Kbuild updates for v5.3 (2nd)

- match the directory structure of the linux-libc-dev package to that of
   Debian-based distributions
 
 - fix incorrect include/config/auto.conf generation when Kconfig creates
   it along with the .config file
 
 - remove misleading $(AS) from documents
 
 - clean up precious tag files by distclean instead of mrproper
 
 - add a new coccinelle patch for devm_platform_ioremap_resource migration
 
 - refactor module-related scripts to read modules.order instead of
   $(MODVERDIR)/*.mod files to get the list of created modules
 
 - remove MODVERDIR
 
 - update list of header compile-test
 
 - add -fcf-protection=none flag to avoid conflict with the retpoline
   flags when CONFIG_RETPOLINE=y
 
 - misc cleanups
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 =D36u
 -----END PGP SIGNATURE-----

Merge tag 'kbuild-v5.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Pull more Kbuild updates from Masahiro Yamada:

 - match the directory structure of the linux-libc-dev package to that
   of Debian-based distributions

 - fix incorrect include/config/auto.conf generation when Kconfig
   creates it along with the .config file

 - remove misleading $(AS) from documents

 - clean up precious tag files by distclean instead of mrproper

 - add a new coccinelle patch for devm_platform_ioremap_resource
   migration

 - refactor module-related scripts to read modules.order instead of
   $(MODVERDIR)/*.mod files to get the list of created modules

 - remove MODVERDIR

 - update list of header compile-test

 - add -fcf-protection=none flag to avoid conflict with the retpoline
   flags when CONFIG_RETPOLINE=y

 - misc cleanups

* tag 'kbuild-v5.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (25 commits)
  kbuild: add -fcf-protection=none when using retpoline flags
  kbuild: update compile-test header list for v5.3-rc1
  kbuild: split out *.mod out of {single,multi}-used-m rules
  kbuild: remove 'prepare1' target
  kbuild: remove the first line of *.mod files
  kbuild: create *.mod with full directory path and remove MODVERDIR
  kbuild: export_report: read modules.order instead of .tmp_versions/*.mod
  kbuild: modpost: read modules.order instead of $(MODVERDIR)/*.mod
  kbuild: modsign: read modules.order instead of $(MODVERDIR)/*.mod
  kbuild: modinst: read modules.order instead of $(MODVERDIR)/*.mod
  scsi: remove pointless $(MODVERDIR)/$(obj)/53c700.ver
  kbuild: remove duplication from modules.order in sub-directories
  kbuild: get rid of kernel/ prefix from in-tree modules.{order,builtin}
  kbuild: do not create empty modules.order in the prepare stage
  coccinelle: api: add devm_platform_ioremap_resource script
  kbuild: compile-test headers listed in header-test-m as well
  kbuild: remove unused hostcc-option
  kbuild: remove tag files by distclean instead of mrproper
  kbuild: add --hash-style= and --build-id unconditionally
  kbuild: get rid of misleading $(AS) from documents
  ...

scripts/Kbuild.include

@@ -125,11 +125,6 @@ CC_OPTION_CFLAGS = $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
 cc-option = $(call __cc-option, $(CC),\
 	$(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS),$(1),$(2))
 
-# hostcc-option
-# Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
-hostcc-option = $(call __cc-option, $(HOSTCC),\
-	$(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS),$(1),$(2))
-
 # cc-option-yn
 # Usage: flag := $(call cc-option-yn,-march=winchip-c6)
 cc-option-yn = $(call try-run,\

scripts/Makefile.build

@@ -63,14 +63,14 @@ ifneq ($(strip $(real-obj-y) $(need-builtin)),)
 builtin-target := $(obj)/built-in.a
 endif
 
-ifdef CONFIG_MODULES
+ifeq ($(CONFIG_MODULES)$(need-modorder),y1)
 modorder-target := $(obj)/modules.order
 endif
 
-# We keep a list of all modules in $(MODVERDIR)
+mod-targets := $(patsubst %.o, %.mod, $(obj-m))
 
 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
-	 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
+	 $(if $(KBUILD_MODULES),$(obj-m) $(mod-targets) $(modorder-target)) \
 	 $(subdir-ym) $(always)
 	@:
 
@@ -87,11 +87,6 @@ ifneq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
   cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $<
 endif
 
