Re: [PATCH] arm64/mm: Fix annotated branch unbootable kernel

Hello Steven,

On Fri, Jan 09, 2026 at 02:50:22PM -0500, Steven Rostedt wrote:

[ Resending with my kernel.org email, as I received a bunch of messages from gmail saying it's blocking me :-p ]

On Mon, 5 Jan 2026 21:15:40 +0000
Will Deacon [off-list ref] wrote:

quoted

quoted

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?

How to do the audit in this case? I suppose we want to disable branch
profiling for files that have any function that would eventually call
noinstr functions, right?