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Date: Tue, 1 Sep 2026 15:46:20 -0700
From: Jakub Kicinski <kuba@kernel.org>
To: Maxime Chevallier <maxime.chevallier@bootlin.com>
Cc: Matthieu Baerts <matttbe@kernel.org>, netdev@vger.kernel.org,
 linux-kernel@vger.kernel.org, thomas.petazzoni@bootlin.com,
 linux-kselftest@vger.kernel.org, Andrew Lunn <andrew+netdev@lunn.ch>,
 davem@davemloft.net, Eric Dumazet <edumazet@google.com>, Paolo Abeni
 <pabeni@redhat.com>, Donald Hunter <donald.hunter@gmail.com>, Simon Horman
 <horms@kernel.org>, Shuah Khan <shuah@kernel.org>, Stanislav Fomichev
 <sdf@fomichev.me>
Subject: Re: [PATCH net-next 2/2] selftests: drv-net: Use cross-compilation
 environment for the io_uring check
Message-ID: <20260901154620.492ab980@kernel.org>
In-Reply-To: <20631f9a-1a2f-4ef5-a4c5-e1948e55dd78@bootlin.com>
References: <20260901164200.1124343-1-maxime.chevallier@bootlin.com>
	<20260901164200.1124343-3-maxime.chevallier@bootlin.com>
	<a42cdc44-efaf-44ff-9ace-f08e0c3b9856@kernel.org>
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On Tue, 1 Sep 2026 22:45:47 +0200 Maxime Chevallier wrote:
> Hi Matthieu,
> 
> On 9/1/26 19:24, Matthieu Baerts wrote:
> > Hi Maxime,  
> >> +# Set CC for the io_uring check
> >> +CC := $(CROSS_COMPILE)gcc  
> > 
> > Could we have something similar to
> > tools/testing/selftests/riscv/cfi/Makefile:
> > 
> >   # Set CC for the io_uring check done before including lib.mk
> >   ifeq ($(LLVM)$(CC),cc)
> >   CC := $(CROSS_COMPILE)gcc
> >   endif
> > 
> > WDYT?  
> 
> Ah this is better indeed IMO, I'll use that in V2 then, thanks for
> the tips.
> 
> Initially I considered doing a larger rework of extracting the logic
> in lib.mk that sets CC to the right value base on CROSS_COMPILE, LLVM
> and ARCH into a dedicated .mk file that we would include at the top,
> but at that time it seemed to be too big of a rework for just the
> io_uring check.
> 
> It lead to some headache about double-inclusions and relative paths lookups
> that far exceeded my Makefile skills :(
> 
> Thanks for the review,

I assume you don't actually have luring for your cross- env? Could we
keep it simple and just declare luring as unavailable when cross
compiling? Because the probing compilation rule is probably missing 
more flags to make cross compilation work.

Ignore if selftests using luring do actually work for you after this
patch..