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ANDROID: kbuild: fix dynamic ftrace with clang LTO

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With CONFIG_LTO_CLANG enabled, LLVM IR won't be compiled into object
files until modpost_link. This change postpones calls to recordmcount
until after this step.

In order to exclude ftrace_process_locs from inspection, we add a new
code section .text..ftrace, which we tell recordmcount to ignore, and
a __norecordmcount attribute for moving functions to this section.

Bug: 145210207
Change-Id: Ib77f7c431fce54243c46d584b55761ed2342965c
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
This commit is contained in:
Sami Tolvanen 2019-05-08 13:53:41 -07:00
commit d671af5fd7
9 changed files with 52 additions and 5 deletions
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4
scripts/Makefile.modfinal
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@ -41,6 +41,10 @@ ifdef CONFIG_LTO_CLANG
echo -T $(@:.ko=.o.symversions)) \
-o $@ --whole-archive $(filter %.o, $^); \
$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
ifdef CONFIG_FTRACE_MCOUNT_RECORD
cmd_ld_ko_o += ; $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) $@
endif
else
cmd_ld_ko_o = \
$(LD) -r $(KBUILD_LDFLAGS) \