Re: [PATCH] x86/ioperm: Use atomic64_inc_return() in ksys_ioperm()

[Dave Hansen]

On 10/7/24 01:33, Uros Bizjak wrote:
> Use atomic64_inc_return(&ref) instead of atomic64_add_return(1, &ref)
> to use optimized implementation and ease register pressure around
> the primitive for targets that implement optimized variant.

Ease register pressure at the end of a syscall?

I'll accept that we're doing this just as a matter of hygiene.  But it's
a stretch to say there are any performance concerns whatsoever at the
end of the ioperm() syscall.

So what is the real reason for this patch?