diff mbox series

[v4,06/14] kbuild: link symbol CRCs at final link, removing CONFIG_MODULE_REL_CRCS

Message ID 20220508190631.2386038-7-masahiroy@kernel.org (mailing list archive)
State New
Headers show
Series kbuild: yet another series of cleanups (modpost, LTO, MODULE_REL_CRCS, export.h) | expand

Commit Message

Masahiro Yamada May 8, 2022, 7:06 p.m. UTC
include/{linux,asm-generic}/export.h defines a weak symbol, __crc_*
as a placeholder.

Genksyms writes the version CRCs into the linker script, which will be
used for filling the __crc_* symbols. The linker script format depends
on CONFIG_MODULE_REL_CRCS. If it is enabled, __crc_* holds the offset
to the reference of CRC.

It is time to get rid of this complexity.

Now that modpost parses text files (.*.cmd) to collect all the CRCs,
it can generate C code that will be linked to the vmlinux or modules.

Generate a new C file, .vmlinux.export.c, which contains the CRCs of
symbols exported by vmlinux. It is compiled and linked to vmlinux in
scripts/link-vmlinux.sh.

Put the CRCs of symbols exported by modules into the existing *.mod.c
files. No additional build step is needed for modules. As before,
*.mod.c are compiled and linked to *.ko in scripts/Makefile.modfinal.

No linker magic is used here. The new C implementation works in the
same way, whether CONFIG_RELOCATABLE is enabled or not.
CONFIG_MODULE_REL_CRCS is no longer needed.

Previously, Kbuild invoked additional $(LD) to update the CRCs in
objects, but this step is unneeded too.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
---

Changes in v4:
  - Rename .vmlinux-symver.c to .vmlinux.export.c
    because I notice this approach is useful for further cleanups,
    not only for modversioning but also for overall EXPORT_SYMBOL.

Changes in v3:
  - New patch

 arch/powerpc/Kconfig            |  1 -
 arch/s390/Kconfig               |  1 -
 arch/um/Kconfig                 |  1 -
 include/asm-generic/export.h    | 22 ++++++++--------------
 include/linux/export-internal.h | 16 ++++++++++++++++
 include/linux/export.h          | 30 ++++++++----------------------
 init/Kconfig                    |  4 ----
 kernel/module.c                 | 10 +---------
 scripts/Makefile.build          | 27 ++++-----------------------
 scripts/genksyms/genksyms.c     | 17 ++++-------------
 scripts/link-vmlinux.sh         | 18 +++++++++++++-----
 scripts/mod/modpost.c           | 28 ++++++++++++++++++++++++----
 12 files changed, 78 insertions(+), 97 deletions(-)
 create mode 100644 include/linux/export-internal.h

Comments

Nick Desaulniers May 9, 2022, 5:50 p.m. UTC | #1
On Sun, May 8, 2022 at 12:10 PM Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> diff --git a/include/asm-generic/export.h b/include/asm-generic/export.h
> index 07a36a874dca..51ce72ce80fa 100644
> --- a/include/asm-generic/export.h
> +++ b/include/asm-generic/export.h
> @@ -2,6 +2,14 @@
>  #ifndef __ASM_GENERIC_EXPORT_H
>  #define __ASM_GENERIC_EXPORT_H
>
> +/*
> + * This comment block is used by fixdep. Please do not remove.

I don't know much about fixdep. How does that work, if you could summarize?

> + *
> + * When CONFIG_MODVERSIONS is changed from n to y, all source files having
> + * EXPORT_SYMBOL variants must be re-compiled because genksyms is run as a
> + * side effect of the .o build rule.
> + */
> +
>  #ifndef KSYM_FUNC
>  #define KSYM_FUNC(x) x
>  #endif
> @@ -12,9 +20,6 @@
>  #else
>  #define KSYM_ALIGN 4
>  #endif
> -#ifndef KCRC_ALIGN
> -#define KCRC_ALIGN 4
> -#endif

The #ifndef is there because arch/m68k/include/asm/export.h:1 defines
KCRC_ALIGN. You should delete that, too.

