Re: [PATCH v4 11/16] objtool: Add --mnop as an option to --mcount
From: Josh Poimboeuf <jpoimboe@kernel.org>
Date: 2022-10-11 20:33:41
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On Mon, Oct 10, 2022 at 05:07:46PM +0530, Naveen N. Rao wrote:
quoted hunk ↗ jump to hunk
quoted
+++ b/scripts/Makefile.lib@@ -234,6 +234,7 @@ objtool_args = \ $(if $(CONFIG_HAVE_NOINSTR_HACK), --hacks=noinstr) \ $(if $(CONFIG_X86_KERNEL_IBT), --ibt) \ $(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount) \ + $(if $(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT), --mnop) \This still won't help: for instance, if CONFIG_FTRACE itself is disabled. I think we should make this depend on CONFIG_FTRACE_MCOUNT_USE_OBJTOOL. The below change works for me:diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib index 54d2d6451bdacc..fd3f55a1fdb7bb 100644 --- a/scripts/Makefile.lib +++ b/scripts/Makefile.lib@@ -245,8 +245,8 @@ objtool_args = \ $(if $(CONFIG_HAVE_JUMP_LABEL_HACK), --hacks=jump_label) \ $(if $(CONFIG_HAVE_NOINSTR_HACK), --hacks=noinstr) \ $(if $(CONFIG_X86_KERNEL_IBT), --ibt) \ - $(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount) \ - $(if $(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT), --mnop) \ + $(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), \ + $(if $(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT), --mcount --mnop, --mcount)) \ $(if $(CONFIG_UNWINDER_ORC), --orc) \ $(if $(CONFIG_RETPOLINE), --retpoline) \ $(if $(CONFIG_RETHUNK), --rethunk) \
This has a new conflict, may need something like:
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib@@ -256,6 +256,9 @@ objtool-args-$(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