Re: [PATCH] coredump: get machine check errors early rather than during iov_iter

[Jens Axboe]

On 3/5/24 6:33 AM, Tong Tiangen wrote:
> The commit f1982740f5e7 ("iov_iter: Convert iterate*() to inline funcs")
> leads to deadloop in generic_perform_write()[1], due to return value of
> copy_page_from_iter_atomic() changed from non-zero value to zero.
> 
> The code logic of the I/O performance-critical path of the iov_iter is
> mixed with machine check[2], actually, there's no need to complicate it,
> a more appropriate method is to get the error as early as possible in
> the coredump process instead of during the I/O process. In addition,
> the iov_iter performance-critical path can have clean logic.

Looks good to me, and I'm a big fan of getting rid of the copy_mc bits
on the generic iov iterator side:

Reviewed-by: Jens Axboe <axboe@xxxxxxxxx>

-- 
Jens Axboe