> diff --git a/scripts/genksyms/genksyms.c b/scripts/genksyms/genksyms.c
> index 4827c5abe5b7..6e6933ae7911 100644
> --- a/scripts/genksyms/genksyms.c
> +++ b/scripts/genksyms/genksyms.c
> @@ -33,7 +33,7 @@ char *cur_filename;
>  int in_source_file;
>
>  static int flag_debug, flag_dump_defs, flag_reference, flag_dump_types,
> -          flag_preserve, flag_warnings, flag_rel_crcs;
> +          flag_preserve, flag_warnings;
>
>  static int errors;
>  static int nsyms;
> @@ -681,10 +681,7 @@ void export_symbol(const char *name)
>                         fputs(">\n", debugfile);
>
>                 /* Used as a linker script. */

^ Does this comment still apply?

> -               printf(!flag_rel_crcs ? "__crc_%s = 0x%08lx;\n" :
> -                      "SECTIONS { .rodata : ALIGN(4) { "
> -                      "__crc_%s = .; LONG(0x%08lx); } }\n",
> -                      name, crc);
> +               printf("__crc_%s = 0x%08lx;\n", name, crc);
>         }
>  }
>
> diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
> index eceb3ee7ec06..6aee2401f3ad 100755
> --- a/scripts/link-vmlinux.sh
> +++ b/scripts/link-vmlinux.sh
> @@ -88,11 +88,6 @@ modpost_link()
>                 gen_initcalls
>                 lds="-T .tmp_initcalls.lds"
>
> -               if is_enabled CONFIG_MODVERSIONS; then
> -                       gen_symversions

^ this is the only caller of gen_symversions, right? Then
gen_symversions can be cleaned up, too?

> -                       lds="${lds} -T .tmp_symversions.lds"
> -               fi
> -
>                 # This might take a while, so indicate that we're doing
>                 # an LTO link
>                 info LTO ${1}
> @@ -183,6 +178,10 @@ vmlinux_link()
>                 libs="${KBUILD_VMLINUX_LIBS}"
>         fi
>
> +       if is_enabled CONFIG_MODULES; then
> +               objs="${objs} .vmlinux.export.o"
> +       fi
> +
>         if [ "${SRCARCH}" = "um" ]; then
>                 wl=-Wl,
>                 ld="${CC}"
> @@ -312,6 +311,7 @@ cleanup()
>         rm -f vmlinux.o
>         rm -f .vmlinux.d
>         rm -f .vmlinux.objs
> +       rm -f .vmlinux.export.c

Probably can drop the `rm -f .tmp_symversions.lds` here, too?
Masahiro Yamada May 10, 2022, 1:03 p.m. UTC | #2
On Tue, May 10, 2022 at 2:51 AM Nick Desaulniers
<ndesaulniers@google.com> wrote:
>
>  On Sun, May 8, 2022 at 12:10 PM Masahiro Yamada <masahiroy@kernel.org> wrote:
> >
> > diff --git a/include/asm-generic/export.h b/include/asm-generic/export.h
> > index 07a36a874dca..51ce72ce80fa 100644
> > --- a/include/asm-generic/export.h
> > +++ b/include/asm-generic/export.h
> > @@ -2,6 +2,14 @@
> >  #ifndef __ASM_GENERIC_EXPORT_H
> >  #define __ASM_GENERIC_EXPORT_H
> >
> > +/*
> > + * This comment block is used by fixdep. Please do not remove.
>
> I don't know much about fixdep. How does that work, if you could summarize?


You can find detailed explanation in scripts/basic/fixdep.c


In short, it works like this:

fixdep parses every source (including headers).
If it finds "CONFIG_MODVERSIONS", it adds a dependency
on $(wildcard include/config/MODVERSIONS)
to the .cmd files.

