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authorPeter Zijlstra <peterz@infradead.org>2020-03-18 13:33:54 +0100
committerIngo Molnar <mingo@kernel.org>2020-04-22 10:53:51 +0200
commit6804c1afd794c8135351faaa69e1503ee11393ac (patch)
tree9e3e24fb1c39b2ed9cb5b45d75035c708f747b07 /scripts
parent87ecb582f0ac85886398dde8c3cdb2225cac7786 (diff)
kbuild/objtool: Add objtool-vmlinux.o pass
Now that objtool is capable of processing vmlinux.o and actually has something useful to do there, (conditionally) add it to the final link pass. This will increase build time by a few seconds. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Miroslav Benes <mbenes@suse.cz> Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Link: https://lkml.kernel.org/r/20200416115119.287494491@infradead.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'scripts')
-rwxr-xr-xscripts/link-vmlinux.sh24
1 files changed, 24 insertions, 0 deletions
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index d09ab4afbda4..3adef49250af 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -55,6 +55,29 @@ modpost_link()
${LD} ${KBUILD_LDFLAGS} -r -o ${1} ${objects}
}
+objtool_link()
+{
+ local objtoolopt;
+
+ if [ -n "${CONFIG_VMLINUX_VALIDATION}" ]; then
+ objtoolopt="check"
+ if [ -z "${CONFIG_FRAME_POINTER}" ]; then
+ objtoolopt="${objtoolopt} --no-fp"
+ fi
+ if [ -n "${CONFIG_GCOV_KERNEL}" ]; then
+ objtoolopt="${objtoolopt} --no-unreachable"
+ fi
+ if [ -n "${CONFIG_RETPOLINE}" ]; then
+ objtoolopt="${objtoolopt} --retpoline"
+ fi
+ if [ -n "${CONFIG_X86_SMAP}" ]; then
+ objtoolopt="${objtoolopt} --uaccess"
+ fi
+ info OBJTOOL ${1}
+ tools/objtool/objtool ${objtoolopt} ${1}
+ fi
+}
+
# Link of vmlinux
# ${1} - output file
# ${2}, ${3}, ... - optional extra .o files
@@ -251,6 +274,7 @@ ${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init need-builtin=1
#link vmlinux.o
info LD vmlinux.o
modpost_link vmlinux.o
+objtool_link vmlinux.o
# modpost vmlinux.o to check for section mismatches
${MAKE} -f "${srctree}/scripts/Makefile.modpost" MODPOST_VMLINUX=1