Merge tag 'kbuild-fixes-v6.1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild fixes from Masahiro Yamada:

 - Use POSIX-compatible grep options

 - Document git-related tips for reproducible builds

 - Fix a typo in the modpost rule

 - Suppress SIGPIPE error message from gcc-ar and llvm-ar

 - Fix segmentation fault in the menuconfig search

* tag 'kbuild-fixes-v6.1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
  kconfig: fix segmentation fault in menuconfig search
  kbuild: fix SIGPIPE error message for AR=gcc-ar and AR=llvm-ar
  kbuild: fix typo in modpost
  Documentation: kbuild: Add description of git for reproducible builds
  kbuild: use POSIX-compatible grep option

Author: torvalds

Documentation/kbuild/reproducible-builds.rst

@@ -119,6 +119,16 @@ To avoid this, you can make the vDSO different for different
 kernel versions by including an arbitrary string of "salt" in it.
 This is specified by the Kconfig symbol ``CONFIG_BUILD_SALT``.
 
+Git
+---
+
+Uncommitted changes or different commit ids in git can also lead
+to different compilation results. For example, after executing
+``git reset HEAD^``, even if the code is the same, the
+``include/config/kernel.release`` generated during compilation
+will be different, which will eventually lead to binary differences.
+See ``scripts/setlocalversion`` for details.
+
 .. _KBUILD_BUILD_TIMESTAMP: kbuild.html#kbuild-build-timestamp
 .. _KBUILD_BUILD_USER and KBUILD_BUILD_HOST: kbuild.html#kbuild-build-user-kbuild-build-host
 .. _KCFLAGS: kbuild.html#kcflags

Makefile

@@ -1218,7 +1218,7 @@ quiet_cmd_ar_vmlinux.a = AR      $@
       cmd_ar_vmlinux.a = \
 	rm -f $@; \
 	$(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
-	$(AR) mPiT $$($(AR) t $@ | head -n1) $@ $$($(AR) t $@ | grep -F --file=$(srctree)/scripts/head-object-list.txt)
+	$(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
 
 targets += vmlinux.a
 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE

scripts/Makefile.modpost

@@ -122,7 +122,7 @@ quiet_cmd_modpost = MODPOST $@
 	sed 's/ko$$/o/' $(or $(modorder-if-needed), /dev/null) | $(MODPOST) $(modpost-args) -T - $(vmlinux.o-if-present)
 
 targets += $(output-symdump)
-$(output-symdump): $(modorder-if-needed) $(vmlinux.o-if-present) $(moudle.symvers-if-present) $(MODPOST) FORCE
+$(output-symdump): $(modorder-if-needed) $(vmlinux.o-if-present) $(module.symvers-if-present) $(MODPOST) FORCE
 	$(call if_changed,modpost)
 
 __modpost: $(output-symdump)

scripts/kconfig/menu.c

@@ -722,8 +722,8 @@ static void get_prompt_str(struct gstr *r, struct property *prop,
 	if (!expr_eq(prop->menu->dep, prop->visible.expr))
 		get_dep_str(r, prop->visible.expr, "  Visible if: ");
 
-	menu = prop->menu->parent;
-	for (i = 0; menu && i < 8; menu = menu->parent) {
+	menu = prop->menu;
+	for (i = 0; menu != &rootmenu && i < 8; menu = menu->parent) {
 		bool accessible = menu_is_visible(menu);
 
 		submenu[i++] = menu;
@@ -733,16 +733,7 @@ static void get_prompt_str(struct gstr *r, struct property *prop,
 	if (head && location) {
 		jump = xmalloc(sizeof(struct jump_key));
 
-		if (menu_is_visible(prop->menu)) {
-			/*
-			 * There is not enough room to put the hint at the
-			 * beginning of the "Prompt" line. Put the hint on the
-			 * last "Location" line even when it would belong on
-			 * the former.
-			 */
-			jump->target = prop->menu;
-		} else
-			jump->target = location;
+		jump->target = location;
 
 		if (list_empty(head))
 			jump->index = 0;
@@ -758,13 +749,7 @@ static void get_prompt_str(struct gstr *r, struct property *prop,
 		menu = submenu[i];
 		if (jump && menu == location)
 			jump->offset = strlen(r->s);
-
-		if (menu == &rootmenu)
-			/* The real rootmenu prompt is ugly */
-			str_printf(r, "%*cMain menu", j, ' ');
-		else
-			str_printf(r, "%*c-> %s", j, ' ', menu_get_prompt(menu));
-
+		str_printf(r, "%*c-> %s", j, ' ', menu_get_prompt(menu));
 		if (menu->sym) {
 			str_printf(r, " (%s [=%s])", menu->sym->name ?
 				menu->sym->name : "<choice>",