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Date: Fri, 14 Feb 2025 10:22:08 -0800 (PST)
From: "Christoph Lameter (Ampere)" <cl@gentwo.org>
To: Uros Bizjak <ubizjak@gmail.com>
cc: Dave Hansen <dave.hansen@intel.com>, x86@kernel.org, linux-mm@kvack.org, 
    linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>, 
    Ingo Molnar <mingo@kernel.org>, Borislav Petkov <bp@alien8.de>, 
    Dave Hansen <dave.hansen@linux.intel.com>, 
    "H. Peter Anvin" <hpa@zytor.com>, Dennis Zhou <dennis@kernel.org>, 
    Tejun Heo <tj@kernel.org>, "Peter Zijlstra (Intel)" <peterz@infradead.org>
Subject: Re: [PATCH RESEND 1/2] x86/locking: Use ALT_OUTPUT_SP() for
 percpu_{,try_}cmpxchg{64,128}_op()
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Message-ID: <cf264b5f-be03-af53-3de3-a97051f9577e@gentwo.org>
References: <20250213191457.12377-1-ubizjak@gmail.com> <04adffd9-2900-4cdb-a557-1c486a87b522@intel.com> <CAFULd4YUSCBSJQ1F0Rn45bwTonQJb2_=c2sZZEGV7RfgHBAOJA@mail.gmail.com>
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On Thu, 13 Feb 2025, Uros Bizjak wrote:

> OTOH, all recent x86_64 processors support CMPXCHG128 insn, so the
> call alternative will be rarely used.

Do we still support processors without cmpxchg128? If not then lets just
drop the calls from the kernel.