From: "Arnd Bergmann" <arnd@arndb.de>
To: "Mark Rutland" <mark.rutland@arm.com>,
"Peter Zijlstra" <peterz@infradead.org>
Cc: "Boqun Feng" <boqun.feng@gmail.com>,
"Linus Torvalds" <torvalds@linux-foundation.org>,
"Jonathan Corbet" <corbet@lwn.net>,
"Will Deacon" <will@kernel.org>,
"Catalin Marinas" <catalin.marinas@arm.com>,
dennis@kernel.org, "Tejun Heo" <tj@kernel.org>,
"Christoph Lameter" <cl@linux.com>,
"Heiko Carstens" <hca@linux.ibm.com>,
gor@linux.ibm.com, "Alexander Gordeev" <agordeev@linux.ibm.com>,
borntraeger@linux.ibm.com, svens@linux.ibm.com,
"Herbert Xu" <herbert@gondor.apana.org.au>,
"David S . Miller" <davem@davemloft.net>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"Borislav Petkov" <bp@alien8.de>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
joro@8bytes.org, suravee.suthikulpanit@amd.com,
"Robin Murphy" <robin.murphy@arm.com>,
dwmw2@infradead.org, baolu.lu@linux.intel.com,
"Pekka Enberg" <penberg@kernel.org>,
"David Rientjes" <rientjes@google.com>,
"Joonsoo Kim" <iamjoonsoo.kim@lge.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Vlastimil Babka" <vbabka@suse.cz>,
"Roman Gushchin" <roman.gushchin@linux.dev>,
"Hyeonggon Yoo" <42.hyeyoo@gmail.com>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, linux-s390@vger.kernel.org,
linux-crypto@vger.kernel.org, iommu@lists.linux.dev,
Linux-Arch <linux-arch@vger.kernel.org>
Subject: Re: [RFC][PATCH 05/12] arch: Introduce arch_{,try_}_cmpxchg128{,_local}()
Date: Tue, 03 Jan 2023 17:50:00 +0100 [thread overview]
Message-ID: <8fea3494-1d1f-4f64-b525-279152cf430b@app.fastmail.com> (raw)
In-Reply-To: <Y7RVkjDC3EjQUCzM@FVFF77S0Q05N>
On Tue, Jan 3, 2023, at 17:19, Mark Rutland wrote:
> On Tue, Jan 03, 2023 at 02:03:37PM +0000, Mark Rutland wrote:
>> On Tue, Jan 03, 2023 at 01:25:35PM +0000, Mark Rutland wrote:
>> > On Tue, Dec 20, 2022 at 12:08:16PM +0100, Peter Zijlstra wrote:
>> ... makes GCC much happier:
>
>> ... I'll go check whether clang is happy with that, and how far back that can
>> go, otherwise we'll need to blat the high half with a separate constaint that
>> (ideally) doesn't end up allocating a pointless address register.
>
> Hmm... from the commit history it looks like GCC prior to 5.1 might not be
> happy with that, but that *might* just be if we actually do arithmetic on the
> value, and we might be ok just using it for memroy effects. I can't currently
> get such an old GCC to run on my machines so I haven't been able to check.
gcc-5.1 is the oldest (barely) supported compiler, the minimum was
last raised from gcc-4.9 in linux-5.15. If only gcc-4.9 and older are
affected, we're good on mainline but may still want a fix for stable
kernels.
I checked that the cross-compiler binaries from [1] still work, but I noticed
that this version is missing the native aarch64-to-aarch64 compiler (x86 to
aarch64 and vice versa are there), and you need to install libmpfr4 [2]
as a dependency. The newer compilers (6.5.0 and up) don't have these problems.
