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Sat, 05 Sep 2026 12:29:39 -0700 (PDT) From: Matt Turner Date: Sat, 05 Sep 2026 15:29:28 -0400 Subject: [PATCH v2 07/22] alpha: select ARCH_HAS_FAST_MULTIPLIER Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260905-arch-kconfig-options-v2-v2-7-83e8245761a2@gmail.com> References: <20260905-arch-kconfig-options-v2-v2-0-83e8245761a2@gmail.com> In-Reply-To: <20260905-arch-kconfig-options-v2-v2-0-83e8245761a2@gmail.com> To: Richard Henderson , Magnus Lindholm , Kees Cook , Marco Elver , Andrey Konovalov , Andrey Ryabinin , Jonathan Corbet , Shuah Khan , Randy Dunlap Cc: linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, linux-hardening@vger.kernel.org, linux-doc@vger.kernel.org, Matt Turner X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=990; i=mattst88@gmail.com; h=from:subject:message-id; bh=d64vrkzV8SwOJMlfAMFEdEJjMT39PCBSfivQv0NFu/w=; b=owGbwMvMwCW25rVmCc8sv+mMp9WSGLLm5E52OS953f6VlMGdbfOOiZqUx+b8/qvsEHX00sZJp 28vXqD7v+MjC4MYF8NMMUWWuPWKLLPadiz1OS39C2YOKxPIEGmRBgYgYGHgy03MKzXSMdIz1TbU MwQydIziIXJ6DBqZxcWlqUW6aQVFDnn5JYklmfl5xXr5Bal5BekFemmZaSUZGflFxalAI/TyUkt MXR3djAwNTCwdLcycLBxNTZydnQyd3BwdnV2djCzNTQycLR1NXC3NGbg4BWCuMVRnZHhVdITDzN X1/ZZT7/jk5OsuOnjyCsousnkdKlJ+fmvWU05GhlWLgz6/ueSyxFBtt1aHXZf9g7iqWEbJAzp/n s9ceDK2hwUA X-Developer-Key: i=mattst88@gmail.com; a=openpgp; fpr=3BB639E56F861FA2E86505690FDD682D974CA72A All Alpha CPUs have hardware integer multiply (MULL/MULQ). EV4 and EV5 implement it in microcode; EV56 and later have fast single-cycle multiply. Since no EV4 system is likely to run a modern kernel, select this unconditionally to enable multiply-based fast paths in hweight and string routines. Assisted-by: Claude:claude-opus-4-6 Signed-off-by: Matt Turner Tested-by: Magnus Lindholm Reviewed-by: Magnus Lindholm --- arch/alpha/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig index d039b7135d18..2672971b83f3 100644 --- a/arch/alpha/Kconfig +++ b/arch/alpha/Kconfig @@ -7,6 +7,7 @@ config ALPHA select ARCH_32BIT_USTAT_F_TINODE select ARCH_HAS_CURRENT_STACK_POINTER select ARCH_HAS_DMA_OPS if PCI + select ARCH_HAS_FAST_MULTIPLIER select ARCH_HAS_GCOV_PROFILE_ALL select ARCH_HAS_UBSAN select ARCH_MIGHT_HAVE_PC_PARPORT -- 2.54.0