returns true. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
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@ -614,14 +614,19 @@ static int prepare_uprobe(struct uprobe *uprobe, struct file *file,
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static bool filter_chain(struct uprobe *uprobe)
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{
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/*
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* TODO:
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* for_each_consumer(uc)
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* if (uc->filter(...))
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* return true;
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* return false;
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*/
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return uprobe->consumers != NULL;
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struct uprobe_consumer *uc;
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bool ret = false;
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down_read(&uprobe->consumer_rwsem);
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for (uc = uprobe->consumers; uc; uc = uc->next) {
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/* TODO: ret = uc->filter(...) */
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ret = true;
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if (ret)
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break;
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}
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up_read(&uprobe->consumer_rwsem);
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return ret;
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}
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static int
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