Messages in this thread | | | Date | Wed, 1 Mar 2023 15:46:41 -0500 | From | Steven Rostedt <> | Subject | Re: [PATCH] rcu: use try_cmpxchg in check_cpu_stall |
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On Wed, 1 Mar 2023 12:36:45 -0800 "Paul E. McKenney" <paulmck@kernel.org> wrote:
> Some years down the road, should cmpxchg_success() be on the tip of > the tongue of every kernel hacker, perhaps. Or perhaps not.
A bit of a catch-22 I would say. It will only become something everyone knows if it exists.
> > In the meantime, we have yet another abysmally documented atomic
Is it?
> operation that is not well known throughout the community. And then the > people coming across this curse everyone who had anything to do with it, > as they search the source code, dig through assembly output, and so on > trying to work out exactly what this thing does. > > Sorry, but no way. > > Again, unless there is some sort of forward-progress argument or > similar convincing argument.
Speaking of forward progress...
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/atomic_t.txt#n316
Anyway, I'm guessing this will not become part of rcu any time soon. But for the ring buffer, I would happily take it.
-- Steve
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