-# Do section mismatch analysis for each module/built-in.a
-ifdef CONFIG_DEBUG_SECTION_MISMATCH
-  cmd_secanalysis = ; scripts/mod/modpost $@
-endif
-
 # Compile C sources (.c)
 # ---------------------------------------------------------------------------
 
@@ -268,7 +263,7 @@ endef
 
 # List module undefined symbols (or empty line if not enabled)
 ifdef CONFIG_TRIM_UNUSED_KSYMS
-cmd_undef_syms = $(NM) $@ | sed -n 's/^  *U //p' | xargs echo
+cmd_undef_syms = $(NM) $< | sed -n 's/^  *U //p' | xargs echo
 else
 cmd_undef_syms = echo
 endif
@@ -278,13 +273,15 @@ $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
 	$(call cmd,force_checksrc)
 	$(call if_changed_rule,cc_o_c)
 
-# Single-part modules are special since we need to mark them in $(MODVERDIR)
+cmd_mod = { \
+	echo $(if $($*-objs)$($*-y)$($*-m), $(addprefix $(obj)/, $($*-objs) $($*-y) $($*-m)), $(@:.mod=.o)); \
+	$(cmd_undef_syms); \
+	} > $@
 
-$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
-	$(call cmd,force_checksrc)
-	$(call if_changed_rule,cc_o_c)
-	@{ echo $(@:.o=.ko); echo $@; \
-	   $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
+$(obj)/%.mod: $(obj)/%.o FORCE
+	$(call if_changed,mod)
+
+targets += $(mod-targets)
 
 quiet_cmd_cc_lst_c = MKLST   $@
       cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
@@ -294,7 +291,7 @@ quiet_cmd_cc_lst_c = MKLST   $@
 $(obj)/%.lst: $(src)/%.c FORCE
 	$(call if_changed_dep,cc_lst_c)
 
-# header test (header-test-y target)
+# header test (header-test-y, header-test-m target)
 # ---------------------------------------------------------------------------
 
 quiet_cmd_cc_s_h = CC      $@
@@ -423,13 +420,10 @@ endif # builtin-target
 #
 # Create commands to either record .ko file or cat modules.order from
 # a subdirectory
-modorder-cmds =						\
-	$(foreach m, $(modorder),			\
-		$(if $(filter %/modules.order, $m),	\
-			cat $m;, echo kernel/$m;))
-
 $(modorder-target): $(subdir-ym) FORCE
-	$(Q)(cat /dev/null; $(modorder-cmds)) > $@
+	$(Q){ $(foreach m, $(modorder), \
+	$(if $(filter %/modules.order, $m), cat $m, echo $m);) :; } \
+	| $(AWK) '!x[$$0]++' - > $@
 
 #
 # Rule to compile a set of .o files into one .a file (with symbol table)
@@ -464,12 +458,10 @@ endif
 # module is turned into a multi object module, $^ will contain header file
 # dependencies recorded in the .*.cmd file.
 quiet_cmd_link_multi-m = LD [M]  $@
-cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^) $(cmd_secanalysis)
+      cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^)
 
 $(multi-used-m): FORCE
 	$(call if_changed,link_multi-m)
-	@{ echo $(@:.o=.ko); echo $(filter %.o,$^); \
-	   $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
 $(call multi_depend, $(multi-used-m), .o, -objs -y -m)
 
 targets += $(multi-used-m)

scripts/Makefile.lib

@@ -78,7 +78,7 @@ header-test-y	+= $(filter-out $(header-test-), \
 		$(wildcard $(addprefix $(srctree)/$(src)/, \
 		$(header-test-pattern-y)))))
 
-extra-$(CONFIG_HEADER_TEST) += $(addsuffix .s, $(header-test-y))
+extra-$(CONFIG_HEADER_TEST) += $(addsuffix .s, $(header-test-y) $(header-test-m))
 
 # Add subdir path
 

scripts/Makefile.modbuiltin

@@ -40,7 +40,7 @@ __modbuiltin: $(modbuiltin-target) $(subdir-ym)
 	@:
 
 $(modbuiltin-target): $(subdir-ym) FORCE
-	$(Q)(for m in $(modbuiltin-mods); do echo kernel/$$m; done;	\
+	$(Q)(for m in $(modbuiltin-mods); do echo $$m; done;	\
 	cat /dev/null $(modbuiltin-subdirs)) > $@
 
