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Mon, 07 Jul 2025 09:01:08 -0700 (PDT) Received: from localhost ([2a03:2880:20ff:8::]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-702c4cc765csm61512726d6.24.2025.07.07.09.01.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Jul 2025 09:01:07 -0700 (PDT) From: Breno Leitao Subject: [PATCH 0/8] arm64: set VMAP_STACK by default Date: Mon, 07 Jul 2025 09:01:00 -0700 Message-Id: <20250707-arm64_vmap-v1-0-8de98ca0f91c@debian.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIADzva2gC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDI1MDcwNz3cSiXDOT+LLcxALdtERzg6RE42TL5LQkJaCGgqLUtMwKsGHRsbW 1AI9YSptcAAAA X-Change-ID: 20250707-arm64_vmap-fa70ba3c9cfb To: Catalin Marinas , Will Deacon , Ard Biesheuvel Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org, Breno Leitao , leo.yan@arm.com, kernel-team@meta.com, mark.rutland@arm.com X-Mailer: b4 0.15-dev-42535 X-Developer-Signature: v=1; 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a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250707_090115_606166_2806AD3D X-CRM114-Status: UNSURE ( 9.62 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi all, This patchset select VMAP_STACK on arm64 by default, and cleans up the code by removing all associated CONFIG_VMAP_STACK conditionals. This is a suggestion from Will Deacon from another discussion[1]. With VMAP_STACK now always enabled on arm64, the code can be significantly simplified, reducing complexity and potential for misconfiguration. Overview of Changes * Remove all #ifdef CONFIG_VMAP_STACK and related runtime checks throughout the architecture codebase. * Replace runtime checks with build-time assertions where appropriate. Link: https://lore.kernel.org/all/aGfYL8eXjTA9puQr@willie-the-truck/ [1] Signed-off-by: Breno Leitao --- Breno Leitao (8): arm64: Enable VMAP_STACK support arm64: efi: Remove CONFIG_VMAP_STACK check arm64: Remove CONFIG_VMAP_STACK conditionals from THREAD_SHIFT and THREAD_ALIGN arm64: remove CONFIG_VMAP_STACK conditionals from irq stack setup arm64: remove CONFIG_VMAP_STACK conditionals from traps overflow stack arm64: remove CONFIG_VMAP_STACK checks from stacktrace overflow logic arm64: remove CONFIG_VMAP_STACK checks from SDEI stack handling arm64: remove CONFIG_VMAP_STACK checks from entry code arch/arm64/Kconfig | 1 + arch/arm64/include/asm/memory.h | 6 +----- arch/arm64/include/asm/stacktrace.h | 6 +----- arch/arm64/kernel/efi.c | 5 ----- arch/arm64/kernel/entry-common.c | 2 -- arch/arm64/kernel/entry.S | 6 ------ arch/arm64/kernel/irq.c | 13 ------------- arch/arm64/kernel/sdei.c | 8 ++------ arch/arm64/kernel/stacktrace.c | 4 +--- arch/arm64/kernel/traps.c | 3 --- 10 files changed, 6 insertions(+), 48 deletions(-) --- base-commit: 9dd1757493416310a5e71146a08bc228869f8dae change-id: 20250707-arm64_vmap-fa70ba3c9cfb Best regards, -- Breno Leitao