objtool: Ditch subcommands

Objtool has a fairly singular focus.  It runs on object files and does
validations and transformations which can be combined in various ways.
The subcommand model has never been a good fit, making it awkward to
combine and remove options.

Remove the "check" and "orc" subcommands in favor of a more traditional
cmdline option model.  This makes it much more flexible to use, and
easier to port individual features to other arches.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lkml.kernel.org/r/5c61ebf805e90aefc5fa62bc63468ffae53b9df6.1650300597.git.jpoimboe@redhat.com

scripts/link-vmlinux.sh

@@ -113,9 +113,6 @@ objtool_link()
 
 		# Don't perform vmlinux validation unless explicitly requested,
 		# but run objtool on vmlinux.o now that we have an object file.
-		if is_enabled CONFIG_UNWINDER_ORC; then
-			objtoolcmd="orc generate"
-		fi
 
 		if is_enabled CONFIG_X86_KERNEL_IBT; then
 			objtoolopt="${objtoolopt} --ibt"
@@ -125,6 +122,10 @@ objtool_link()
 			objtoolopt="${objtoolopt} --mcount"
 		fi
 
+		if is_enabled CONFIG_UNWINDER_ORC; then
+			objtoolopt="${objtoolopt} --orc"
+		fi
+
 		objtoolopt="${objtoolopt} --lto"
 	fi
 
@@ -134,10 +135,6 @@ objtool_link()
 
 	if [ -n "${objtoolopt}" ]; then
 
-		if [ -z "${objtoolcmd}" ]; then
-			objtoolcmd="check"
-		fi
-
 		if is_enabled CONFIG_RETPOLINE; then
 			objtoolopt="${objtoolopt} --retpoline"
 		fi
@@ -161,7 +158,7 @@ objtool_link()
 		objtoolopt="${objtoolopt} --vmlinux"
 
 		info OBJTOOL ${1}
-		tools/objtool/objtool ${objtoolcmd} ${objtoolopt} ${1}
+		tools/objtool/objtool ${objtoolopt} ${1}
 	fi
 }