linux-kernel - Re: [PATCH v2 04/27] locking/atomic: make atomic*

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Date:   Sat, 8 Jul 2023 06:20:12 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Linux regressions mailing list <regressions@...ts.linux.dev>,
        Mark Rutland <mark.rutland@....com>
Cc:     linux-kernel@...r.kernel.org, akiyks@...il.com,
        boqun.feng@...il.com, corbet@....net, keescook@...omium.org,
        linux@...linux.org.uk, linux-doc@...r.kernel.org,
        mchehab@...nel.org, paulmck@...nel.org, peterz@...radead.org,
        rdunlap@...radead.org, sstabellini@...nel.org, will@...nel.org
Subject: Re: [PATCH v2 04/27] locking/atomic: make atomic*_{cmp,}xchg optional

On 7/8/23 06:07, Linux regression tracking (Thorsten Leemhuis) wrote:
> On 27.06.23 19:07, Guenter Roeck wrote:
>> On Mon, Jun 05, 2023 at 08:01:01AM +0100, Mark Rutland wrote:
>>> Most architectures define the atomic/atomic64 xchg and cmpxchg
>>> operations in terms of arch_xchg and arch_cmpxchg respectfully.
>>>
>>> Add fallbacks for these cases and remove the trivial cases from arch
>>> code. On some architectures the existing definitions are kept as these
>>> are used to build other arch_atomic*() operations.
>>>
>>> Signed-off-by: Mark Rutland <mark.rutland@....com>
>> [...]
>>
>> This patch results in:
>>
>> ERROR: modpost: "__xchg_called_with_bad_pointer" [lib/atomic64_test.ko] undefined!
>>
>> when trying to build sparc64:allmodconfig.
> 
> Guenter, please correct me if I'm wrong:
> 
> This is fixed by Arnd's patch "sparc: mark __arch_xchg() as
> __always_inline", but that afaics sadly hasn't even reached -next yet.
> https://lore.kernel.org/all/20230628094938.2318171-1-arnd@kernel.org/
> 
> Hence adding it to the tracking now that the end of the merge window is
> near:
> 
> #regzbot ^introduced d12157efc8e083c7
> #regzbot title locking/atomic: build error on sparc64:allmodconfig
> #regzbot ignore-activity
> 

Yes, this is correct.

Guenter