[PATCH 1/2] args.h: add more helpers for manipulating macro arguments

[Michal Wajdeczko]

On 02.05.2024 09:27, Andy Shevchenko wrote:
> On Thu, May 02, 2024 at 12:32:20AM +0200, Michal Wajdeczko wrote:
>> Some advanced macros used to generate code may use helper macros
>> to manipulate the argument lists. Define generic helpers that can
>> replace existing local definitions and allow reuse by new code.
> 
> Acked-by: Andy Shevchenko <andriy.shevchenko at linux.intel.com>
> 
> In general I have no objections, but as I pointed out in the reply to cover
> letter the statistics is a bit scary, i.e. we add too many lines without clear

with another spotted potential user (macro FIRST from bpf_probe.h) and
without comments those statistics will look like:

 drivers/gpu/drm/xe/xe_rtp.h         |  4 ++--
 drivers/gpu/drm/xe/xe_rtp_helpers.h | 26 ++++++++++----------------
 include/linux/args.h                | 26 ++++++++++++++++++++++++++
 include/trace/bpf_probe.h           |  7 ++-----
 4 files changed, 40 insertions(+), 23 deletions(-)

> benefit. Anyway, if people okay with that my tag is above (but also pay
> attention that args.h is used in dozen of cases, including headers, right now
> and this extension may affect a lot the build time of the kernel).

not an expert here, but I guess the cost of parsing another dozen of
lines should negligible compared with opening hundreds of other include
files during compilation ...

> 
> This also has to be sent to LKML.
> 

sure, will do, but first I wanted to collect the results from our CI

Thanks,
Michal