If CONFIG_MODVERSIONS is toggled in Kconfig,
it touches include/config/MODVERSIONS.    [1]

In the next run of Make, all the sources depending on
CONFIG_MODVERSIONS will be re-compiled because the
timestamp of include/config/MODVERSIONS is up-to-date.


[1]: https://github.com/torvalds/linux/blob/v5.17/scripts/kconfig/confdata.c#L141





> > + *
> > + * When CONFIG_MODVERSIONS is changed from n to y, all source files having
> > + * EXPORT_SYMBOL variants must be re-compiled because genksyms is run as a
> > + * side effect of the .o build rule.
> > + */
> > +
> >  #ifndef KSYM_FUNC
> >  #define KSYM_FUNC(x) x
> >  #endif
> > @@ -12,9 +20,6 @@
> >  #else
> >  #define KSYM_ALIGN 4
> >  #endif
> > -#ifndef KCRC_ALIGN
> > -#define KCRC_ALIGN 4
> > -#endif
>
> The #ifndef is there because arch/m68k/include/asm/export.h:1 defines
> KCRC_ALIGN. You should delete that, too.

Nice catch! I will clean it up too.




>
> > diff --git a/scripts/genksyms/genksyms.c b/scripts/genksyms/genksyms.c
> > index 4827c5abe5b7..6e6933ae7911 100644
> > --- a/scripts/genksyms/genksyms.c
> > +++ b/scripts/genksyms/genksyms.c
> > @@ -33,7 +33,7 @@ char *cur_filename;
> >  int in_source_file;
> >
> >  static int flag_debug, flag_dump_defs, flag_reference, flag_dump_types,
> > -          flag_preserve, flag_warnings, flag_rel_crcs;
> > +          flag_preserve, flag_warnings;
> >
> >  static int errors;
> >  static int nsyms;
> > @@ -681,10 +681,7 @@ void export_symbol(const char *name)
> >                         fputs(">\n", debugfile);
> >
> >                 /* Used as a linker script. */
>
> ^ Does this comment still apply?

No.  From this commit going forward,
the genksyms output will not be used as a linker script.

08/14 will delete this comment anyway, but
it is possible to remove it in this commit.








>
> > -               printf(!flag_rel_crcs ? "__crc_%s = 0x%08lx;\n" :
> > -                      "SECTIONS { .rodata : ALIGN(4) { "
> > -                      "__crc_%s = .; LONG(0x%08lx); } }\n",
> > -                      name, crc);
> > +               printf("__crc_%s = 0x%08lx;\n", name, crc);
> >         }
> >  }
> >
> > diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
> > index eceb3ee7ec06..6aee2401f3ad 100755
> > --- a/scripts/link-vmlinux.sh
> > +++ b/scripts/link-vmlinux.sh
> > @@ -88,11 +88,6 @@ modpost_link()
> >                 gen_initcalls
> >                 lds="-T .tmp_initcalls.lds"
> >
> > -               if is_enabled CONFIG_MODVERSIONS; then
> > -                       gen_symversions
>
> ^ this is the only caller of gen_symversions, right? Then
> gen_symversions can be cleaned up, too?


We can keep it in this commit.

The follow-up cleaning is done in 07/14.

To avoid too big commit,
I separated the build flow change and
trivial cleanups.



>
> > -                       lds="${lds} -T .tmp_symversions.lds"
> > -               fi
> > -
> >                 # This might take a while, so indicate that we're doing
> >                 # an LTO link
> >                 info LTO ${1}
> > @@ -183,6 +178,10 @@ vmlinux_link()
> >                 libs="${KBUILD_VMLINUX_LIBS}"
> >         fi
> >
> > +       if is_enabled CONFIG_MODULES; then
> > +               objs="${objs} .vmlinux.export.o"
> > +       fi
> > +
> >         if [ "${SRCARCH}" = "um" ]; then
> >                 wl=-Wl,
> >                 ld="${CC}"
> > @@ -312,6 +311,7 @@ cleanup()
> >         rm -f vmlinux.o
> >         rm -f .vmlinux.d
> >         rm -f .vmlinux.objs
> > +       rm -f .vmlinux.export.c
>
> Probably can drop the `rm -f .tmp_symversions.lds` here, too?

