From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) (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 B7C1D1339A4; Fri, 9 Jan 2026 19:47:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=216.40.44.10 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767988041; cv=none; b=CAKEyLhRNDZ6E6T7PUhwjstaduuZECaEQg5osRgF41p0qxqXJ6DonszMtckNAu4MoRzSHWiKyAesdNn6CW83ORcidvRZwkjVrB9AynGYIGP4cywGXgvOwQAP+172ncwAN/7sOZOYe/CEFcaceeTj3KaHAy++bohhBw0QV2GyeeI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767988041; c=relaxed/simple; bh=3+G9HPXvnZjQghjiy8rA3xjq3Z2FEovFHz4a2z2sNH4=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=KByP+2ZJI05XdtsOKrSbPAVBUN5XoOho1fi6IJ/tcHg5kujYl+YzJsgI4Kk4fV9wE+1jbrbhGI2KF4pJ8msorP2jSEBHXnSIp4dy0oe7FrsGYK3q765DetcOlA0dESsqr6zvuR9So0oLy3ZgAyJZFnKZl4NeYlB2iSMBplu40v4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=goodmis.org; spf=pass smtp.mailfrom=goodmis.org; arc=none smtp.client-ip=216.40.44.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=goodmis.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=goodmis.org Received: from omf14.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 78E1213BED1; Fri, 9 Jan 2026 19:47:17 +0000 (UTC) Received: from [HIDDEN] (Authenticated sender: rostedt@goodmis.org) by omf14.hostedemail.com (Postfix) with ESMTPA id B7B0330; Fri, 9 Jan 2026 19:47:14 +0000 (UTC) Date: Fri, 9 Jan 2026 14:47:46 -0500 From: Steven Rostedt To: Will Deacon Cc: Breno Leitao , Catalin Marinas , Mark Rutland , Laura Abbott , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Masami Hiramatsu , puranjay@kernel.org, usamaarif642@gmail.com, kernel-team@meta.com, stable@vger.kernel.org Subject: Re: [PATCH] arm64/mm: Fix annotated branch unbootable kernel Message-ID: <20260109144746.4b86aff0@gandalf.local.home> In-Reply-To: References: <20251231-annotated-v1-1-9db1c0d03062@debian.org> X-Mailer: Claws Mail 3.20.0git84 (GTK+ 2.24.33; x86_64-pc-linux-gnu) 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=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspamout07 X-Rspamd-Queue-Id: B7B0330 X-Stat-Signature: y1irfeaeo9r3qazg5i1ufgoowtmksn5x X-Session-Marker: 726F737465647440676F6F646D69732E6F7267 X-Session-ID: U2FsdGVkX18aQfYKwLFjc+j1fBAjUkFY2tQx54zt9Ag= X-HE-Tag: 1767988034-189395 X-HE-Meta: U2FsdGVkX18aSF6HsSAMAz6VNgb0vhA/XykPHWKINq6EKVrPtdLYvWkca/CTYzPz962OC0FHShZH6YI8a5V0BZu08PDbuO6zi2PCdYYg3XkjdEg4yGu9sG+ItQzMQ+COZxGcRyEppbC4oBmsakrHKsKgb0BzEOJ2gNlytKlsKvxTOARvTNCwdpr02i3oViBFBEtXUe536R3LDv7lHSA8qchlGSqV5PU74Wi5l6CwzZQdU1+6T1SQMz4F8FM9u3YJ0NcVkEoRm/Y8viZObsnvBSXnn9u10mjEw6ADZCArqJ+petiaq83Sy6DqJXPViXpfCEnAZ9F/2WTn67tnRftG9A/IbPmiQ49D On Mon, 5 Jan 2026 21:15:40 +0000 Will Deacon wrote: > > Another approach is to disable profiling on all arch/arm64 code, similarly to > > x86, where DISABLE_BRANCH_PROFILING is called for all arch/x86 code. See > > commit 2cbb20b008dba ("tracing: Disable branch profiling in noinstr > > code"). > > Yes, let's start with arch/arm64/. We know that's safe and then if > somebody wants to make it finer-grained, it's on them to figure out a > way to do it without playing whack-a-mole. OK, so by adding -DDISABLE_BRANCH_PROFILING to the Makefile configs and for the files that were audited, could be opt-in? CFLAGS_REMOVE_.o = -DDISABLE_BRANCH_PROFILING And add that for each file that has been fully audited? -- Steve