linux-kernel - Re: [PATCH 00/11] ARC atomics update

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Message-ID: <20210806084104.GA2015@willie-the-truck>
Date:   Fri, 6 Aug 2021 09:41:04 +0100
From:   Will Deacon <will@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        Arnd Bergmann <arnd@...db.de>,
        Mark Rutland <mark.rutland@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        Vladimir Isaev <Vladimir.Isaev@...opsys.com>
Subject: Re: [PATCH 00/11] ARC atomics update

On Thu, Aug 05, 2021 at 07:04:32PM +0200, Peter Zijlstra wrote:
> On Thu, Aug 05, 2021 at 04:18:29PM +0000, Vineet Gupta wrote:
> > On 8/5/21 2:02 AM, Peter Zijlstra wrote:
> > > On Wed, Aug 04, 2021 at 12:15:43PM -0700, Vineet Gupta wrote:
> > > 
> > >> Vineet Gupta (10):
> > >>    ARC: atomics: disintegrate header
> > >>    ARC: atomic: !LLSC: remove hack in atomic_set() for for UP
> > >>    ARC: atomic: !LLSC: use int data type consistently
> > >>    ARC: atomic64: LLSC: elide unused atomic_{and,or,xor,andnot}_return
> > >>    ARC: atomics: implement relaxed variants
> > >>    ARC: bitops: fls/ffs to take int (vs long) per asm-generic defines
> > >>    ARC: xchg: !LLSC: remove UP micro-optimization/hack
> > >>    ARC: cmpxchg/xchg: rewrite as macros to make type safe
> > >>    ARC: cmpxchg/xchg: implement relaxed variants (LLSC config only)
> > >>    ARC: atomic_cmpxchg/atomic_xchg: implement relaxed variants
> > >>
> > >> Will Deacon (1):
> > >>    ARC: switch to generic bitops
> > > 
> > > Didn't see any weird things:
> > > 
> > > Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> > 
> > Thx Peter. A lot of this is your code anyways ;-)
> > 
> > Any initial thoughts/comments on patch 06/11 - is there an obvious 
> > reason that generic bitops take signed @nr or the hurdle is need to be 
> > done consistently cross-arch.
> 
> That does indeed seem daft and ready for a cleanup. Will any
> recollection from when you touched this?

I had a patch to fix this but it blew up in the robot and I didn't get round
to reworking it:

https://lore.kernel.org/patchwork/patch/1245555/

Will