It will be cleaned up by 07/14.







> --
> Thanks,
> ~Nick Desaulniers



--
Best Regards
Masahiro Yamada
diff mbox series

Patch

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 174edabb74fa..a4e8dd889e29 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -566,7 +566,6 @@  config RELOCATABLE
 	bool "Build a relocatable kernel"
 	depends on PPC64 || (FLATMEM && (44x || FSL_BOOKE))
 	select NONSTATIC_KERNEL
-	select MODULE_REL_CRCS if MODVERSIONS
 	help
 	  This builds a kernel image that is capable of running at the
 	  location the kernel is loaded at. For ppc32, there is no any
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 77b5a03de13a..aa5848004c76 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -567,7 +567,6 @@  endchoice
 
 config RELOCATABLE
 	bool "Build a relocatable kernel"
-	select MODULE_REL_CRCS if MODVERSIONS
 	default y
 	help
 	  This builds a kernel image that retains relocation information
diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index 4d398b80aea8..e8983d098e73 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -106,7 +106,6 @@  config LD_SCRIPT_DYN
 	bool
 	default y
 	depends on !LD_SCRIPT_STATIC
-	select MODULE_REL_CRCS if MODVERSIONS
 
 config LD_SCRIPT_DYN_RPATH
 	bool "set rpath in the binary" if EXPERT
diff --git a/include/asm-generic/export.h b/include/asm-generic/export.h
index 07a36a874dca..51ce72ce80fa 100644
--- a/include/asm-generic/export.h
+++ b/include/asm-generic/export.h
@@ -2,6 +2,14 @@ 
 #ifndef __ASM_GENERIC_EXPORT_H
 #define __ASM_GENERIC_EXPORT_H
 
+/*
+ * This comment block is used by fixdep. Please do not remove.
+ *
+ * When CONFIG_MODVERSIONS is changed from n to y, all source files having
+ * EXPORT_SYMBOL variants must be re-compiled because genksyms is run as a
+ * side effect of the .o build rule.
+ */
+
 #ifndef KSYM_FUNC
 #define KSYM_FUNC(x) x
 #endif
@@ -12,9 +20,6 @@ 
 #else
 #define KSYM_ALIGN 4
 #endif
-#ifndef KCRC_ALIGN
-#define KCRC_ALIGN 4
-#endif
 
 .macro __put, val, name
 #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
@@ -43,17 +48,6 @@  __ksymtab_\name:
 __kstrtab_\name:
 	.asciz "\name"
 	.previous
-#ifdef CONFIG_MODVERSIONS
-	.section ___kcrctab\sec+\name,"a"
-	.balign KCRC_ALIGN
-#if defined(CONFIG_MODULE_REL_CRCS)
-	.long __crc_\name - .
-#else
-	.long __crc_\name
-#endif
-	.weak __crc_\name
-	.previous
-#endif
 #endif
 .endm
 
diff --git a/include/linux/export-internal.h b/include/linux/export-internal.h
new file mode 100644
index 000000000000..77175d561058
--- /dev/null
+++ b/include/linux/export-internal.h
@@ -0,0 +1,16 @@ 
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Please do not include this explicitly.
+ * This is used by C files generated by modpost.
+ */
+
+#ifndef __LINUX_EXPORT_INTERNAL_H__
+#define __LINUX_EXPORT_INTERNAL_H__
+
+#include <linux/compiler.h>
+#include <linux/types.h>
+
+#define SYMBOL_CRC(sym, crc, sec)   \
+	u32 __section("___kcrctab" sec "+" #sym) __crc_##sym = crc
+
+#endif /* __LINUX_EXPORT_INTERNAL_H__ */
diff --git a/include/linux/export.h b/include/linux/export.h
index 27d848712b90..6c8e24e723bd 100644
--- a/include/linux/export.h
+++ b/include/linux/export.h
@@ -11,6 +11,14 @@ 
  * hackers place grumpy comments in header files.
  */
 
