On Sun, 13 Jul 2025 10:17:30 +0300
Mike Rapoport [off-list ref] wrote:

From: "Mike Rapoport (Microsoft)" <rppt@kernel.org>

For the most part ftrace uses text poking and can handle ROX memory.
The only place that requires writable memory is create_trampoline() that
updates the allocated memory and in the end makes it ROX.

Use execmem_alloc_rw() in x86::ftrace::alloc_tramp() and enable ROX cache
for EXECMEM_FTRACE when configuration and CPU features allow that.

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>

-- Steve