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From: Tejun Heo <tj@kernel.org>
To: Ziyang Men <ziyang.meme@gmail.com>
Cc: "Shuah Khan" <shuah@kernel.org>, "Tejun Heo" <tj@kernel.org>,
	"Johannes Weiner" <hannes@cmpxchg.org>,
	"Michal Koutný" <mkoutny@suse.com>,
	"Jiri Kosina" <jikos@kernel.org>,
	"Benjamin Tissoires" <bentiss@kernel.org>,
	"David Vernet" <void@manifault.com>,
	"Eduard Zingerman" <eddyz87@gmail.com>,
	"Viktor Malik" <vmalik@redhat.com>,
	"Andrea Righi" <arighi@nvidia.com>,
	"Changwoo Min" <changwoo@igalia.com>,
	"Michal Hocko" <mhocko@kernel.org>,
	"Roman Gushchin" <roman.gushchin@linux.dev>,
	"Shakeel Butt" <shakeel.butt@linux.dev>,
	"Muchun Song" <muchun.song@linux.dev>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"JP Kobryn" <inwardvessel@gmail.com>,
	"Mykola Lysenko" <mykolal@meta.com>,
	"Nathan Chancellor" <nathan@kernel.org>,
	kernel-team@meta.com, linux-kselftest@vger.kernel.org,
	cgroups@vger.kernel.org, linux-input@vger.kernel.org,
	sched-ext@lists.linux.dev, linux-mm@kvack.org,
	bpf@vger.kernel.org, llvm@lists.linux.dev,
	linux-kernel@vger.kernel.org,
	"Emil Tsalapatis" <emil@etsalapatis.com>
Subject: Re: [PATCH v4 1/4] selftests: add shared lib.bpf.mk to build BPF progs and skeletons
Date: Wed, 09 Sep 2026 08:26:33 -1000	[thread overview]
Message-ID: <178897839380.2.8401342105193256410@kernel.org> (raw)
In-Reply-To: <20260908235552.2610256-2-ziyang.meme@gmail.com>

Hello, Ziyang.

This is an AI review. The finding below was reproduced with a local BPF
build using the posted lib.bpf.mk.

On Tue, Sep 08, 2026 at 04:55:49PM -0700, Ziyang Men wrote:
> +$(lib_bpf_vmlinux_h): | $(lib_bpf_vmlinux_stamp) ;

Please make the stamp a normal prerequisite, keeping the empty recipe:

    $(lib_bpf_vmlinux_h): $(lib_bpf_vmlinux_stamp) ;

Changing a macro in a supplied VMLINUX_H updated vmlinux.h, but the same
build left the BPF object and skeleton unchanged. Disassembly still showed
the old constant. With the normal prerequisite, both rebuilt in one
invocation. Touching the input without changing its contents did not rebuild
either.

Thanks.

-- 
tejun

  reply	other threads:[~2026-09-09 18:43 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-08 23:55 [PATCH v4 0/4] selftests: add shared Makefile for BPF selftests and new memcg test Ziyang Men
2026-09-08 23:55 ` [PATCH v4 1/4] selftests: add shared lib.bpf.mk to build BPF progs and skeletons Ziyang Men
2026-09-09 18:26   ` Tejun Heo [this message]
2026-09-08 23:55 ` [PATCH v4 2/4] selftests/cgroup: add memcg_stat_cross_cpu correctness test for flush Ziyang Men
2026-09-08 23:55 ` [PATCH v4 3/4] selftests/hid: build the BPF program via the shared lib.bpf.mk Ziyang Men
2026-09-08 23:55 ` [PATCH v4 4/4] selftests/sched_ext: build BPF schedulers " Ziyang Men

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