+/*
+ * This comment block is used by fixdep. Please do not remove.
+ *
+ * When CONFIG_MODVERSIONS is changed from n to y, all source files having
+ * EXPORT_SYMBOL variants must be re-compiled because genksyms is run as a
+ * side effect of the .o build rule.
+ */
+
 #ifndef __ASSEMBLY__
 #ifdef MODULE
 extern struct module __this_module;
@@ -19,26 +27,6 @@  extern struct module __this_module;
 #define THIS_MODULE ((struct module *)0)
 #endif
 
-#ifdef CONFIG_MODVERSIONS
-/* Mark the CRC weak since genksyms apparently decides not to
- * generate a checksums for some symbols */
-#if defined(CONFIG_MODULE_REL_CRCS)
-#define __CRC_SYMBOL(sym, sec)						\
-	asm("	.section \"___kcrctab" sec "+" #sym "\", \"a\"	\n"	\
-	    "	.weak	__crc_" #sym "				\n"	\
-	    "	.long	__crc_" #sym " - .			\n"	\
-	    "	.previous					\n")
-#else
-#define __CRC_SYMBOL(sym, sec)						\
-	asm("	.section \"___kcrctab" sec "+" #sym "\", \"a\"	\n"	\
-	    "	.weak	__crc_" #sym "				\n"	\
-	    "	.long	__crc_" #sym "				\n"	\
-	    "	.previous					\n")
-#endif
-#else
-#define __CRC_SYMBOL(sym, sec)
-#endif
-
 #ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
 #include <linux/compiler.h>
 /*
@@ -85,7 +73,6 @@  struct kernel_symbol {
 /*
  * For every exported symbol, do the following:
  *
- * - If applicable, place a CRC entry in the __kcrctab section.
  * - Put the name of the symbol and namespace (empty string "" for none) in
  *   __ksymtab_strings.
  * - Place a struct kernel_symbol entry in the __ksymtab section.
@@ -98,7 +85,6 @@  struct kernel_symbol {
 	extern typeof(sym) sym;							\
 	extern const char __kstrtab_##sym[];					\
 	extern const char __kstrtabns_##sym[];					\
-	__CRC_SYMBOL(sym, sec);							\
 	asm("	.section \"__ksymtab_strings\",\"aMS\",%progbits,1	\n"	\
 	    "__kstrtab_" #sym ":					\n"	\
 	    "	.asciz 	\"" #sym "\"					\n"	\
diff --git a/init/Kconfig b/init/Kconfig
index ddcbefe535e9..f5b14318dfcb 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -2136,10 +2136,6 @@  config ASM_MODVERSIONS
 	  assembly. This can be enabled only when the target architecture
 	  supports it.
 
-config MODULE_REL_CRCS
-	bool
-	depends on MODVERSIONS
-
 config MODULE_SRCVERSION_ALL
 	bool "Source checksum for all modules"
 	help
diff --git a/kernel/module.c b/kernel/module.c
index 6cea788fd965..c9e2342da28e 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1231,11 +1231,6 @@  static int try_to_force_load(struct module *mod, const char *reason)
 
 #ifdef CONFIG_MODVERSIONS
 
-static u32 resolve_rel_crc(const s32 *crc)
-{
-	return *(u32 *)((void *)crc + *crc);
-}
-
 static int check_version(const struct load_info *info,
 			 const char *symname,
 			 struct module *mod,
@@ -1264,10 +1259,7 @@  static int check_version(const struct load_info *info,
 		if (strcmp(versions[i].name, symname) != 0)
 			continue;
 
