RE: [PATCH -next v4 2/3] x86/mce: rename MCE_IN_KERNEL_COPYIN to MCE_IN_KERNEL_COPY_MC

[Luck, Tony]

> So you have, for example:
>
>  unsigned long __must_check copy_mc_to_kernel(void *dst, const void *src, unsigned len)
>
> Now imagine you get a MCE for *dst which is some kernel page which
> cannot be poisoned: direct map, kernel text, and so on.

At least on Intel you can only get a machine check for operation on poison data LOAD.
Not for a STORE. I believe that is generally true - other arches to confirm.

So there can't me a machine check on "*dst".

-Tony