linux-kernel - Re: [RFC PATCH 1/2] riscv/spinlock: Strengthen implementations with fences

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Message-ID: <mhng-994ef724-c752-4667-a119-8db6407464df@palmer-si-x1c4>
Date:   Thu, 08 Mar 2018 14:11:12 -0800 (PST)
From:   Palmer Dabbelt <palmer@...ive.com>
To:     parri.andrea@...il.com
CC:     albert@...ive.com, Daniel Lustig <dlustig@...dia.com>,
        stern@...land.harvard.edu, Will Deacon <will.deacon@....com>,
        peterz@...radead.org, boqun.feng@...il.com, npiggin@...il.com,
        dhowells@...hat.com, j.alglave@....ac.uk, luc.maranget@...ia.fr,
        paulmck@...ux.vnet.ibm.com, akiyks@...il.com, mingo@...nel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject:     Re: [RFC PATCH 1/2] riscv/spinlock: Strengthen implementations with fences

On Thu, 08 Mar 2018 13:03:03 PST (-0800), parri.andrea@...il.com wrote:
> On Wed, Mar 07, 2018 at 10:33:49AM -0800, Palmer Dabbelt wrote:
>
> [...]
>
>> I'm going to go produce a new set of spinlocks, I think it'll be a bit more
>> coherent then.
>>
>> I'm keeping your other patch in my queue for now, it generally looks good
>> but I haven't looked closely yet.
>
> Patches 1 and 2 address a same issue ("release-to-acquire"); this is also
> expressed, more or less explicitly, in the corresponding commit messages:
> it might make sense to "queue" them together, and to build the new locks
> on top of these (even if this meant "rewrite all of/a large portion of
> spinlock.h"...).

I agree.  IIRC you had a fixup to the first pair of patches, can you submit a 
v2?