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[94.254.104.176]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-59e5f5b222esm5435943e87.80.2026.02.19.09.00.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Feb 2026 09:00:31 -0800 (PST) From: Magnus Lindholm To: richard.henderson@linaro.org, mattst88@gmail.com, glaubitz@physik.fu-berlin.de, macro@orcam.me.uk, macro@redhat.com, mcree@orcon.net.nz, ink@unseen.parts, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org Cc: Magnus Lindholm Subject: [PATCH 0/1] Add support for HAVE_ARCH_JUMP_LABEL Date: Thu, 19 Feb 2026 17:58:31 +0100 Message-ID: <20260219170013.15884-1-linmag7@gmail.com> X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This patch adds jump label (static key) support for Alpha. Testing and verification were performed on an UP2000+ system. Verification steps: - Confirmed __jump_table section is present at runtime via /proc/kallsyms and contains a non-zero number of entries. - Instrumented arch_jump_label_transform() to log patch operations and verified instruction sites toggle between: NOP (bis $31,$31,$31, 0x47ff041f) BR (br $31,target) - Added temporary instrumentation in arch_jump_label_transform() to log old/new instruction values at each patch site, and used a Python script to validate correct NOP/BR transitions and branch encoding, confirming functional runtime patching. Instruction stream synchronization uses imb()/smp_imb() via flush_icache_range(), and runtime behavior confirms correct I-cache coherency. The system remained stable throughout all testing. Magnus Lindholm (1): alpha: Add support for HAVE_ARCH_JUMP_LABEL arch/alpha/Kconfig | 1 + arch/alpha/include/asm/jump_label.h | 66 +++++++++++++++++++++++ arch/alpha/kernel/Makefile | 1 + arch/alpha/kernel/jump_label.c | 81 +++++++++++++++++++++++++++++ 4 files changed, 149 insertions(+) create mode 100644 arch/alpha/include/asm/jump_label.h create mode 100644 arch/alpha/kernel/jump_label.c -- 2.52.0