On Mon, 4 Mar 2024 at 03:56, David Howells <dhowells@xxxxxxxxxx> wrote:
>
> That said, I wonder if:
>
> #ifdef copy_mc_to_kernel
>
> should be:
>
> #ifdef CONFIG_ARCH_HAS_COPY_MC
Hmm. Maybe. We do have that
#ifdef copy_mc_to_kernel
pattern already in <linux/uaccess.h>, so clearly we've done it both ways.
I personally like the "just test for the thing you are using" model,
which is then why I did it that way, but I don't have hugely strong
opinions on it.
> and whether it's possible to find out dynamically if MCEs can occur at all.
I really wanted to do something like that, and look at the source page
to decide "is this a pmem page that can cause machine checks", but I
didn't find any obvious way to do that.
Improvement suggestions more than welcome.
Linus
