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Date: Tue, 7 May 2024 16:28:53 -0700
From: Kees Cook <keescook@...omium.org>
To: Edward Liaw <edliaw@...gle.com>
Cc: shuah@...nel.org, Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>, Nhat Pham <nphamcs@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Christian Brauner <brauner@...nel.org>,
	Eric Biederman <ebiederm@...ssion.com>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Darren Hart <dvhart@...radead.org>,
	Davidlohr Bueso <dave@...olabs.net>,
	André Almeida <andrealmeid@...lia.com>,
	Jiri Kosina <jikos@...nel.org>,
	Benjamin Tissoires <bentiss@...nel.org>,
	Jason Gunthorpe <jgg@...pe.ca>, Kevin Tian <kevin.tian@...el.com>,
	Andy Lutomirski <luto@...capital.net>,
	Will Drewry <wad@...omium.org>, Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	James Morse <james.morse@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Sean Christopherson <seanjc@...gle.com>,
	Anup Patel <anup@...infault.org>,
	Atish Patra <atishp@...shpatra.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Janosch Frank <frankja@...ux.ibm.com>,
	Claudio Imbrenda <imbrenda@...ux.ibm.com>,
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	Mickaël Salaün <mic@...ikod.net>,
	Paul Moore <paul@...l-moore.com>, James Morris <jmorris@...ei.org>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Seth Forshee <sforshee@...nel.org>,
	Bongsu Jeon <bongsu.jeon@...sung.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
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	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Matthieu Baerts <matttbe@...nel.org>,
	Mat Martineau <martineau@...nel.org>,
	Geliang Tang <geliang@...nel.org>,
	Willem de Bruijn <willemdebruijn.kernel@...il.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
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	Dave Hansen <dave.hansen@...ux.intel.com>,
	Muhammad Usama Anjum <usama.anjum@...labora.com>,
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
	kernel-team@...roid.com, linux-sound@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
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	bpf@...r.kernel.org
Subject: Re: [PATCH v2 0/5] Define _GNU_SOURCE for sources using

On Tue, May 07, 2024 at 09:38:25PM +0000, 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

It's a lot of churn, but I don't see a way to do it differently. :)

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook

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