linux-kernel - Re: [PATCH] s390: Implement ARCH_HAS_CC_CAN

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Message-ID: <20251222112849.16440C5c-hca@linux.ibm.com>
Date: Mon, 22 Dec 2025 12:28:49 +0100
From: Heiko Carstens <hca@...ux.ibm.com>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Cc: Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] s390: Implement ARCH_HAS_CC_CAN_LINK

On Mon, Dec 22, 2025 at 09:28:17AM +0100, Thomas Weißschuh wrote:
> The generic CC_CAN_LINK detection relies on -m32/-m64 compiler flags.
> s390 toolchains use -m31 instead but that is not supported in the
> kernel.

Some s390 toolchains default to -m31, depending on how they are
built. Actually I'm only aware of a single one. But given that this
one is used all over the place for cross builds it is important
enough.

> Make the logic easier to understand and allow the simplification of the
> generic CC_CAN_LINK by using a tailored implementation.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
> ---
>  arch/s390/Kconfig | 9 +++++++++
>  1 file changed, 9 insertions(+)

Applied, and scheduled for the next merge window. Thanks!