Re: [PATCH v2] x86: bring back rep movsq for user access on CPUs without ERMS

[Linus Torvalds]

On Sun, 3 Sept 2023 at 20:07, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> Try it and you'll see it is not even *remotely* as easy as you claim.
> Not when you have to deal with random sizes and padding of 20+
> different architectures.

Perhaps more importantly, nobody actually seems to have the energy to care.

As shown by the fact that even the current really simple "just define
INIT_STRUCT_STAT_PADDING to avoid a pointless memset in a hot path"
has been taken up by exactly zero other architectures than x86.

I wasn't going to fight that kind of history of apathy.

              Linus