From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B2169242D72 for ; Sun, 1 Mar 2026 01:19:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772327971; cv=none; b=hB6yjT9KwvGO/UKntX4JAs7aCWCcF6dSS9TXrzOmyCmW631dCHZ7ve7TURx+EC3e13L107z925xXAfRZCVt7zVn3gEuR8pjquaBo5KvGBEGKcLtmKxEhO9Yr9VDWb0IZ5ObWlSE24Mew/R9VN/fHDNmCIhz/7k+hxDAq1vZIHeI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772327971; c=relaxed/simple; bh=2M9vkXXL3bQw/LBh+BIy1+CbLyIf6zojcnCf0sXqJQU=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=V7/tULIn9IFa3XSiYKPgtG+3TzmIr4RfNK6Wr/m139uHA+rIK2o+oMBU2TaH54QCexE/zlsDDi6pNm3ytYlPzeku3+giAbPdw2xa3d5+Ghe845mTI/BrhWyPH2otAoxCxGvDAnPECivkgZivuj8gjEul5W9ozNa2xY/+V+XskQ8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=vCgmXqeN; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="vCgmXqeN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 080C4C19421; Sun, 1 Mar 2026 01:19:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772327971; bh=2M9vkXXL3bQw/LBh+BIy1+CbLyIf6zojcnCf0sXqJQU=; h=From:To:Cc:Subject:Date:From; b=vCgmXqeN81XhcUvFAPAZq700xMMWriIE8QqCyq4o03vNo4Wg7XE+Kb1msMIUrOt4p wGzU9cK8M2pCIIsVkiTEAFFIsH9EiFz/BCz0b0XYP0+j06HXQdBL3K1lobEGmpA2as tVkY124pYgeLUxIRNOHvMusxbhEvXBvmKcL5YQSXDkcrOgzSkCwOHInXk2FeAI34gg wlVs4cxEp8yFGjMqNYcrsO9kQWos8b/x5KFacUQW4seFdAC6kJtvQ2ioHH6sbBaQzP FiA8Jfay6jvUFna447R9GxPIYaE9Zi2RoBwZhBRGZ83XobuYaiVH+7huK9/sYdx6Fd /kyEkA603U95g== From: Sasha Levin To: stable@vger.kernel.org, leitao@debian.org Cc: Mark Rutland , Will Deacon , linux-arm-kernel@lists.infradead.org Subject: FAILED: Patch "arm64: Disable branch profiling for all arm64 code" failed to apply to 6.12-stable tree Date: Sat, 28 Feb 2026 20:19:29 -0500 Message-ID: <20260301011929.1674573-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Hint: ignore X-stable: review Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.12-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From f22c81bebf8bda6e54dc132df0ed54f6bf8756f9 Mon Sep 17 00:00:00 2001 From: Breno Leitao Date: Tue, 6 Jan 2026 02:16:35 -0800 Subject: [PATCH] arm64: Disable branch profiling for all arm64 code 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 Signed-off-by: Breno Leitao Acked-by: Mark Rutland Signed-off-by: Will Deacon --- arch/arm64/Kbuild | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm64/Kbuild b/arch/arm64/Kbuild index 5bfbf7d79c99b..d876bc0e54211 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/ -- 2.51.0