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authorPeter Zijlstra <peterz@infradead.org>2018-01-16 12:24:06 +0300
committerIngo Molnar <mingo@kernel.org>2018-02-21 11:05:04 +0300
commitb5bc2231b8ad4387c9641f235ca0ad8cd300b6df (patch)
treea6ce9e09e9f1424f9506bf8b1ba375c88a044a76 /scripts
parent43a4525f80534530077683f6472d8971646b0ace (diff)
downloadlinux-b5bc2231b8ad4387c9641f235ca0ad8cd300b6df.tar.xz
objtool: Add retpoline validation
David requested a objtool validation pass for CONFIG_RETPOLINE=y enabled builds, where it validates no unannotated indirect jumps or calls are left. Add an additional .discard.retpoline_safe section to allow annotating the few indirect sites that are required and safe. Requested-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: David Woodhouse <dwmw@amazon.co.uk> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'scripts')
-rw-r--r--scripts/Makefile.build4
1 files changed, 4 insertions, 0 deletions
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 47cddf32aeba..53d862aee335 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -264,6 +264,10 @@ objtool_args += --no-unreachable
else
objtool_args += $(call cc-ifversion, -lt, 0405, --no-unreachable)
endif
+ifdef CONFIG_RETPOLINE
+ objtool_args += --retpoline
+endif
+
ifdef CONFIG_MODVERSIONS
objtool_o = $(@D)/.tmp_$(@F)