linux-kernel - Re: [PATCH net-next v2] page_pool: fix build on powerpc with GCC 14

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Message-ID: <87h6ahqfbl.fsf@mail.lhotse>
Date: Sun, 15 Sep 2024 22:19:58 +1000
From: Michael Ellerman <mpe@...erman.id.au>
To: Christophe Leroy <christophe.leroy@...roup.eu>, Mina Almasry
 <almasrymina@...gle.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Cc: Jesper Dangaard Brouer <hawk@...nel.org>, Ilias Apalodimas
 <ilias.apalodimas@...aro.org>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, Stephen
 Rothwell <sfr@...b.auug.org.au>, Linux Next Mailing List
 <linux-next@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>,
 "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>, Matthew
 Wilcox <willy@...radead.org>
Subject: Re: [PATCH net-next v2] page_pool: fix build on powerpc with GCC 14

Christophe Leroy <christophe.leroy@...roup.eu> writes:
> Le 14/09/2024 à 04:02, Michael Ellerman a écrit :
...
>> 
>> diff --git a/arch/powerpc/include/asm/atomic.h b/arch/powerpc/include/asm/atomic.h
>> index 5bf6a4d49268..0e41c1da82dd 100644
>> --- a/arch/powerpc/include/asm/atomic.h
>> +++ b/arch/powerpc/include/asm/atomic.h
>> @@ -23,6 +23,12 @@
>>   #define __atomic_release_fence()					\
>>   	__asm__ __volatile__(PPC_RELEASE_BARRIER "" : : : "memory")
>>   
>> +#ifdef CONFIG_CC_IS_CLANG
>> +#define DS_FORM_CONSTRAINT "Z<>"
>> +#else
>> +#define DS_FORM_CONSTRAINT "YZ<>"
>> +#endif
>
> I see we have the same in uaccess.h, added by commit 2d43cc701b96 
> ("powerpc/uaccess: Fix build errors seen with GCC 13/14")

Yep.

> Should that go in a common header, maybe ppc_asm.h ?

That would be the obvious place, but unfortunately including ppc_asm.h
in atomic.h breaks the build due to header spaghetti.

For now I've put the defines in asm-compat.h, which is not ideal but
seems to work.

cheers