From: Sam James <sam@gentoo.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Helge Deller <deller@gmx.de>, Arnd Bergmann <arnd@arndb.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
Jonathan Corbet <corbet@lwn.net>, Will Deacon <will@kernel.org>,
Boqun Feng <boqun.feng@gmail.com>,
Mark Rutland <mark.rutland@arm.com>,
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, Sven Schnelle <svens@linux.ibm.com>,
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>,
Joerg Roedel <joro@8bytes.org>,
suravee.suthikulpanit@amd.com,
Robin Murphy <robin.murphy@arm.com>,
David Woodhouse <dwmw2@infradead.org>,
Baolu Lu <baolu.lu@linux.intel.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
"David S . Miller" <davem@davemloft.net>,
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,
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iommu@lists.linux.dev, Linux-Arch <linux-arch@vger.kernel.org>,
linux-crypto@vger.kernel.org,
Stephen Rothwell <sfr@canb.auug.org.au>,
Michael Ellerman <mpe@ellerman.id.au>,
"James E . J . Bottomley" <James.Bottomley@hansenpartnership.com>,
linux-parisc@vger.kernel.org,
John David Anglin <dave.anglin@bell.net>
Subject: Re: [PATCH v2 07/12] parisc/percpu: Work around the lack of __SIZEOF_INT128__
Date: Thu, 01 Jun 2023 22:08:44 +0100 [thread overview]
Message-ID: <87jzwmvqin.fsf@gentoo.org> (raw)
In-Reply-To: <20230601105021.GU4253@hirez.programming.kicks-ass.net>
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Peter Zijlstra <peterz@infradead.org> writes:
> On Thu, Jun 01, 2023 at 12:32:38PM +0200, Helge Deller wrote:
>> On 6/1/23 12:14, Peter Zijlstra wrote:
>> > On Wed, May 31, 2023 at 04:21:22PM +0200, Arnd Bergmann wrote:
>> >
>> > > It would be nice to have the hack more localized to parisc
>> > > and guarded with a CONFIG_GCC_VERSION check so we can kill
>> > > it off in the future, once we drop either gcc-10 or parisc
>> > > support.
>> >
>> > I vote for dropping parisc -- it's the only 64bit arch that doesn't have
>> > sane atomics.
>>
>> Of course I'm against dropping parisc.
>
> :-)
>
>> > Anyway, the below seems to work -- build tested with GCC-10.1
>>
>> I don't think we need to care about gcc-10 on parisc.
>> Debian and Gentoo are the only supported distributions, while Debian
>> requires gcc-12 to build > 6.x kernels, and I assume Gentoo uses at least
>> gcc-12 as well.
>>
>> So raising the gcc limit for parisc only (at least temporarily for now)
>> should be fine and your workaround below wouldn't be necessary, right?
>
> Correct, if you're willing to set minimum GCC version to 11 for parisc
> all is well and this patch can go play in the bit bucket.
It's fine for us in Gentoo, thanks!
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next prev parent reply other threads:[~2023-06-01 21:09 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-31 13:08 [PATCH 00/12] Introduce cmpxchg128() -- aka. the demise of cmpxchg_double() Peter Zijlstra
2023-05-31 13:08 ` [PATCH 01/12] cyrpto/b128ops: Remove struct u128 Peter Zijlstra
2023-05-31 13:08 ` [PATCH 02/12] types: Introduce [us]128 Peter Zijlstra
2023-05-31 13:08 ` [PATCH 03/12] arch: Introduce arch_{,try_}_cmpxchg128{,_local}() Peter Zijlstra
2023-05-31 13:08 ` [PATCH 04/12] instrumentation: Wire up cmpxchg128() Peter Zijlstra
2023-05-31 13:08 ` [PATCH 05/12] percpu: Add {raw,this}_cpu_try_cmpxchg() Peter Zijlstra
2023-06-09 16:10 ` [PATCH v2 5/12] " Konrad Dybcio
2023-06-09 16:13 ` Nathan Chancellor
2023-06-09 16:20 ` Konrad Dybcio
2023-05-31 13:08 ` [PATCH 06/12] percpu: Wire up cmpxchg128 Peter Zijlstra
2023-05-31 13:08 ` [PATCH 07/12] percpu: #ifndef __SIZEOF_INT128__ Peter Zijlstra
2023-05-31 14:21 ` Arnd Bergmann
2023-05-31 15:50 ` Peter Zijlstra
2023-06-01 10:14 ` [PATCH v2 07/12] parisc/percpu: Work around the lack of __SIZEOF_INT128__ Peter Zijlstra
2023-06-01 10:32 ` Helge Deller
2023-06-01 10:50 ` Peter Zijlstra
2023-06-01 21:08 ` Sam James [this message]
2023-06-01 13:29 ` Linus Torvalds
2023-06-01 17:38 ` Masahiro Yamada
2023-06-02 14:39 ` Peter Zijlstra
2023-06-02 14:50 ` Mark Rutland
2023-06-02 16:09 ` Linus Torvalds
2023-06-02 17:00 ` H. Peter Anvin
2023-06-02 19:10 ` Peter Zijlstra
2023-06-02 19:20 ` H. Peter Anvin
2023-06-02 19:40 ` Peter Zijlstra
2023-06-02 19:57 ` Linus Torvalds
2023-06-02 20:42 ` Helge Deller
2023-05-31 13:08 ` [PATCH 08/12] x86,amd_iommu: Replace cmpxchg_double() Peter Zijlstra
2023-05-31 13:08 ` [PATCH 09/12] x86,intel_iommu: " Peter Zijlstra
2023-05-31 13:08 ` [PATCH 10/12] slub: " Peter Zijlstra
2023-05-31 13:08 ` [PATCH 11/12] arch: Remove cmpxchg_double Peter Zijlstra
2023-05-31 13:08 ` [PATCH 12/12] s390/cpum_sf: Convert to cmpxchg128() Peter Zijlstra
2023-05-31 14:47 ` [PATCH 00/12] Introduce cmpxchg128() -- aka. the demise of cmpxchg_double() Mark Rutland
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