linux-kernel - Re: [PATCH v3 1/3] arch: add the macro COMPILE

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Message-ID: <CAADnVQLtvygmqCk5QHmHCURAYiLET6BpCxX7TkqmuAdXZ5trZg@mail.gmail.com>
Date: Tue, 26 Aug 2025 20:04:41 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Menglong Dong <menglong8.dong@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Juri Lelli <juri.lelli@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>, 
	Dietmar Eggemann <dietmar.eggemann@....com>, Steven Rostedt <rostedt@...dmis.org>, 
	Benjamin Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>, 
	Valentin Schneider <vschneid@...hat.com>, Alexei Starovoitov <ast@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, John Fastabend <john.fastabend@...il.com>, 
	Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau <martin.lau@...ux.dev>, Eduard <eddyz87@...il.com>, 
	Song Liu <song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>, KP Singh <kpsingh@...nel.org>, 
	Stanislav Fomichev <sdf@...ichev.me>, Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>, 
	tzimmermann@...e.de, simona.vetter@...ll.ch, 
	Jani Nikula <jani.nikula@...el.com>, LKML <linux-kernel@...r.kernel.org>, 
	bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH v3 1/3] arch: add the macro COMPILE_OFFSETS to all the asm-offsets.c

On Thu, Aug 21, 2025 at 2:38 AM Menglong Dong <menglong8.dong@...il.com> wrote:
>
> The include/generated/asm-offsets.h is generated in Kbuild during
> compiling from arch/SRCARCH/kernel/asm-offsets.c. When we want to
> generate another similar offset header file, circular dependency can
> happen.

Is there a way to avoid all this churn?

> For example, we want to generate a offset file include/generated/test.h,
> which is included in include/sched/sched.h. If we generate asm-offsets.h
> first, it will fail, as include/sched/sched.h is included in asm-offsets.c

if so, may be don't add "static inline void migrate_disable()" to sched.h
and instead add it to preempt.h and it will avoid this issue?

> and include/generated/test.h doesn't exist; If we generate test.h first,
> it can't success neither, as include/generated/asm-offsets.h is included
> by it.
>
> In x86_64, the macro COMPILE_OFFSETS is used to avoid such circular
> dependency. We can generate asm-offsets.h first, and if the
> COMPILE_OFFSETS is defined, we don't include the "generated/test.h".
>
> And we define the macro COMPILE_OFFSETS for all the asm-offsets.c for this
> purpose.