-		if (IS_ENABLED(CONFIG_MODULE_REL_CRCS))
-			crcval = resolve_rel_crc(crc);
-		else
-			crcval = *crc;
+		crcval = *crc;
 		if (versions[i].crc == crcval)
 			return 1;
 		pr_debug("Found checksum %X vs module %lX\n",
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index a1023868775f..ddd9080fc028 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -128,7 +128,6 @@  $(obj)/%.i: $(src)/%.c FORCE
 
 genksyms = scripts/genksyms/genksyms		\
 	$(if $(1), -T $(2))			\
-	$(if $(CONFIG_MODULE_REL_CRCS), -R)	\
 	$(if $(KBUILD_PRESERVE), -p)		\
 	-r $(or $(wildcard $(2:.symtypes=.symref)), /dev/null)
 
@@ -162,19 +161,11 @@  ifdef CONFIG_MODVERSIONS
 # o if <file>.o doesn't contain a __ksymtab version, i.e. does
 #   not export symbols, it's done.
 # o otherwise, we calculate symbol versions using the good old
-#   genksyms on the preprocessed source and postprocess them in a way
-#   that they are usable as a linker script
-# o generate .tmp_<file>.o from <file>.o using the linker to
-#   replace the unresolved symbols __crc_exported_symbol with
-#   the actual value of the checksum generated by genksyms
-# o remove .tmp_<file>.o to <file>.o
+#   genksyms on the preprocessed source and dump them into the .cmd file.
+# o modpost will extract versions from that file and create *.c files that will
+#   be compiled and linked to the kernel and/or modules.
 
-# Generate .o.symversions files for each .o with exported symbols, and link these
-# to the kernel and/or modules at the end.
-
-genksyms_format_rel_crc := [^_]*__crc_\([^ ]*\) = \.; LONG(\([^)]*\)).*
-genksyms_format_normal := __crc_\(.*\) = \(.*\);
-genksyms_format := $(if $(CONFIG_MODULE_REL_CRCS),$(genksyms_format_rel_crc),$(genksyms_format_normal))
+genksyms_format := __crc_\(.*\) = \(.*\);
 
 gen_symversions =								\
 	if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then			\
@@ -188,12 +179,6 @@  gen_symversions =								\
 
 cmd_gen_symversions_c =	$(call gen_symversions,c)
 
-cmd_modversions =								\
-	if [ -r $@.symversions ]; then						\
-		$(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ 		\
-			-T $@.symversions;					\
-		mv -f $(@D)/.tmp_$(@F) $@;					\
-	fi
 endif
 
 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
@@ -273,7 +258,6 @@  define rule_cc_o_c
 	$(call cmd,checkdoc)
 	$(call cmd,gen_objtooldep)
 	$(call cmd,gen_symversions_c)
-	$(if $(CONFIG_LTO_CLANG),,$(call cmd,modversions))
 	$(call cmd,record_mcount)
 endef
 
@@ -282,7 +266,6 @@  define rule_as_o_S
 	$(call cmd,gen_ksymdeps)
 	$(call cmd,gen_objtooldep)
 	$(call cmd,gen_symversions_S)
-	$(call cmd,modversions)
 endef
 
 # Built-in and composite module parts
@@ -296,8 +279,6 @@  ifneq ($(CONFIG_LTO_CLANG)$(CONFIG_X86_KERNEL_IBT),)
 quiet_cmd_cc_prelink_modules = LD [M]  $@
       cmd_cc_prelink_modules =						\
 	$(LD) $(ld_flags) -r -o $@					\
-               $(shell [ -s $(@:.prelink.o=.o.symversions) ] &&		\
-                       echo -T $(@:.prelink.o=.o.symversions))		\
 		--whole-archive $(filter-out FORCE,$^)			\
 		$(cmd_objtool)
 
