| Date | Wed, 24 Jun 2020 23:27:37 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 04/22] kbuild: lto: fix recordmcount |
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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 compiled with:
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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