From: Peter Zijlstra <peterz@infradead.org>
To: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Cc: "linux-snps-arc@lists.infradead.org"
<linux-snps-arc@lists.infradead.org>,
Will Deacon <will@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Mark Rutland <mark.rutland@arm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
Vladimir Isaev <Vladimir.Isaev@synopsys.com>
Subject: Re: [PATCH 00/11] ARC atomics update
Date: Thu, 5 Aug 2021 19:04:32 +0200 [thread overview]
Message-ID: <YQwaIIFvzdNcWnww@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <2c2bed36-1bcf-ae34-0e94-9110c7e2b242@synopsys.com>
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@infradead.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?
AFAICT bitops/atomic.h is consistently 'unsigned int nr', but
bitops/non-atomic.h is 'int nr' while bitops/instrumented-non-atomic.h
is consistently 'long nr'.
I'm thinking 'unsigned int nr' is the most sensible allround, but I've
not gone through all the cases.
next prev parent reply other threads:[~2021-08-05 17:04 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-04 19:15 Vineet Gupta
2021-08-04 19:15 ` [PATCH 01/11] ARC: atomics: disintegrate header Vineet Gupta
2021-08-04 19:15 ` [PATCH 02/11] ARC: atomic: !LLSC: remove hack in atomic_set() for for UP Vineet Gupta
2021-08-04 19:15 ` [PATCH 03/11] ARC: atomic: !LLSC: use int data type consistently Vineet Gupta
2021-08-04 19:15 ` [PATCH 04/11] ARC: atomic64: LLSC: elide unused atomic_{and,or,xor,andnot}_return Vineet Gupta
2021-08-04 19:15 ` [PATCH 05/11] ARC: atomics: implement relaxed variants Vineet Gupta
2021-08-04 19:15 ` [PATCH 06/11] ARC: switch to generic bitops Vineet Gupta
2021-08-04 19:15 ` [PATCH 07/11] ARC: bitops: fls/ffs to take int (vs long) per asm-generic defines Vineet Gupta
2021-08-04 19:15 ` [PATCH 08/11] ARC: xchg: !LLSC: remove UP micro-optimization/hack Vineet Gupta
2021-08-04 19:15 ` [PATCH 09/11] ARC: cmpxchg/xchg: rewrite as macros to make type safe Vineet Gupta
2021-08-04 19:15 ` [PATCH 10/11] ARC: cmpxchg/xchg: implement relaxed variants (LLSC config only) Vineet Gupta
2021-08-04 19:15 ` [PATCH 11/11] ARC: atomic_cmpxchg/atomic_xchg: implement relaxed variants Vineet Gupta
2021-08-05 9:02 ` [PATCH 00/11] ARC atomics update Peter Zijlstra
2021-08-05 16:18 ` Vineet Gupta
2021-08-05 17:04 ` Peter Zijlstra [this message]
2021-08-05 19:14 ` [RFC] bitops/non-atomic: make @nr unsigned to avoid any DIV Vineet Gupta
2021-08-06 13:42 ` Will Deacon
2021-08-06 19:02 ` Vineet Gupta
2021-08-06 8:41 ` [PATCH 00/11] ARC atomics update Will Deacon
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