Re: [RFC] ftrace: Add support to keep some functions out of ftrace

[Steven Rostedt]

On Thu, 18 Aug 2022 14:00:21 -0700
Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx> wrote:

> > #ifdef CONFIG_X86
> > # define NON_MCOUNT_PATCHABLE KEEP(*(__patchable_function_entries))
> > # define MCOUNT_PATCHABLE
> > #else
> > # define NON_MCOUNT_PATCHABLE
> > # define MCOUNT_PATCHABLE  KEEP(*(__patchable_function_entries))
> > #endif
> >
> >   #define MCOUNT_REC()    . = ALIGN(8);     \
> >     __start_mcount_loc = .;                 \
> >     KEEP(*(__mcount_loc))                   \
> >     MCOUNT_PATCHABLE                        \
> >     __stop_mcount_loc = .;                  \
> >     NON_MCOUNT_PATCHABLE                    \
> >    ...
> >
> > ??  
> 
> That's what more or less Peter's patch is doing:

Heh.

> Here it is again for reference:
> https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?id=8d075bdf11193f1d276bf19fa56b4b8dfe24df9e

Thanks, I missed seeing this.

-- Steve