linux-kernel - [PATCH 0/3] printk: add macros to simplify handling struct va

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Message-Id: <20251126-va_format_call-v1-0-8a604a331730@intel.com>
Date: Wed, 26 Nov 2025 12:35:48 +0100
From: Andrzej Hajda <andrzej.hajda@...el.com>
To: Petr Mladek <pmladek@...e.com>, Steven Rostedt <rostedt@...dmis.org>, 
 John Ogness <john.ogness@...utronix.de>, 
 Sergey Senozhatsky <senozhatsky@...omium.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, Danilo Krummrich <dakr@...nel.org>, 
 Andrew Morton <akpm@...ux-foundation.org>, Vlastimil Babka <vbabka@...e.cz>, 
 Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>, 
 Brendan Jackman <jackmanb@...gle.com>, Johannes Weiner <hannes@...xchg.org>, 
 Zi Yan <ziy@...dia.com>, Christoph Lameter <cl@...two.org>, 
 David Rientjes <rientjes@...gle.com>, 
 Roman Gushchin <roman.gushchin@...ux.dev>, Harry Yoo <harry.yoo@...cle.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
 Andrzej Hajda <andrzej.hajda@...el.com>
Subject: [PATCH 0/3] printk: add macros to simplify handling struct
 va_format

This patchset contains patch abstracting out most common bits of va_format uses
into small macro. The macro works as a forwarder of variadic args to va_format
call.
Rough estimates based on dirty cocci script suggests about 180-230 users
could be converted, allowing to remove about 1100-1300 lines of code.
Of course, I do not plan to do it in mass. I just provide two patches to
show the usage and potential.

Signed-off-by: Andrzej Hajda <andrzej.hajda@...el.com>
---
Andrzej Hajda (3):
      printk: add macros to simplify handling struct va_format
      drivers/core: use va_format_call helper
      mm: use va_format_call helper

 drivers/base/core.c    | 32 ++++++--------------------------
 include/linux/printk.h | 30 ++++++++++++++++++++++++++++++
 mm/page_alloc.c        | 14 ++++----------
 mm/slub.c              | 10 +---------
 4 files changed, 41 insertions(+), 45 deletions(-)
---
base-commit: 37a098cc87aafdf4de147851cbf350bb66c51b45
change-id: 20251126-va_format_call-41053ef60fd7

Best regards,
-- 
Andrzej Hajda <andrzej.hajda@...el.com>