Messages in this thread | | | Date | Mon, 17 Sep 2007 13:48:35 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH] Add a refcount check in dput() |
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On Mon, 17 Sep 2007 11:21:35 -0700 "Paul Menage" <menage@google.com> wrote:
> On 9/15/07, Andrew Morton <akpm@linux-foundation.org> wrote: > > > > > > + BUG_ON(!atomic_read(&dentry->d_count)); > > > repeat: > > > if (atomic_read(&dentry->d_count) == 1) > > > might_sleep(); > > > > eek, much too aggressive. > > How about the equivalent BUG_ON() in dget()? I figure that they ought > to both be of the same strictness.
The one in dget() is known not to trigger - it's been there for a long time.
My problem with new BUG_ON's is that they get added thinking "no way will this trigger" and lo, they do trigger and lots of people get their testing disrupted for a whole release.
Long-standing checks like the one in dget() should perhaps be removed now that we know they don't trigger - move them under some CONFIG_DEBUG_foo option. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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