Received-SPF: pass (google.com: domain of linux-kernel+bounces-173355-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99;
Date: Wed, 8 May 2024 06:47:03 -0700
In-Reply-To: <20240507214254.2787305-1-edliaw@google.com>
Precedence: bulk
Mime-Version: 1.0
References: <20240507214254.2787305-1-edliaw@google.com>
Message-ID: <ZjuA3aY_iHkjP7bQ@google.com>
Subject: Re: [PATCH v2 0/5] Define _GNU_SOURCE for sources using
From: Sean Christopherson <seanjc@google.com>
To: Edward Liaw <edliaw@google.com>
Cc: shuah@kernel.org, Mark Brown <broonie@kernel.org>, Jaroslav Kysela <perex@perex.cz>, 
	Takashi Iwai <tiwai@suse.com>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, 
	Nhat Pham <nphamcs@gmail.com>, Johannes Weiner <hannes@cmpxchg.org>, 
	Christian Brauner <brauner@kernel.org>, Eric Biederman <ebiederm@xmission.com>, 
	Kees Cook <keescook@chromium.org>, OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>, 
	Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, 
	Peter Zijlstra <peterz@infradead.org>, Darren Hart <dvhart@infradead.org>, 
	Davidlohr Bueso <dave@stgolabs.net>, "=?utf-8?B?QW5kcsOp?= Almeida" <andrealmeid@igalia.com>, 
	Jiri Kosina <jikos@kernel.org>, Benjamin Tissoires <bentiss@kernel.org>, Jason Gunthorpe <jgg@ziepe.ca>, 
	Kevin Tian <kevin.tian@intel.com>, Andy Lutomirski <luto@amacapital.net>, 
	Will Drewry <wad@chromium.org>, Marc Zyngier <maz@kernel.org>, Oliver Upton <oliver.upton@linux.dev>, 
	James Morse <james.morse@arm.com>, Suzuki K Poulose <suzuki.poulose@arm.com>, 
	Zenghui Yu <yuzenghui@huawei.com>, Paolo Bonzini <pbonzini@redhat.com>, 
	Anup Patel <anup@brainfault.org>, Atish Patra <atishp@atishpatra.org>, 
	Paul Walmsley <paul.walmsley@sifive.com>, Palmer Dabbelt <palmer@dabbelt.com>, 
	Albert Ou <aou@eecs.berkeley.edu>, Christian Borntraeger <borntraeger@linux.ibm.com>, 
	Janosch Frank <frankja@linux.ibm.com>, Claudio Imbrenda <imbrenda@linux.ibm.com>, 
	David Hildenbrand <david@redhat.com>, "=?utf-8?Q?Micka=C3=ABl_Sala=C3=BCn?=" <mic@digikod.net>, Paul Moore <paul@paul-moore.com>, 
	James Morris <jmorris@namei.org>, "Serge E. Hallyn" <serge@hallyn.com>, 
	Andrew Morton <akpm@linux-foundation.org>, Seth Forshee <sforshee@kernel.org>, 
	Bongsu Jeon <bongsu.jeon@samsung.com>, "David S. Miller" <davem@davemloft.net>, 
	Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>, 
	Steffen Klassert <steffen.klassert@secunet.com>, Herbert Xu <herbert@gondor.apana.org.au>, 
	"Andreas =?utf-8?Q?F=C3=A4rber?=" <afaerber@suse.de>, Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>, 
	Matthieu Baerts <matttbe@kernel.org>, Mat Martineau <martineau@kernel.org>, 
	Geliang Tang <geliang@kernel.org>, Willem de Bruijn <willemdebruijn.kernel@gmail.com>, 
	Fenghua Yu <fenghua.yu@intel.com>, Reinette Chatre <reinette.chatre@intel.com>, 
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>, "Paul E. McKenney" <paulmck@kernel.org>, 
	Boqun Feng <boqun.feng@gmail.com>, Alexandre Belloni <alexandre.belloni@bootlin.com>, 
	Jarkko Sakkinen <jarkko@kernel.org>, Dave Hansen <dave.hansen@linux.intel.com>, 
	Muhammad Usama Anjum <usama.anjum@collabora.com>, linux-kernel@vger.kernel.org, 
	linux-kselftest@vger.kernel.org, kernel-team@android.com, 
	linux-sound@vger.kernel.org, linux-arm-kernel@lists.infradead.org, 
	linux-mm@kvack.org, linux-input@vger.kernel.org, iommu@lists.linux.dev, 
	kvmarm@lists.linux.dev, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, 
	linux-riscv@lists.infradead.org, linux-security-module@vger.kernel.org, 
	linux-fsdevel@vger.kernel.org, netdev@vger.kernel.org, 
	linux-actions@lists.infradead.org, mptcp@lists.linux.dev, 
	linux-rtc@vger.kernel.org, linux-sgx@vger.kernel.org, bpf@vger.kernel.org
Content-Type: text/plain; charset="us-ascii"

On Tue, May 07, 2024, Edward Liaw wrote:
> 809216233555 ("selftests/harness: remove use of LINE_MAX") introduced
> asprintf into kselftest_harness.h, which is a GNU extension and needs
> _GNU_SOURCE to either be defined prior to including headers or with the
> -D_GNU_SOURCE flag passed to the compiler.
> 
> v1: https://lore.kernel.org/linux-kselftest/20240430235057.1351993-1-edliaw@google.com/
> v2: add -D_GNU_SOURCE to KHDR_INCLUDES so that it is in a single
> location.  Remove #define _GNU_SOURCE from source code to resolve
> redefinition warnings.
> 
> Edward Liaw (5):
>   selftests: Compile kselftest headers with -D_GNU_SOURCE
>   selftests/sgx: Include KHDR_INCLUDES in Makefile
>   selftests: Include KHDR_INCLUDES in Makefile
>   selftests: Drop define _GNU_SOURCE
>   selftests: Drop duplicate -D_GNU_SOURCE

Can you rebase this on top of linux-next?  I have a conflicting fix[*] for the
KVM selftests queued for 6.10, and I would prefer not to drop that commit at
this stage as it would require a rebase of a pile of other commits.

And I doubt KVM is the only subsystem that has a targeted fix for the _GNU_SOURCE
mess.

If we want/need to get a fix into 6.9, then IMO we should just revert 809216233555
("selftests/harness: remove use of LINE_MAX"), as that came in quite late in the
6.9 cycle, and I don't think it's feasible to be 100% confident that globally
defining _GNU_SOURCE works for all selftests, i.e. we really should have a full
cycle for folks to test.

[*] https://github.com/kvm-x86/linux/commit/730cfa45b5f4