[PATCH v3 0/3] Convert vmcore to use an iov_iter

[Al Viro]

On Mon, Dec 13, 2021 at 02:39:24PM +0000, Matthew Wilcox (Oracle) wrote:
> For some reason several people have been sending bad patches to fix
> compiler warnings in vmcore recently.  Here's how it should be done.
> Compile-tested only on x86.  As noted in the first patch, s390 should
> take this conversion a bit further, but I'm not inclined to do that
> work myself.

A couple of notes: please, use iov_iter_count(i) instead of open-coding
i->count.  And there's a preexisting nastiness in read_vmcore() -
generally, a fault halfway through the read() is treated as a short read,
rather than -EFAULT...