 PHONY += FORCE

scripts/Makefile.modinst

@@ -8,10 +8,7 @@ __modinst:
 
 include scripts/Kbuild.include
 
-#
-
-__modules := $(sort $(shell grep -h '\.ko$$' /dev/null $(wildcard $(MODVERDIR)/*.mod)))
-modules := $(patsubst %.o,%.ko,$(wildcard $(__modules:.ko=.o)))
+modules := $(sort $(shell cat $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)modules.order))
 
 PHONY += $(modules)
 __modinst: $(modules)

scripts/Makefile.modpost

@@ -6,11 +6,12 @@
 # Stage one of module building created the following:
 # a) The individual .o files used for the module
 # b) A <module>.o file which is the .o files above linked together
-# c) A <module>.mod file in $(MODVERDIR)/, listing the name of the
-#    the preliminary <module>.o file, plus all .o files
+# c) A <module>.mod file, listing the name of the preliminary <module>.o file,
+#    plus all .o files
+# d) modules.order, which lists all the modules
 
 # Stage 2 is handled by this file and does the following
-# 1) Find all modules from the files listed in $(MODVERDIR)/
+# 1) Find all modules listed in modules.order
 # 2) modpost is then used to
 # 3)  create one <module>.mod.c file pr. module
 # 4)  create one Module.symvers file with CRC for all exported symbols
@@ -60,10 +61,12 @@ include scripts/Makefile.lib
 kernelsymfile := $(objtree)/Module.symvers
 modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers
 
-# Step 1), find all modules listed in $(MODVERDIR)/
-MODLISTCMD := find $(MODVERDIR) -name '*.mod' | xargs -r grep -h '\.ko$$' | sort -u
-__modules := $(shell $(MODLISTCMD))
-modules   := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o)))
+modorder := $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)modules.order
+
+# Step 1), find all modules listed in modules.order
+ifdef CONFIG_MODULES
+modules := $(sort $(shell cat $(modorder)))
+endif
 
 # Stop after building .o files if NOFINAL is set. Makes compile tests quicker
 _modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules))
@@ -84,7 +87,7 @@ MODPOST_OPT=$(subst -i,-n,$(filter -i,$(MAKEFLAGS)))
 
 # We can go over command line length here, so be careful.
 quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules
-      cmd_modpost = $(MODLISTCMD) | sed 's/\.ko$$/.o/' | $(modpost) $(MODPOST_OPT) -s -T -
+      cmd_modpost = sed 's/ko$$/o/' $(modorder) | $(modpost) $(MODPOST_OPT) -s -T -
 
 PHONY += __modpost
 __modpost: $(modules:.ko=.o) FORCE

scripts/Makefile.modsign

@@ -8,8 +8,7 @@ __modsign:
 
 include scripts/Kbuild.include
 
-__modules := $(sort $(shell grep -h '\.ko$$' /dev/null $(wildcard $(MODVERDIR)/*.mod)))
-modules := $(patsubst %.o,%.ko,$(wildcard $(__modules:.ko=.o)))
+modules := $(sort $(shell cat modules.order))
 
 PHONY += $(modules)
 __modsign: $(modules)

scripts/adjust_autoksyms.sh

@@ -8,8 +8,7 @@
 #
 
 # Create/update the include/generated/autoksyms.h file from the list
-# of all module's needed symbols as recorded on the third line of
-# .tmp_versions/*.mod files.
+# of all module's needed symbols as recorded on the second line of *.mod files.
 #
 # For each symbol being added or removed, the corresponding dependency
 # file's timestamp is updated to force a rebuild of the affected source
@@ -47,13 +46,10 @@ cat > "$new_ksyms_file" << EOT
  */
 
 EOT
-[ "$(ls -A "$MODVERDIR")" ] &&
-for mod in "$MODVERDIR"/*.mod; do
-	sed -n -e '3{s/ /\n/g;/^$/!p;}' "$mod"
-done | sort -u |
-while read sym; do
-	echo "#define __KSYM_${sym} 1"
-done >> "$new_ksyms_file"
+sed 's/ko$/mod/' modules.order |
+xargs -n1 sed -n -e '2{s/ /\n/g;/^$/!p;}' -- |
+sort -u |
+sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$new_ksyms_file"
 
