Re: [PATCH 0/3] add new strscpy() API for string copy

[Michael Ellerman <mpe@ellerman.id.au>]

On Fri, 2015-05-15 at 11:15 -0400, Chris Metcalf wrote:
> On 05/14/2015 07:10 PM, Michael Ellerman wrote:
> > On Thu, 2015-04-30 at 12:01 -0400, Chris Metcalf wrote:
> >>
> >> I tested the implementation with a simple user-space harness, so I
> >> believe it is correct for the corner cases I could think of.  In
> >> particular I pairwise-tested all the unaligned values of source and
> >> dest, and tested the restriction on src page-crossing at all
> >> unaligned offsets approaching the page boundary.
> > Can you please put that in tools/testing/selftests and merge it as part of the
> > series? That way I can run the tests and be confident it works on powerpc.
> 
> Unfortunately, the strscpy patch series only changes the one previous
> user of the API, which is a tile-architecture-only driver piece, not
> particularly useful for anyone else for testing.
> 
> The testing I did pulled strscpy() and word-at-a-time out into a
> separate, standalone userspace implementation, and tested it there,
> rather than doing tests through the syscall API like 
> tools/testing/selftests.

Not everything in selftests has to or does go through the syscall API.

We (powerpc) have tests of our memcpy/memcmp/load_unaligned_zeropad that are
built as standalone test programs.

Doing that for stuff in lib/string.c does look a bit complicated, because you'd
need to pull in a bunch of kernel headers.

Do you mind posting your test code somewhere so I can run it, and maybe I can
work out how to fold it into a selftest.

cheers