Re: [PATCH 0/3] crypto - some SPDX cleanups for arch code

[Eric Biggers <ebiggers@kernel.org>]

On Tue, Jun 06, 2023 at 09:37:30PM -0700, Eric Biggers wrote:
> On Tue, Jun 06, 2023 at 07:31:24PM +0200, Ard Biesheuvel wrote:
> > Some SPDX cleanups for the arch crypto code on ARM, arm64 and x86
> > 
> > Ard Biesheuvel (3):
> >   crypto: arm64 - add some missing SPDX headers
> >   crypto: arm - add some missing SPDX headers
> >   crypto: x86 - add some missing SPDX headers
> > 
> >  arch/arm/crypto/chacha-neon-core.S          | 10 +----
> >  arch/arm/crypto/crc32-ce-core.S             | 30 ++-----------
> >  arch/arm/crypto/crct10dif-ce-core.S         | 40 +----------------
> >  arch/arm64/crypto/chacha-neon-core.S        | 10 +----
> >  arch/arm64/crypto/chacha-neon-glue.c        | 10 +----
> >  arch/arm64/crypto/crct10dif-ce-core.S       | 40 +----------------
> >  arch/x86/crypto/aesni-intel_avx-x86_64.S    | 36 +--------------
> >  arch/x86/crypto/camellia-aesni-avx-asm_64.S |  7 +--
> >  arch/x86/crypto/crc32-pclmul_glue.c         | 24 +---------
> >  arch/x86/crypto/crc32c-pcl-intel-asm_64.S   | 29 +-----------
> >  arch/x86/crypto/crct10dif-pcl-asm_64.S      | 36 +--------------
> >  arch/x86/crypto/crct10dif-pclmul_glue.c     | 16 +------
> >  arch/x86/crypto/sha1_avx2_x86_64_asm.S      | 46 +-------------------
> >  arch/x86/crypto/sha1_ni_asm.S               | 46 +-------------------
> >  arch/x86/crypto/sha256-avx-asm.S            | 28 +-----------
> >  arch/x86/crypto/sha256-avx2-asm.S           | 29 +-----------
> >  arch/x86/crypto/sha256-ssse3-asm.S          | 29 +-----------
> >  arch/x86/crypto/sha256_ni_asm.S             | 46 +-------------------
> >  arch/x86/crypto/sha256_ssse3_glue.c         | 15 +------
> >  arch/x86/crypto/sha512-avx-asm.S            | 29 +-----------
> >  arch/x86/crypto/sha512-avx2-asm.S           | 29 +-----------
> >  arch/x86/crypto/sha512-ssse3-asm.S          | 29 +-----------
> >  arch/x86/crypto/sha512_ssse3_glue.c         | 16 +------
> >  arch/x86/crypto/twofish_glue.c              | 16 +------
> >  24 files changed, 26 insertions(+), 620 deletions(-)
> 
> Reviewed-by: Eric Biggers <ebiggers@google.com>
> 

Actually, given the discussion on the other thread
https://lore.kernel.org/r/20230607053940.39078-10-bagasdotme@gmail.com, maybe it
would be best to hold off on this for now?  Or at least split this series into
more patches, such that each patch does only one "type" of SPDX replacement.

I still think these conversions are probably fine, but some points that perhaps
need an explicit explanation are:

* Using GPL-2.0-only for files like chacha-neon-core.S whose file header says
  GPL v2, but also says GPL v2 or later.

* Replacing with SPDX on files that explicitly say "DO NOT ALTER OR REMOVE
  COPYRIGHT NOTICES OR THIS FILE HEADER."

* Using BSD-3-Clause when the license text in the file header has the copyright
  holder name instead of "copyright holder", thus making it not an exact
  word-for-word match with LICENSES/preferred/BSD-3-Clause.  (It seems there are
  specific rules for variations that have been approved, e.g. see
  https://github.com/spdx/license-list-XML/blob/main/src/BSD-3-Clause.xml and
  https://spdx.github.io/spdx-spec/v2.2.2/license-matching-guidelines-and-templates)

* Using "GPL-2.0-only OR BSD-3-Clause" for the two crct10dif-ce-core.S files.
  They have an unusual file header, and it could be argued that some
  contributions to those files were intended to be licensed under GPL-2.0-only.
  FWIW, I am fine with either license for my contributions to those files.

- Eric