[PATCH] Add support for Linux error EHWPOISON

[KOSAKI Motohiro]

> +@comment errno.h
> +@comment Linux: Memory page has hardware error
> +@deftypevr Macro int EHWPOISON
> +@comment errno ???/???

Just note. Several syscalls (e.g. ptrace, mlock, futex) take a
memory address argument and kernel might detect a memory which
pointed by it are corrupted. At that time, kernel return EHWPOISON.

But, I'm not sure texinfo should describe such very detail and
internal thing or not. just fyi.