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uprobes: Change filter_chain() to iterate ->consumers list

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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>
This commit is contained in:
Oleg Nesterov 2012-11-24 18:15:46 +01:00
parent e591c8d78e
commit 1ff6fee5e6
1 changed files with 13 additions and 8 deletions
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21
kernel/events/uprobes.c
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@ -614,14 +614,19 @@ static int prepare_uprobe(struct uprobe *uprobe, struct file *file,
static bool filter_chain(struct uprobe *uprobe)
{
/*
* TODO:
* for_each_consumer(uc)
* if (uc->filter(...))
* return true;
* return false;
*/
return uprobe->consumers != NULL;
struct uprobe_consumer *uc;
bool ret = false;
down_read(&uprobe->consumer_rwsem);
for (uc = uprobe->consumers; uc; uc = uc->next) {
/* TODO: ret = uc->filter(...) */
ret = true;
if (ret)
break;
}
up_read(&uprobe->consumer_rwsem);
return ret;
}
static int