Re: [PATCH] atomic: Fix bugs in 'fetch_or()' and rename it to 'xchg_or()'

From: Ingo Molnar
Date: Tue Mar 15 2016 - 08:08:54 EST

* Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:

> On Tue, Mar 15, 2016 at 10:32:45AM +0100, Ingo Molnar wrote:
> > 2) its naming sucks. "fetch_or()" does not really signal that it's a
> > fundamentally atomic operation, nor what API family it belongs to.
> I disagree there, the fetch-$op naming is widely used for atomic
> operations that return the previous value. See for example the C/C++11
> atomic ops.

The problem I see is that we don't really have the fetch_*() naming in the kernel
right now, while we do have the xchg_*() naming. The latter is 'obviously' an
atomic operation - while 'fetch' could be anything.

No strong opinion, but I think fetch_or() is not a particularly good name.