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FROMLIST: x86, build: use objtool mcount

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Select HAVE_OBJTOOL_MCOUNT if STACK_VALIDATION is selected to use
objtool to generate __mcount_loc sections for dynamic ftrace with
Clang and gcc <5 (later versions of gcc use -mrecord-mcount).

Bug: 145210207
Change-Id: I73f2ead54f21d5f32346c33071fce2d2d87f39fa
Link: https://lore.kernel.org/lkml/20201013003203.4168817-7-samitolvanen@google.com/
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Sami Tolvanen 2020-08-06 15:15:02 -07:00
parent 195bcf1c70
commit 78a2549ecb
1 changed files with 1 additions and 0 deletions
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1
arch/x86/Kconfig
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@ -164,6 +164,7 @@ config X86
select HAVE_CMPXCHG_LOCAL
select HAVE_CONTEXT_TRACKING if X86_64
select HAVE_C_RECORDMCOUNT
select HAVE_OBJTOOL_MCOUNT if STACK_VALIDATION
select HAVE_DEBUG_KMEMLEAK
select HAVE_DMA_CONTIGUOUS
select HAVE_DYNAMIC_FTRACE