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[107.220.129.194]) by smtp.gmail.com with ESMTPSA id 00721157ae682-85e68ae126bsm79282297b3.9.2026.09.01.08.51.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Sep 2026 08:51:17 -0700 (PDT) From: Matt Turner To: linux-alpha@vger.kernel.org, richard.henderson@linaro.org Cc: linmag7@gmail.com, linux-kernel@vger.kernel.org Subject: [PATCH 11/24] alpha: select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE Date: Tue, 1 Sep 2026 11:50:24 -0400 Message-ID: X-Mailer: git-send-email 2.54.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Alpha has a clean split between user and kernel address spaces: user space occupies 0x0000000000000000-0x000003ffffffffff (TASK_SIZE), while kernel space uses KSEG and vmalloc regions near the top of the 64-bit address space. These are strictly non-overlapping. This enables optimizations in BPF and tracing that can skip address range checks when user and kernel pointers are distinguishable by address alone. Assisted-by: Claude:claude-opus-4-6 Signed-off-by: Matt Turner --- arch/alpha/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git ./arch/alpha/Kconfig ./arch/alpha/Kconfig index 6ccd03768083..2ae514bea4cf 100644 --- ./arch/alpha/Kconfig +++ ./arch/alpha/Kconfig @@ -7,6 +7,7 @@ config ALPHA select ARCH_HAS_DMA_OPS if PCI select ARCH_HAS_FAST_MULTIPLIER select ARCH_HAS_GCOV_PROFILE_ALL + select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE select ARCH_HAS_UBSAN select ARCH_MIGHT_HAVE_PC_PARPORT select ARCH_MIGHT_HAVE_PC_SERIO -- 2.54.0