 # Special case for modversions (see modpost.c)
 if [ -n "$CONFIG_MODVERSIONS" ]; then

scripts/coccinelle/api/devm_platform_ioremap_resource.cocci

@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0
+/// Use devm_platform_ioremap_resource helper which wraps
+/// platform_get_resource() and devm_ioremap_resource() together.
+///
+// Confidence: High
+// Copyright: (C) 2019 Himanshu Jha GPLv2.
+// Copyright: (C) 2019 Julia Lawall, Inria/LIP6. GPLv2.
+// Keywords: platform_get_resource, devm_ioremap_resource,
+// Keywords: devm_platform_ioremap_resource
+
+virtual patch
+virtual report
+
+@r depends on patch && !report@
+expression e1, e2, arg1, arg2, arg3;
+identifier id;
+@@
+
+(
+- id = platform_get_resource(arg1, IORESOURCE_MEM, arg2);
+|
+- struct resource *id = platform_get_resource(arg1, IORESOURCE_MEM, arg2);
+)
+  ... when != id
+- e1 = devm_ioremap_resource(arg3, id);
++ e1 = devm_platform_ioremap_resource(arg1, arg2);
+  ... when != id
+? id = e2
+
+@r1 depends on patch && !report@
+identifier r.id;
+type T;
+@@
+
+- T *id;
+  ...when != id
+
+@r2 depends on report && !patch@
+identifier id;
+expression e1, e2, arg1, arg2, arg3;
+position j0;
+@@
+
+(
+  id = platform_get_resource(arg1, IORESOURCE_MEM, arg2);
+|
+  struct resource *id = platform_get_resource(arg1, IORESOURCE_MEM, arg2);
+)
+  ... when != id
+  e1@j0 = devm_ioremap_resource(arg3, id);
+  ... when != id
+? id = e2
+
+@script:python depends on report && !patch@
+e1 << r2.e1;
+j0 << r2.j0;
+@@
+
+msg = "WARNING: Use devm_platform_ioremap_resource for %s" % (e1)
+coccilib.report.print_report(j0[0], msg)

scripts/export_report.pl

@@ -52,13 +52,12 @@ sub usage {
 
 sub collectcfiles {
     my @file;
-    while (<.tmp_versions/*.mod>) {
-	open my $fh, '<', $_ or die "cannot open $_: $!\n";
-	push (@file,
-	      grep s/\.ko/.mod.c/,	# change the suffix
-	      grep m/.+\.ko/,		# find the .ko path
-	      <$fh>);			# lines in opened file
+    open my $fh, '< modules.order' or die "cannot open modules.order: $!\n";
+    while (<$fh>) {
+	s/\.ko$/.mod.c/;
+	push (@file, $_)
     }
+    close($fh);
     chomp @file;
     return @file;
 }

scripts/kconfig/Makefile

@@ -94,7 +94,7 @@ configfiles=$(wildcard $(srctree)/kernel/configs/$@ $(srctree)/arch/$(SRCARCH)/c
 %.config: $(obj)/conf
 	$(if $(call configfiles),, $(error No configuration exists for this target on this architecture))
 	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh -m .config $(configfiles)
-	+$(Q)yes "" | $(MAKE) -f $(srctree)/Makefile oldconfig
+	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
 
 PHONY += kvmconfig
 kvmconfig: kvm_guest.config

scripts/kconfig/confdata.c

@@ -895,7 +895,8 @@ int conf_write(const char *name)
 				     "# %s\n"
 				     "#\n", str);
 			need_newline = false;
-		} else if (!(sym->flags & SYMBOL_CHOICE)) {
+		} else if (!(sym->flags & SYMBOL_CHOICE) &&
+			   !(sym->flags & SYMBOL_WRITTEN)) {
 			sym_calc_value(sym);
 			if (!(sym->flags & SYMBOL_WRITE))
 				goto next;
@@ -903,7 +904,7 @@ int conf_write(const char *name)
 				fprintf(out, "\n");
 				need_newline = false;
 			}
-			sym->flags &= ~SYMBOL_WRITE;
+			sym->flags |= SYMBOL_WRITTEN;
 			conf_write_symbol(out, sym, &kconfig_printer_cb, NULL);
 		}
 
@@ -1063,8 +1064,6 @@ int conf_write_autoconf(int overwrite)
 	if (!overwrite && is_present(autoconf_name))
 		return 0;
 
