On Sun, Jul 01, 2018 at 08:52:20AM -0700, Dan Williams wrote:
> By mistake the ITER_PIPE early-exit / warning from copy_from_iter() was
> cargo-culted in _copy_to_iter_mcsafe() rather than a machine-check-safe
> version of copy_to_iter_pipe().
>
> Implement copy_pipe_to_iter_mcsafe() being careful to return the
> indication of short copies due to a CPU exception.
>
> Without this regression-fix all splice reads to dax-mode files fail.
>
> Fixes: 8780356ef630 ("x86/asm/memcpy_mcsafe: Define copy_to_iter_mcsafe()")
> Cc: Al Viro <[email protected]>
> Cc: Andrew Morton <[email protected]>
> Cc: Andy Lutomirski <[email protected]>
> Cc: Borislav Petkov <[email protected]>
> Cc: Linus Torvalds <[email protected]>
> Cc: Peter Zijlstra <[email protected]>
> Cc: Thomas Gleixner <[email protected]>
> Cc: Tony Luck <[email protected]>
> Reported-by: Ross Zwisler <[email protected]>
> Signed-off-by: Dan Williams <[email protected]>
Tested-by: Ross Zwisler <[email protected]>
