linux-kernel - Re: [PATCH 2/2] membarrier: riscv: Provide core serializing command

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Date:   Wed, 06 Dec 2023 06:15:52 -0800 (PST)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     parri.andrea@...il.com
CC:     mathieu.desnoyers@...icios.com, paulmck@...nel.org,
        Paul Walmsley <paul.walmsley@...ive.com>,
        aou@...s.berkeley.edu, mmaas@...gle.com, hboehm@...gle.com,
        striker@...ibm.com, charlie@...osinc.com, rehn@...osinc.com,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject:     Re: [PATCH 2/2] membarrier: riscv: Provide core serializing command

On Wed, 06 Dec 2023 06:11:07 PST (-0800), parri.andrea@...il.com wrote:
>> I see
>>
>> $ git grep "config MEMBARRIER" fab957c11efe2f405e08b9f0d080524bc2631428
>> fab957c11efe2f405e08b9f0d080524bc2631428:init/Kconfig:config MEMBARRIER
>>
>> so IMO this is just one of those forever bugs.  So I'd lean towards
>>
>>    Fixes: fab957c11efe ("RISC-V: Atomic and Locking Code")
>
> Works for me, will apply in v2.
>
>
>> (or anything in that original patch set).  It's not that big of a backport,
>> so I think it's safe enough?
>
> Indeed, I think so.
>
> The final version of this fix will likely depend on some machinery/code
> introduced by 3ccfebedd8cf54 ("powerpc, membarrier: Skip memory barrier
> in switch_mm()"); but, yes, nothing we can't safely adjust I think.

Ya, I guess we'll have to look to know for sure but hopefully it's 
manageable.

> Thanks,
>   Andrea