From: "Arnd Bergmann" <arnd@arndb.de>
To: "Peter Zijlstra" <peterz@infradead.org>,
"Linus Torvalds" <torvalds@linux-foundation.org>
Cc: "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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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>,
"Helge Deller" <deller@gmx.de>,
linux-parisc@vger.kernel.org
Subject: Re: [PATCH 07/12] percpu: #ifndef __SIZEOF_INT128__
Date: Wed, 31 May 2023 16:21:22 +0200 [thread overview]
Message-ID: <70a69deb-7ad4-45b2-8e13-34955594a7ce@app.fastmail.com> (raw)
In-Reply-To: <20230531132323.722039569@infradead.org>
On Wed, May 31, 2023, at 15:08, Peter Zijlstra wrote:
> Some 64bit architectures do not advertise __SIZEOF_INT128__ on all
> supported compiler versions. Notably the HPPA64 only started doing
> with GCC-11.
I checked the other compilers to be sure that anything else
we support (gcc-5.1 and up) across all 64-bit architectures
does support int128.
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.
> +#ifndef __SIZEOF_INT128__
> +#define raw_cpu_generic_try_cmpxchg_memcmp(pcp, ovalp, nval) \
> +({ \
> + typeof(pcp) *__p = raw_cpu_ptr(&(pcp)); \
> + typeof(pcp) __val = *__p, __old = *(ovalp); \
> + bool __ret; \
> + if (!__builtin_memcmp(&__val, &__old, sizeof(pcp))) { \
> + *__p = nval; \
> + __ret = true; \
> + } else { \
> + *(ovalp) = __val; \
> + __ret = false; \
> + } \
> + __ret; \
> +})
> +
> +#define raw_cpu_generic_cmpxchg_memcmp(pcp, oval, nval) \
> +({ \
> + typeof(pcp) __old = (oval); \
> + raw_cpu_generic_try_cmpxchg_memcpy(pcp, &__old, nval); \
> + __old; \
> +})
Instead of having this in include/asm-generic under
!__SIZEOF_INT128__, could you just move this into the parisc
files with a compiler version check?
Arnd
next prev parent reply other threads:[~2023-05-31 14:22 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 [this message]
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
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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