linux-kernel - Re: undefined reference to `cmpxchg8b

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Message-ID: <43259c3d-fbc3-2820-02c1-171d2ae32321@infradead.org>
Date:   Wed, 7 Apr 2021 16:45:46 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     kernel test robot <lkp@...el.com>,
        Chris Wilson <chris@...is-wilson.co.uk>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Maciej Patelczyk <maciej.patelczyk@...el.com>
Subject: Re: undefined reference to `cmpxchg8b_emu'

On 4/7/21 4:34 PM, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   454859c552da78b0f587205d308401922b56863e
> commit: 1c530d431c698f156538b8954b07df95337beb34 dma-buf: Use atomic_fetch_add() for the context id
> date:   11 months ago
> config: um-randconfig-r034-20210407 (attached as .config)
> compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
> reproduce (this is a W=1 build):
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1c530d431c698f156538b8954b07df95337beb34
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout 1c530d431c698f156538b8954b07df95337beb34
>         # save the attached .config to linux build tree
>         make W=1 ARCH=um 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 

Hi robot,

Can you test a patch?
https://lore.kernel.org/lkml/20210404182044.9918-1-rdunlap@infradead.org/


thanks.

-- 
~Randy