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| author | Sathvika Vasireddy <sv@linux.ibm.com> | 2022-11-14 23:27:49 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-11-18 19:00:16 +1100 |
| commit | 280981d6994e0700abd36647b141e73059851e66 (patch) | |
| tree | 9b1d8c765093a419269935e528e9e695f6e87e30 /scripts/Makefile.lib | |
| parent | 86ea7f361537f825a699e86fdc9e49be19f128d1 (diff) | |
| download | lwn-280981d6994e0700abd36647b141e73059851e66.tar.gz lwn-280981d6994e0700abd36647b141e73059851e66.zip | |
objtool: Add --mnop as an option to --mcount
Some architectures (powerpc) may not support ftrace locations being nop'ed
out at build time. Introduce CONFIG_HAVE_OBJTOOL_NOP_MCOUNT for objtool, as
a means for architectures to enable nop'ing of ftrace locations. Add --mnop
as an option to objtool --mcount, to indicate support for the same.
Also, make sure that --mnop can be passed as an option to objtool only when
--mcount is passed.
Tested-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Reviewed-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Sathvika Vasireddy <sv@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221114175754.1131267-12-sv@linux.ibm.com
Diffstat (limited to 'scripts/Makefile.lib')
| -rw-r--r-- | scripts/Makefile.lib | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib index 3aa384cec76b..658f541c2782 100644 --- a/scripts/Makefile.lib +++ b/scripts/Makefile.lib @@ -256,6 +256,9 @@ objtool-args-$(CONFIG_HAVE_JUMP_LABEL_HACK) += --hacks=jump_label objtool-args-$(CONFIG_HAVE_NOINSTR_HACK) += --hacks=noinstr objtool-args-$(CONFIG_X86_KERNEL_IBT) += --ibt objtool-args-$(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL) += --mcount +ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL +objtool-args-$(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT) += --mnop +endif objtool-args-$(CONFIG_UNWINDER_ORC) += --orc objtool-args-$(CONFIG_RETPOLINE) += --retpoline objtool-args-$(CONFIG_RETHUNK) += --rethunk |