On Sat, May 05, 2018 at 07:51:18AM -0500, Eric W. Biederman wrote:

Christoph Hellwig [off-list ref] writes:

quoted

Use remove_proc_subtree to remove the whole subtree on cleanup, and
unwind the registration loop into individual calls.  Switch to use
proc_create_seq where applicable.

Can you please explain why you are removing the error handling when
you are unwinding the registration loop?

Because there is no point in handling these errors.  The code work
perfectly fine without procfs, or without given proc files and the
removal works just fine if they don't exist either.  This is a very
common patter in various parts of the kernel already.

I'll document it better in the changelog.