diff --git a/scripts/genksyms/genksyms.c b/scripts/genksyms/genksyms.c
index 4827c5abe5b7..6e6933ae7911 100644
--- a/scripts/genksyms/genksyms.c
+++ b/scripts/genksyms/genksyms.c
@@ -33,7 +33,7 @@  char *cur_filename;
 int in_source_file;
 
 static int flag_debug, flag_dump_defs, flag_reference, flag_dump_types,
-	   flag_preserve, flag_warnings, flag_rel_crcs;
+	   flag_preserve, flag_warnings;
 
 static int errors;
 static int nsyms;
@@ -681,10 +681,7 @@  void export_symbol(const char *name)
 			fputs(">\n", debugfile);
 
 		/* Used as a linker script. */
-		printf(!flag_rel_crcs ? "__crc_%s = 0x%08lx;\n" :
-		       "SECTIONS { .rodata : ALIGN(4) { "
-		       "__crc_%s = .; LONG(0x%08lx); } }\n",
-		       name, crc);
+		printf("__crc_%s = 0x%08lx;\n", name, crc);
 	}
 }
 
@@ -733,7 +730,6 @@  static void genksyms_usage(void)
 	      "  -q, --quiet           Disable warnings (default)\n"
 	      "  -h, --help            Print this message\n"
 	      "  -V, --version         Print the release version\n"
-	      "  -R, --relative-crc    Emit section relative symbol CRCs\n"
 #else				/* __GNU_LIBRARY__ */
 	      "  -s                    Select symbol prefix\n"
 	      "  -d                    Increment the debug level (repeatable)\n"
@@ -745,7 +741,6 @@  static void genksyms_usage(void)
 	      "  -q                    Disable warnings (default)\n"
 	      "  -h                    Print this message\n"
 	      "  -V                    Print the release version\n"
-	      "  -R                    Emit section relative symbol CRCs\n"
 #endif				/* __GNU_LIBRARY__ */
 	      , stderr);
 }
@@ -766,14 +761,13 @@  int main(int argc, char **argv)
 		{"preserve", 0, 0, 'p'},
 		{"version", 0, 0, 'V'},
 		{"help", 0, 0, 'h'},
-		{"relative-crc", 0, 0, 'R'},
 		{0, 0, 0, 0}
 	};
 
-	while ((o = getopt_long(argc, argv, "s:dwqVDr:T:phR",
+	while ((o = getopt_long(argc, argv, "s:dwqVDr:T:ph",
 				&long_opts[0], NULL)) != EOF)
 #else				/* __GNU_LIBRARY__ */
-	while ((o = getopt(argc, argv, "s:dwqVDr:T:phR")) != EOF)
+	while ((o = getopt(argc, argv, "s:dwqVDr:T:ph")) != EOF)
 #endif				/* __GNU_LIBRARY__ */
 		switch (o) {
 		case 'd':
@@ -813,9 +807,6 @@  int main(int argc, char **argv)
 		case 'h':
 			genksyms_usage();
 			return 0;
-		case 'R':
-			flag_rel_crcs = 1;
-			break;
 		default:
 			genksyms_usage();
 			return 1;
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index eceb3ee7ec06..6aee2401f3ad 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -88,11 +88,6 @@  modpost_link()
 		gen_initcalls
 		lds="-T .tmp_initcalls.lds"
 
-		if is_enabled CONFIG_MODVERSIONS; then
-			gen_symversions
-			lds="${lds} -T .tmp_symversions.lds"
-		fi
-
 		# This might take a while, so indicate that we're doing
 		# an LTO link
 		info LTO ${1}
@@ -183,6 +178,10 @@  vmlinux_link()
 		libs="${KBUILD_VMLINUX_LIBS}"
 	fi
 
+	if is_enabled CONFIG_MODULES; then
+		objs="${objs} .vmlinux.export.o"
+	fi
+
 	if [ "${SRCARCH}" = "um" ]; then
 		wl=-Wl,
 		ld="${CC}"
@@ -312,6 +311,7 @@  cleanup()
 	rm -f vmlinux.o
 	rm -f .vmlinux.d
 	rm -f .vmlinux.objs
+	rm -f .vmlinux.export.c
 }
 
