[net-next,0/3] compiler_types: add Endianness-dependent __counted_by_{le,be}

Message

Alexander Lobakin March 26, 2024, 4:41 p.m. UTC

Some structures contain flexible arrays at the end and the counter for
them, but the counter has explicit Endianness and thus __counted_by()
can't be used directly.

To increase test coverage for potential problems without breaking
anything, introduce __counted_by_{le,be} defined depending on platform's
Endianness to either __counted_by() when applicable or noop otherwise.
The first user will be virtchnl2.h from idpf just as example with 9 flex
structures having Little Endian counters.

Maybe it would be a good idea to introduce such attributes on compiler
level if possible, but for now let's stop on what we have.

Alexander Lobakin (3):
  compiler_types: add Endianness-dependent __counted_by_{le,be}
  idpf: make virtchnl2.h self-contained
  idpf: sprinkle __counted_by{,_le}() in the virtchnl2 header

 Documentation/conf.py                       |  2 ++
 scripts/kernel-doc                          |  1 +
 include/linux/compiler_types.h              | 11 ++++++++++
 drivers/net/ethernet/intel/idpf/virtchnl2.h | 24 ++++++++++-----------
 4 files changed, 26 insertions(+), 12 deletions(-)

---
From RFC[0]:

* teach kdoc new attributes (Simon, Kees);
* add Acked-by (Kees);
* fix a couple typos;
* send to net-next (Kees).

[0] https://lore.kernel.org/netdev/[e-mail]