Arnd
[1] https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/arm64/5.5.0/
[2] http://ftp.uk.debian.org/debian/pool/main/m/mpfr4/libmpfr4_3.1.5-1_arm64.deb
next prev parent reply other threads:[~2023-01-03 16:51 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-19 15:35 [RFC][PATCH 00/12] Introduce cmpxchg128() -- aka. the demise of cmpxchg_double() Peter Zijlstra
2022-12-19 15:35 ` [RFC][PATCH 01/12] crypto: Remove u128 usage Peter Zijlstra
2022-12-19 15:56 ` Jason A. Donenfeld
2022-12-19 17:00 ` Peter Zijlstra
2022-12-19 17:03 ` Jason A. Donenfeld
2022-12-20 3:50 ` Herbert Xu
2022-12-20 4:11 ` H. Peter Anvin
2022-12-20 4:15 ` Herbert Xu
2022-12-19 15:35 ` [RFC][PATCH 02/12] crypto/ghash-clmulni: Use (struct) be128 Peter Zijlstra
2022-12-20 5:45 ` Eric Biggers
2022-12-19 15:35 ` [RFC][PATCH 03/12] cyrpto/b128ops: Remove struct u128 Peter Zijlstra
2022-12-20 5:52 ` Eric Biggers
2022-12-19 15:35 ` [RFC][PATCH 04/12] types: Introduce [us]128 Peter Zijlstra
2022-12-29 8:30 ` Pavel Machek
2022-12-19 15:35 ` [RFC][PATCH 05/12] arch: Introduce arch_{,try_}_cmpxchg128{,_local}() Peter Zijlstra
2022-12-19 20:07 ` Boqun Feng
2022-12-20 11:08 ` Peter Zijlstra
2022-12-20 14:31 ` Linus Torvalds
2022-12-20 15:09 ` Peter Zijlstra
2023-01-03 13:25 ` Mark Rutland
2023-01-03 14:03 ` Mark Rutland
2023-01-03 16:19 ` Mark Rutland
2023-01-03 16:50 ` Arnd Bergmann [this message]
2023-01-04 11:36 ` Mark Rutland
2023-01-04 13:55 ` Mark Rutland
2022-12-22 1:25 ` Boqun Feng
2022-12-22 13:16 ` Peter Zijlstra
2023-01-03 17:12 ` Heiko Carstens
2023-01-09 18:50 ` Mark Rutland
2023-01-12 10:35 ` Peter Zijlstra
2022-12-19 15:35 ` [RFC][PATCH 06/12] instrumentation: Wire up cmpxchg128() Peter Zijlstra
2022-12-19 15:35 ` [RFC][PATCH 07/12] percpu: Wire up cmpxchg128 Peter Zijlstra
2022-12-29 13:36 ` Arnd Bergmann
2023-01-04 12:09 ` Heiko Carstens
2023-01-09 16:29 ` Peter Zijlstra
2022-12-19 15:35 ` [RFC][PATCH 08/12] s390: Replace cmpxchg_double() with cmpxchg128() Peter Zijlstra
2023-01-10 7:23 ` Heiko Carstens
2023-01-10 8:32 ` Peter Zijlstra
2023-01-10 11:27 ` Mark Rutland
2023-01-10 11:46 ` Heiko Carstens
2023-01-12 11:12 ` Alexander Gordeev
2022-12-19 15:35 ` [RFC][PATCH 09/12] x86,amd_iommu: Replace cmpxchg_double() Peter Zijlstra
2022-12-19 16:47 ` Niklas Schnelle
2022-12-28 8:40 ` Vasant Hegde
2022-12-19 15:35 ` [RFC][PATCH 10/12] x86,intel_iommu: " Peter Zijlstra
2022-12-19 15:35 ` [RFC][PATCH 11/12] slub: " Peter Zijlstra
2023-01-03 15:58 ` Vlastimil Babka
2023-01-03 17:16 ` Heiko Carstens
2023-01-03 19:08 ` Linus Torvalds
2023-01-04 12:07 ` Heiko Carstens
2023-01-09 16:28 ` Peter Zijlstra
2023-01-09 22:02 ` Linus Torvalds
2023-01-09 22:22 ` H. Peter Anvin
2023-01-10 2:09 ` H. Peter Anvin
2023-01-10 10:28 ` Peter Zijlstra
2022-12-19 15:35 ` [RFC][PATCH 12/12] arch: Remove cmpxchg_double Peter Zijlstra
2022-12-22 1:21 ` [RFC][PATCH 00/12] Introduce cmpxchg128() -- aka. the demise of cmpxchg_double() Boqun Feng
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