[PATCH 04/22] kbuild: lto: fix recordmcount
peterz at infradead.org
Wed Jun 24 17:27:37 EDT 2020
On Wed, Jun 24, 2020 at 01:31:42PM -0700, Sami Tolvanen wrote:
> With LTO, LLVM bitcode won't be compiled into native code until
> modpost_link. This change postpones calls to recordmcount until after
> this step.
> In order to exclude specific functions from inspection, we add a new
> code section .text..nomcount, which we tell recordmcount to ignore, and
> a __nomcount attribute for moving functions to this section.
I'm confused, you only add this to functions in ftrace itself, which is
KBUILD_CFLAGS = $(subst $(CC_FLAGS_FTRACE),,$(ORIG_CFLAGS))
and so should not have mcount/fentry sites anyway. So what's the point
of ignoring them further?
This Changelog does not explain.
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