Re: [GIT PULL] Add two-byte cmpxchg emulation function for v7.4

[Paul E. McKenney]

On Tue, Nov 03, 2026 at 03:03:47AM +0100, Jan Engelhardt wrote:
> 
> On Monday 2026-11-02 17:34, David Laight wrote:
> >> 
> >> I can get gcc-17.0.0-20261102 with no further command line options
> >> to turn `atomic_compare_exchange_strong`+uint16 into some object code
> >> that does not contain a call to libatomic, for sh2, sh3, sh4. Haven't 
> >> tried xtensa or the others.
> >> Thus, is the patch really needed?
> >
> >Won't that need a big jump in the minimum supported compiler version?
> 
> 12.0.0-20210420 behaves the same. I just chose 17 because that was
> convenient to try first.

Are you also advocating ditching the single-byte cmpxchg() emulation?
If the compiler really can handle this emulation for all sizes on all
supported compilers on all affected architectures, that is actually not
at all an unattractive approach.

							Thanx, Paul