scripts: headers_install.sh: Normalize __ASSEMBLY__ to __ASSEMBLER__

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A previous patch to headers_install.sh normalized the usage of
__ASSEMBLER__ to __ASSEMBLY__ in the UAPI headers due to two reasons:

1) There was the concern that the UAPI headers might be used with
non-GCC-compatible compilers, which do not define __ASSEMBLER__
automatically.

But other C compilers like PCC (see
https://github.com/IanHarvey/pcc/blob/cvs2git/2018.09.20/cc/cc/cc.1#L405)
and Tiny-C (see https://repo.or.cz/tinycc.git/commitdiff/a25325e9be13e52a),
are defining __ASSEMBLER__ for compiling assembler files, too, so using
it in UAPI header files should really be fine.

2) During the migration phase, the UAPI headers will use a mix of *both*
__ASSEMBLY__ and __ASSEMBLER__ at the same time, which is ugly and
inconsistent.

That's true. But since we already shipped a couple of kernel versions
that used __ASSEMBLER__ in the UAPI headers for certain architectures,
we might now break user space programs that have been developed with
these kernel versions if we switch back to __ASSEMBLY__.

Thus let's better always use the macro that is defined by the compilers
and standardize on __ASSEMBLER__ instead of __ASSEMBLY__ in all of the
UAPI header files now.

Suggested-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/all/2030a963-33bc-43fe-9a2b-9c626d7d8360@redhat.com/
Reviewed-by: Nicolas Schier <n.schier@fritz.com>
Tested-by: Nicolas Schier <n.schier@fritz.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Link: https://patch.msgid.link/20260722072928.24500-1-thuth@redhat.com
Signed-off-by: Nicolas Schier <nsc@kernel.org>

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Thomas Huth 2026-07-22 09:29:28 +02:00 • committed by Nicolas Schier

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