linux-kernel - Re: [PATCH 1/3] kcsan: Don't expect 64 bits atomic builtins from 32 bits architectures

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Date:   Fri, 09 Jun 2023 22:55:49 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Marco Elver <elver@...gle.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "kasan-dev@...glegroups.com" <kasan-dev@...glegroups.com>,
        Rohan McLure <rmclure@...ux.ibm.com>
Subject: Re: [PATCH 1/3] kcsan: Don't expect 64 bits atomic builtins from 32
 bits architectures

Christophe Leroy <christophe.leroy@...roup.eu> writes:
> Le 12/05/2023 à 18:09, Marco Elver a écrit :
>> On Fri, 12 May 2023 at 17:31, Christophe Leroy
>> <christophe.leroy@...roup.eu> wrote:
>>>
>>> Activating KCSAN on a 32 bits architecture leads to the following
>>> link-time failure:
>>>
>>>      LD      .tmp_vmlinux.kallsyms1
>>>    powerpc64-linux-ld: kernel/kcsan/core.o: in function `__tsan_atomic64_load':
>>>    kernel/kcsan/core.c:1273: undefined reference to `__atomic_load_8'
>>>    powerpc64-linux-ld: kernel/kcsan/core.o: in function `__tsan_atomic64_store':
>>>    kernel/kcsan/core.c:1273: undefined reference to `__atomic_store_8'
...
>>>
>>> 32 bits architectures don't have 64 bits atomic builtins. Only
>>> include DEFINE_TSAN_ATOMIC_OPS(64) on 64 bits architectures.
>>>
>>> Fixes: 0f8ad5f2e934 ("kcsan: Add support for atomic builtins")
>>> Suggested-by: Marco Elver <elver@...gle.com>
>>> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
>> 
>> Reviewed-by: Marco Elver <elver@...gle.com>
>> 
>> Do you have your own tree to take this through with the other patches?
>
> I don't have my own tree but I guess that it can be taken by Michael for 
> 6.5 via powerpc tree with acks from you and Max.
>
> Michael is that ok for you ?

Yeah I can take it.

cheers