On Wed, 12 Jun 2019 01:08:36 +0530 Shyam Saini [off-list ref] wrote:

Currently, there are 3 different macros, namely sizeof_field, SIZEOF_FIELD
and FIELD_SIZEOF which are used to calculate the size of a member of
structure, so to bring uniformity in entire kernel source tree lets use
FIELD_SIZEOF and replace all occurrences of other two macros with this.

For this purpose, redefine FIELD_SIZEOF in include/linux/stddef.h and
tools/testing/selftests/bpf/bpf_util.h and remove its defination from
include/linux/kernel.h

In favour of FIELD_SIZEOF, this patch also deprecates other two similar
macros sizeof_field and SIZEOF_FIELD.

For code compatibility reason, retain sizeof_field macro as a wrapper macro
to FIELD_SIZEOF

As Alexey has pointed out, C structs and unions don't have fields -
they have members.  So this is an opportunity to switch everything to
a new member_sizeof().

What do people think of that and how does this impact the patch footprint?