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

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Message-ID: <a94334d8-0a9a-1cbc-ebfe-1825abfb8307@leemhuis.info>
Date:   Sat, 8 Jul 2023 15:07:46 +0200
From:   "Linux regression tracking (Thorsten Leemhuis)" 
        <regressions@...mhuis.info>
To:     Guenter Roeck <linux@...ck-us.net>,
        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 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

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
That page also explains what to do if mails like this annoy you.