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Tue, 22 Sep 2026 06:44:40 -0700 (PDT) Date: Tue, 22 Sep 2026 15:44:38 +0200 From: Michal =?utf-8?Q?Koutn=C3=BD?= To: Fuad Tabba Cc: Paolo Bonzini , Sean Christopherson , Shuah Khan , Oliver Upton , Tejun Heo , Johannes Weiner , James Houghton , Will Deacon , Fuad Tabba , kvm@vger.kernel.org, kvmarm@lists.linux.dev, cgroups@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 2/2] selftests/cgroup: Make the object directory an order-only prerequisite Message-ID: References: <20260922071945.693714-1-fuad.tabba@linux.dev> <20260922071945.693714-3-fuad.tabba@linux.dev> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="wz67vp63rqm7k2iu" Content-Disposition: inline In-Reply-To: <20260922071945.693714-3-fuad.tabba@linux.dev> --wz67vp63rqm7k2iu Content-Type: text/plain; protected-headers=v1; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: [PATCH v2 2/2] selftests/cgroup: Make the object directory an order-only prerequisite MIME-Version: 1.0 On Tue, Sep 22, 2026 at 08:19:45AM +0100, Fuad Tabba = wrote: > libcgroup.mk names $(LIBCGROUP_O_DIRS) as a regular prerequisite of > cgroup_util.o. The directory's mtime moves whenever an object is > created or replaced in it, so an incremental KVM selftests build that > rebuilt anything in lib/ recompiles cgroup_util.o and relinks every > test on the following run. I'd expect the other test would recompile stuff in lib/ but not in cgroup/lib/, however that distinction is likely lost when $(OUTPUT) is expanded from the included *.mk file. > Make the directory order-only, as libvfio.mk does. Sensible approach given that vfio. >=20 > Fixes: 2c754a84ff16a ("cgroup: selftests: Move cgroup_util into its own l= ibrary") > Assisted-by: LLM > Signed-off-by: Fuad Tabba > --- > tools/testing/selftests/cgroup/lib/libcgroup.mk | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) Acked-by: Michal Koutn=FD --wz67vp63rqm7k2iu Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iJEEABYKADkWIQRCE24Fn/AcRjnLivR+PQLnlNv4CAUCarKGQhsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMiwyLDIACgkQfj0C55Tb+Ah2DgEA8Xdl3JGOJIGtK6hwQh4u Jb+PcelMIF9Zbpm+LvcVQysA/2EdCxDp5Lq6779UZxftUj9At2iFIuFnLA5vHe4p ZbcI =BJVd -----END PGP SIGNATURE----- --wz67vp63rqm7k2iu--