-	sym_clear_all_valid();
-
 	conf_write_dep("include/config/auto.conf.cmd");
 
 	if (conf_touch_deps())

scripts/kconfig/expr.h

@@ -141,6 +141,7 @@ struct symbol {
 #define SYMBOL_OPTIONAL   0x0100  /* choice is optional - values can be 'n' */
 #define SYMBOL_WRITE      0x0200  /* write symbol to file (KCONFIG_CONFIG) */
 #define SYMBOL_CHANGED    0x0400  /* ? */
+#define SYMBOL_WRITTEN    0x0800  /* track info to avoid double-write to .config */
 #define SYMBOL_NO_WRITE   0x1000  /* Symbol for internal use only; it will not be written */
 #define SYMBOL_CHECKED    0x2000  /* used during dependency checking */
 #define SYMBOL_WARNED     0x8000  /* warning has been issued */

scripts/mod/sumversion.c

@@ -396,34 +396,19 @@ void get_src_version(const char *modname, char sum[], unsigned sumlen)
 	unsigned long len;
 	struct md4_ctx md;
 	char *sources, *end, *fname;
-	const char *basename;
 	char filelist[PATH_MAX + 1];
-	char *modverdir = getenv("MODVERDIR");
 
-	if (!modverdir)
-		modverdir = ".";
-
-	/* Source files for module are in .tmp_versions/modname.mod,
-	   after the first line. */
-	if (strrchr(modname, '/'))
-		basename = strrchr(modname, '/') + 1;
-	else
-		basename = modname;
-	snprintf(filelist, sizeof(filelist), "%s/%.*s.mod", modverdir,
-		(int) strlen(basename) - 2, basename);
+	/* objects for a module are listed in the first line of *.mod file. */
+	snprintf(filelist, sizeof(filelist), "%.*smod",
+		 (int)strlen(modname) - 1, modname);
 
 	file = grab_file(filelist, &len);
 	if (!file)
 		/* not a module or .mod file missing - ignore */
 		return;
 
-	sources = strchr(file, '\n');
-	if (!sources) {
-		warn("malformed versions file for %s\n", modname);
-		goto release;
-	}
+	sources = file;
 
-	sources++;
 	end = strchr(sources, '\n');
 	if (!end) {
 		warn("bad ending versions file for %s\n", modname);

scripts/modules-check.sh

@@ -9,7 +9,7 @@ check_same_name_modules()
 	for m in $(sed 's:.*/::' modules.order | sort | uniq -d)
 	do
 		echo "warning: same module names found:" >&2
-		sed -n "/\/$m/s:^kernel/:  :p" modules.order >&2
+		sed -n "/\/$m/s:^:  :p" modules.order >&2
 	done
 }
 

scripts/package/builddeb

@@ -132,6 +132,11 @@ fi
 if [ "$ARCH" != "um" ]; then
 	$MAKE -f $srctree/Makefile headers
 	$MAKE -f $srctree/Makefile headers_install INSTALL_HDR_PATH="$libc_headers_dir/usr"
+	# move asm headers to /usr/include/<libc-machine>/asm to match the structure
+	# used by Debian-based distros (to support multi-arch)
+	host_arch=$(dpkg-architecture -a$(cat debian/arch) -qDEB_HOST_MULTIARCH)
+	mkdir $libc_headers_dir/usr/include/$host_arch
+	mv $libc_headers_dir/usr/include/asm $libc_headers_dir/usr/include/$host_arch/
 fi
 
 # Install the maintainer scripts

scripts/package/mkdebian

@@ -197,6 +197,7 @@ Architecture: $debarch
 Description: Linux support headers for userspace development
  This package provides userspaces headers from the Linux kernel.  These headers
  are used by the installed headers for GNU glibc and other system libraries.
+Multi-Arch: same
 
 Package: $dbg_packagename
 Section: debug

scripts/package/mkspec

@@ -29,7 +29,7 @@ fi
 
 PROVIDES="$PROVIDES kernel-$KERNELRELEASE"
 __KERNELRELEASE=$(echo $KERNELRELEASE | sed -e "s/-/_/g")
-EXCLUDES="$RCS_TAR_IGNORE --exclude=.tmp_versions --exclude=*vmlinux* \
+EXCLUDES="$RCS_TAR_IGNORE --exclude=*vmlinux* --exclude=*.mod \
 --exclude=*.o --exclude=*.ko --exclude=*.cmd --exclude=Documentation \
 --exclude=.config.old --exclude=.missing-syscalls.d --exclude=*.s"