 # Use "make V=1" to debug this script
@@ -373,6 +373,14 @@  if is_enabled CONFIG_DEBUG_INFO_BTF; then
 	fi
 fi
 
+if is_enabled CONFIG_MODULES; then
+	info CC .vmlinux.export.c
+	${CC} ${NOSTDINC_FLAGS} ${LINUXINCLUDE} \
+	      ${KBUILD_CPPFLAGS} ${KBUILD_CFLAGS} \
+	      ${KBUILD_CFLAGS_KERNEL} ${CFLAGS_KERNEL} \
+	      -c -o .vmlinux.export.o .vmlinux.export.c
+fi
+
 kallsymso=""
 kallsymso_prev=""
 kallsyms_vmlinux=""
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 54f957952723..b46653d46e3d 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -1040,6 +1040,7 @@  static void add_header(struct buffer *b, struct module *mod)
 	buf_printf(b, "#define INCLUDE_VERMAGIC\n");
 	buf_printf(b, "#include <linux/build-salt.h>\n");
 	buf_printf(b, "#include <linux/elfnote-lto.h>\n");
+	buf_printf(b, "#include <linux/export-internal.h>\n");
 	buf_printf(b, "#include <linux/vermagic.h>\n");
 	buf_printf(b, "#include <linux/compiler.h>\n");
 	buf_printf(b, "\n");
@@ -1074,20 +1075,26 @@  static void add_header(struct buffer *b, struct module *mod)
 		buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
 }
 
-static void check_symversions(struct module *mod)
+static void add_exported_symbols(struct buffer *buf, struct module *mod)
 {
 	struct symbol *sym;
 
 	if (!modversions)
 		return;
 
+	/* record CRCs for exported symbols */
+	buf_printf(buf, "\n");
 	list_for_each_entry(sym, &mod->exported_symbols, list) {
 		if (!sym->crc_valid) {
 			warn("EXPORT symbol \"%s\" [%s%s] version generation failed, symbol will not be versioned.\n"
 			     "Is \"%s\" prototyped in <asm/asm-prototypes.h>?\n",
 			     sym->name, mod->name, mod->is_vmlinux ? "" : ".ko",
 			     sym->name);
+			continue;
 		}
+
+		buf_printf(buf, "SYMBOL_CRC(%s, 0x%08x, \"%s\");\n",
+			   sym->name, sym->crc, sym->is_gpl_only ? "_gpl" : "");
 	}
 }
 
@@ -1224,6 +1231,18 @@  static void write_if_changed(struct buffer *b, const char *fname)
 	write_buf(b, fname);
 }
 
+static void write_vmlinux_export_c_file(struct module *mod)
+{
+	struct buffer buf = { };
+
+	buf_printf(&buf,
+		   "#include <linux/export-internal.h>\n");
+
+	add_exported_symbols(&buf, mod);
+	write_if_changed(&buf, ".vmlinux.export.c");
+	free(buf.p);
+}
+
 /* do sanity checks, and generate *.mod.c file */
 static void write_mod_c_file(struct module *mod)
 {
@@ -1235,6 +1254,7 @@  static void write_mod_c_file(struct module *mod)
 	check_exports(mod);
 
 	add_header(&buf, mod);
+	add_exported_symbols(&buf, mod);
 	add_versions(&buf, mod);
 	add_depends(&buf, mod);
 	add_moddevtable(&buf, mod);
@@ -1432,9 +1452,9 @@  int main(int argc, char **argv)
 		if (mod->from_dump)
 			continue;
 
-		check_symversions(mod);
-
-		if (!mod->is_vmlinux)
+		if (mod->is_vmlinux)
+			write_vmlinux_export_c_file(mod);
+		else
 			write_mod_c_file(mod);
 	}