Re: [RFC PATCH bpf-next v3 1/2] ftrace: deprecate disabling via ftrace_enabled sysctl
Miroslav Benes <[email protected]>
| Newsgroups | org.kernel.vger.bpf,org.kernel.vger.linux-trace-kernel,org.kernel.vger.live-patching,org.kernel.vger.stable |
|---|---|
| Message-ID | <178757460647.29054.9328797950595292140.b4-review@b4> |
On Thu, 06 Aug 2026 11:29:59 -0400, Andrey Grodzovsky <[email protected]> wrote: > Writing 0 to kernel.ftrace_enabled has not reliably disabled ftrace > for years (FTRACE_OPS_FL_PERMANENT users already block it, and more > callers rely on ftrace always being on). Refuse the write instead of > leaving it in an inconsistent "disables some, not all" state: return > -EOPNOTSUPP and log a message. Reads and enabling (writing 1) are > unaffected. > > [...] Reviewed-by: Miroslav Benes <[email protected]> -- Miroslav