The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     3b8e56b86faa3e44745aa764c2e1fd9dbbd16104
Gitweb:        https://git.kernel.org/tip/3b8e56b86faa3e44745aa764c2e1fd9dbbd16104
Author:        Josh Poimboeuf <jpoimboe@kernel.org>
AuthorDate:    Fri, 03 Apr 2026 13:10:29 -07:00
Committer:     Josh Poimboeuf <jpoimboe@kernel.org>
CommitterDate: Mon, 04 May 2026 21:16:05 -07:00

objtool/klp: Remove "objtool --checksum"

The checksum functionality has been moved to "objtool klp checksum"
which is now used by klp-build.  Remove the now-dead --checksum and
--debug-checksum options from the default objtool command.

Acked-by: Song Liu <song@kernel.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
---
 scripts/livepatch/klp-build   |  3 +++
 tools/objtool/builtin-check.c | 17 +----------------
 tools/objtool/check.c         | 10 ----------
 3 files changed, 4 insertions(+), 26 deletions(-)

diff --git a/scripts/livepatch/klp-build b/scripts/livepatch/klp-build
index 6103345..c1475c0 100755
--- a/scripts/livepatch/klp-build
+++ b/scripts/livepatch/klp-build
@@ -275,6 +275,9 @@ validate_config() {
 		[[ "$CONFIG_AS_VERSION" -lt 200000 ]] &&	\
 		die "Clang assembler version < 20 not supported"
 
+	[[ -x "$OBJTOOL" ]] && "$OBJTOOL" klp 2>&1 | command grep -q "not implemented" && \
+		die "objtool not built with KLP support; install xxhash-devel/libxxhash-dev (version >= 0.8) and recompile"
+
 	return 0
 }
 
diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
index b780df5..ec7f10a 100644
--- a/tools/objtool/builtin-check.c
+++ b/tools/objtool/builtin-check.c
@@ -73,7 +73,6 @@ static int parse_hacks(const struct option *opt, const char *str, int unset)
 
 static const struct option check_options[] = {
 	OPT_GROUP("Actions:"),
-	OPT_BOOLEAN(0,		 "checksum", &opts.checksum, "generate per-function checksums"),
 	OPT_BOOLEAN(0,		 "cfi", &opts.cfi, "annotate kernel control flow integrity (kCFI) function preambles"),
 	OPT_STRING_OPTARG('d',	 "disas", &opts.disas, "function-pattern", "disassemble functions", "*"),
 	OPT_CALLBACK_OPTARG('h', "hacks", NULL, NULL, "jump_label,noinstr,skylake", "patch toolchain bugs/limitations", parse_hacks),
@@ -95,7 +94,6 @@ static const struct option check_options[] = {
 	OPT_GROUP("Options:"),
 	OPT_BOOLEAN(0,		 "backtrace", &opts.backtrace, "unwind on error"),
 	OPT_BOOLEAN(0,		 "backup", &opts.backup, "create backup (.orig) file on warning/error"),
-	OPT_STRING(0,		 "debug-checksum", &opts.debug_checksum,  "funcs", "enable checksum debug output"),
 	OPT_BOOLEAN(0,		 "dry-run", &opts.dryrun, "don't write modifications"),
 	OPT_BOOLEAN(0,		 "link", &opts.link, "object is a linked object"),
 	OPT_BOOLEAN(0,		 "module", &opts.module, "object is part of a kernel module"),
@@ -165,20 +163,7 @@ static bool opts_valid(void)
 		return false;
 	}
 
-#ifndef BUILD_KLP
-	if (opts.checksum) {
-		ERROR("--checksum not supported; install xxhash-devel/libxxhash-dev (version >= 0.8) and recompile");
-		return false;
-	}
-#endif
-
-	if (opts.debug_checksum && !opts.checksum) {
-		ERROR("--debug-checksum requires --checksum");
-		return false;
-	}
-
-	if (opts.checksum		||
-	    opts.disas			||
+	if (opts.disas			||
 	    opts.hack_jump_label	||
 	    opts.hack_noinstr		||
 	    opts.ibt			||
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 3e5d335..ae047be 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -18,7 +18,6 @@
 #include <objtool/special.h>
 #include <objtool/trace.h>
 #include <objtool/warn.h>
-#include <objtool/checksum.h>
 #include <objtool/util.h>
 
 #include <linux/objtool_types.h>
@@ -4946,15 +4945,6 @@ int check(struct objtool_file *file)
 	if (opts.noabs)
 		warnings += check_abs_references(file);
 
-	if (opts.checksum) {
-		ret = calculate_checksums(file);
-		if (ret)
-			goto out;
-		ret = create_sym_checksum_section(file);
-		if (ret)
-			goto out;
-	}
-
 	if (opts.orc && nr_insns) {
 		ret = orc_create(file);
 		if (ret)