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Date: Thu, 28 Mar 2024 07:09:13 +0100
From: "Arnd Bergmann" <arnd@arndb.de>
To: "Vineet Gupta" <vgupta@kernel.org>,
 "David Hildenbrand" <david@redhat.com>, peterx <peterx@redhat.com>
Cc: linux-kernel@vger.kernel.org, "Andrew Morton" <akpm@linux-foundation.org>,
 "Mike Rapoport" <rppt@kernel.org>, "Jason Gunthorpe" <jgg@nvidia.com>,
 "John Hubbard" <jhubbard@nvidia.com>, linux-arm-kernel@lists.infradead.org,
 loongarch@lists.linux.dev, linux-mips@vger.kernel.org,
 linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
 linux-sh@vger.kernel.org, linux-mm@kvack.org,
 linux-perf-users@vger.kernel.org, linux-fsdevel@vger.kernel.org,
 x86@kernel.org, "Ryan Roberts" <ryan.roberts@arm.com>,
 "Alexander Viro" <viro@zeniv.linux.org.uk>,
 "Matt Turner" <mattst88@gmail.com>, "Alexey Brodkin" <abrodkin@synopsys.com>
Subject: Re: [PATCH RFC 0/3] mm/gup: consistently call it GUP-fast
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On Thu, Mar 28, 2024, at 06:51, Vineet Gupta wrote:
> On 3/27/24 09:22, Arnd Bergmann wrote:
>> On Wed, Mar 27, 2024, at 16:39, David Hildenbrand wrote:
>>> On 27.03.24 16:21, Peter Xu wrote:
>>>> On Wed, Mar 27, 2024 at 02:05:35PM +0100, David Hildenbrand wrote:
>>>>
>>>> I'm not sure what config you tried there; as I am doing some build =
tests
>>>> recently, I found turning off CONFIG_SAMPLES + CONFIG_GCC_PLUGINS c=
ould
>>>> avoid a lot of issues, I think it's due to libc missing.  But maybe=
 not the
>>>> case there.
>>> CCin Arnd; I use some of his compiler chains, others from Fedora dir=
ectly. For
>>> example for alpha and arc, the Fedora gcc is "13.2.1".
>>> But there is other stuff like (arc):
>>>
>>> ./arch/arc/include/asm/mmu-arcv2.h: In function 'mmu_setup_asid':
>>> ./arch/arc/include/asm/mmu-arcv2.h:82:9: error: implicit declaration=
 of=20
>>> function 'write_aux_reg' [-Werro
>>> r=3Dimplicit-function-declaration]
>>>     82 |         write_aux_reg(ARC_REG_PID, asid | MMU_ENABLE);
>>>        |         ^~~~~~~~~~~~~
>> Seems to be missing an #include of soc/arc/aux.h, but I can't
>> tell when this first broke without bisecting.
>
> Weird I don't see this one but I only have gcc 12 handy ATM.
>
> =C2=A0=C2=A0=C2=A0 gcc version 12.2.1 20230306 (ARC HS GNU/Linux glibc=
 toolchain -
> build 1360)
>
> I even tried W=3D1 (which according to scripts/Makefile.extrawarn) sho=
uld
> include -Werror=3Dimplicit-function-declaration but don't see this sti=
ll.
>
> Tomorrow I'll try building a gcc 13.2.1 for ARC.

David reported them with the toolchains I built at
https://mirrors.edge.kernel.org/pub/tools/crosstool/
I'm fairly sure the problem is specific to the .config
and tree, not the toolchain though.

>>> or (alpha)
>>>
>>> WARNING: modpost: "saved_config" [vmlinux] is COMMON symbol
>>> ERROR: modpost: "memcpy" [fs/reiserfs/reiserfs.ko] undefined!
>>> ERROR: modpost: "memcpy" [fs/nfs/nfs.ko] undefined!
>>> ERROR: modpost: "memcpy" [fs/nfs/nfsv3.ko] undefined!
>>> ERROR: modpost: "memcpy" [fs/nfsd/nfsd.ko] undefined!
>>> ERROR: modpost: "memcpy" [fs/lockd/lockd.ko] undefined!
>>> ERROR: modpost: "memcpy" [crypto/crypto.ko] undefined!
>>> ERROR: modpost: "memcpy" [crypto/crypto_algapi.ko] undefined!
>>> ERROR: modpost: "memcpy" [crypto/aead.ko] undefined!
>>> ERROR: modpost: "memcpy" [crypto/crypto_skcipher.ko] undefined!
>>> ERROR: modpost: "memcpy" [crypto/seqiv.ko] undefined!
>
> Are these from ARC build or otherwise ?

This was arch/alpha.

      Arnd