linux-kernel - Re: [PATCH v2] buffer: Fix I/O error due to ARM read-after-read hazard

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Message-ID: <20191121012533.3h6akm4oczswj7zr@gondor.apana.org.au>
Date:   Thu, 21 Nov 2019 09:25:33 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Will Deacon <will@...nel.org>
Cc:     linux@...linux.org.uk, torvalds@...ux-foundation.org,
        catalin.marinas@....com, vincent.whitchurch@...s.com,
        axboe@...nel.dk, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, rabinv@...s.com,
        Richard.Earnshaw@....com
Subject: Re: [PATCH v2] buffer: Fix I/O error due to ARM read-after-read
 hazard

On Wed, Nov 20, 2019 at 07:18:40PM +0000, Will Deacon wrote:
>
> > The Alpha barrier matters for pointers, how could it make a
> > difference for individual bits?
> 
> I guess you could use the result of test_bit to index into an array or
> something?

Can Alpha Assembly even do this without using a branch?

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt