On Thu, Sep 3, 2020 at 2:51 PM Kees Cook [off-list ref] wrote:

On Thu, Sep 03, 2020 at 01:30:30PM -0700, Sami Tolvanen wrote:

quoted

From: Peter Zijlstra <peterz@infradead.org>

Add the --mcount option for generating __mcount_loc sections
needed for dynamic ftrace. Using this pass requires the kernel to
be compiled with -mfentry and CC_USING_NOP_MCOUNT to be defined
in Makefile.

Link: https://lore.kernel.org/lkml/20200625200235.GQ4781@hirez.programming.kicks-ass.net/ (local)
Signed-off-by: Peter Zijlstra <peterz@infradead.org>

Hmm, I'm not sure why this hasn't gotten picked up yet. Is this expected
to go through -tip or something else?

Note that I picked up this patch from Peter's original email, to which
I included a link in the commit message, but it wasn't officially
submitted as a patch. However, the previous discussion seems to have
died, so I included the patch in this series, as it cleanly solves the
problem of whitelisting non-call references to __fentry__. I was
hoping for Peter and Steven to comment on how they prefer to proceed
here.

Sami

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