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Date:   Fri, 31 Aug 2018 00:30:50 +0000
From:   Vineet Gupta <>
To:     Peter Zijlstra <>
CC:     Will Deacon <>,
        Eugeniy Paltsev <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>,
        "" <>
Subject: Re: Patch "asm-generic/bitops/lock.h: Rewrite using atomic_fetch_"
 causes kernel crash

On 08/30/2018 01:45 PM, Peter Zijlstra wrote:
>> Indeed this is the mother of all issues, I tried and system is clearly hosed with
>> and works after.
>> What's amazing is the commit 4aef66c8ae9 which introduced it is from 2016 ;-)
>> Back then we had a retry branch with backoff stuff which I'd reverted for new
>> cores and the merge conflict somehow missed it.
>> @PeterZ I'll create a patch with you as author ? do I need any formal sign offs,
>> acks etc ?
> Well, Will spotted it, give authorship to him, you have my ack per the
> above.

Oops, sorry for the mixup. I have him as author now and pushed to ARC for-curr
(will trickle into linux-next eventually).

> FWIW, also ACK on Will's patch to switch you over to asm-generic bitops
> entirely.

Yeah I'll get it to that and your's after the clear_bit_lock stuff - sorry for
hijacking this thread to that topic now


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