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Peter Anvin" , Dennis Zhou , Tejun Heo , "Peter Zijlstra (Intel)" Subject: Re: [PATCH RESEND 1/2] x86/locking: Use ALT_OUTPUT_SP() for percpu_{,try_}cmpxchg{64,128}_op() In-Reply-To: Message-ID: References: <20250213191457.12377-1-ubizjak@gmail.com> <04adffd9-2900-4cdb-a557-1c486a87b522@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Rspam-User: X-Rspamd-Queue-Id: 8391D40012 X-Stat-Signature: nmtx1pudg9z9foz58qqnt5cz9cn8xsq1 X-Rspamd-Server: rspam03 X-HE-Tag: 1739557329-236404 X-HE-Meta: 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 Z91NXMuM vS01B3tvrOu6IyONQlP0dLbI1a+LzdRDuXx1PkpNB5wSZO6IFVN1VePHdGwbQGp84yVKmQojrXaLtLktp/vjd0JX2QFX+QxZ+juwkrBeYeG+knALJVGGCibIj/tTxMiJ7nQ5Lc3QgkOAsjSLyYsu3oJzP+BQuVdQC724sHweKfkiFVy9bpJPLWOqQpRyn5HdOavDyVyOJLKqHpYvHMrD1bmOvUclar+2TMrqjdAaopWqmS1SKWyOkb0sh71F3yyrsQVMOs69NUiy8FE6JxQQxLubsYIOZl7qRNRKihxZuASyDa2U= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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.