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Tue, 06 Jan 2026 02:16:47 -0800 (PST) From: Breno Leitao Date: Tue, 06 Jan 2026 02:16:35 -0800 Subject: [PATCH v2] arm64: Disable branch profiling for all arm64 code Precedence: bulk X-Mailing-List: linux-trace-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: <20260106-annotated-v2-1-fb7600ebd47f@debian.org> X-B4-Tracking: v=1; b=H4sIAAPhXGkC/yXMwQqFIBAF0F8Z7jqhlAj8lWhhOtW0sFCLB9G/P 6rl2ZwLmZNwhqULiU/JskVY0hXBLy7OrCTAEnSt20abRrkYt+IKB9W1gc1kjA/diIqwJ57k917 98Dkf48q+PAHu+w/4tl4nbQAAAA== X-Change-ID: 20251231-annotated-75de3f33cd7b To: Catalin Marinas , Will Deacon , Mark Rutland , Laura Abbott Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Steven Rostedt , Masami Hiramatsu , kernel-team@meta.com, puranjay@kernel.org, stable@vger.kernel.org, Breno Leitao X-Mailer: b4 0.15-dev-47773 X-Developer-Signature: v=1; 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a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D The arm64 kernel doesn't boot with annotated branches (PROFILE_ANNOTATED_BRANCHES) enabled and CONFIG_DEBUG_VIRTUAL together. Bisecting it, I found that disabling branch profiling in arch/arm64/mm solved the problem. Narrowing down a bit further, I found that physaddr.c is the file that needs to have branch profiling disabled to get the machine to boot. I suspect that it might invoke some ftrace helper very early in the boot process and ftrace is still not enabled(!?). Rather than playing whack-a-mole with individual files, disable branch profiling for the entire arch/arm64 tree, similar to what x86 already does in arch/x86/Kbuild. Cc: stable@vger.kernel.org Fixes: ec6d06efb0bac ("arm64: Add support for CONFIG_DEBUG_VIRTUAL") Signed-off-by: Breno Leitao --- Changes in v2: - Expand the scope to arch/arm64 instead of just physaddr.c - Link to v1: https://lore.kernel.org/all/20251231-annotated-v1-1-9db1c0d03062@debian.org/ --- arch/arm64/Kbuild | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm64/Kbuild b/arch/arm64/Kbuild index 5bfbf7d79c99..d876bc0e5421 100644 --- a/arch/arm64/Kbuild +++ b/arch/arm64/Kbuild @@ -1,4 +1,8 @@ # SPDX-License-Identifier: GPL-2.0-only + +# Branch profiling isn't noinstr-safe +subdir-ccflags-$(CONFIG_TRACE_BRANCH_PROFILING) += -DDISABLE_BRANCH_PROFILING + obj-y += kernel/ mm/ net/ obj-$(CONFIG_KVM) += kvm/ obj-$(CONFIG_XEN) += xen/ --- base-commit: c8ebd433459bcbf068682b09544e830acd7ed222 change-id: 20251231-annotated-75de3f33cd7b Best regards, -- Breno Leitao