On Mon, Jun 24, 2013 at 12:24:39PM -0400, Steven Rostedt wrote:
> > Ah, this is the first victim of my new 'check sanity of nodes during list
> > walks' patch.
> > It's doing the same prev->next next->prev checking as list_add and friends.
> > I'm looking at getting it into shape for a 3.12 merge after some other
> > preparatory patches
> > go into 3.11
>
> OK, and you may need to make an exception for the ring buffer. To do a
> lockless swap out of the reader page for one of the pages in the buffer,
> it uses the 2 LSB as flags. Notice the "next=ffff880243288001", that "1"
> is a flag that states the next page is the "header" page (next to be
> read). We use cmpxchg to update the pages to handle races between the
> reader and writer.
I just had a plumber come visit to replace my toilet.
I think even he would say "dude, gross" about that hack.
Dave
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