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authorMasahiro Yamada <masahiroy@kernel.org>2022-05-13 20:39:22 +0900
committerMasahiro Yamada <masahiroy@kernel.org>2022-05-24 16:33:20 +0900
commit7b4537199a4a8480b8c3ba37a2d44765ce76cd9b (patch)
tree0690afa62208ca15fd36069afcbdac85908d0676 /arch
parentf292d875d0dc700b3af0bef04c5abc1dc7b3b62c (diff)
kbuild: link symbol CRCs at final link, removing CONFIG_MODULE_REL_CRCS
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> Tested-by: Nicolas Schier <nicolas@fjasle.eu> Reviewed-by: Nicolas Schier <nicolas@fjasle.eu> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # LLVM-14 (x86-64)
Diffstat (limited to 'arch')
-rw-r--r--arch/m68k/include/asm/Kbuild1
-rw-r--r--arch/m68k/include/asm/export.h2
-rw-r--r--arch/powerpc/Kconfig1
-rw-r--r--arch/s390/Kconfig1
-rw-r--r--arch/um/Kconfig1
5 files changed, 1 insertions, 5 deletions
diff --git a/arch/m68k/include/asm/Kbuild b/arch/m68k/include/asm/Kbuild
index 0dbf9c5c6fae..1b720299deb1 100644
--- a/arch/m68k/include/asm/Kbuild
+++ b/arch/m68k/include/asm/Kbuild
@@ -1,5 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
generated-y += syscall_table.h
+generic-y += export.h
generic-y += extable.h
generic-y += kvm_para.h
generic-y += mcs_spinlock.h
diff --git a/arch/m68k/include/asm/export.h b/arch/m68k/include/asm/export.h
deleted file mode 100644
index b53008b67ce1..000000000000
--- a/arch/m68k/include/asm/export.h
+++ /dev/null
@@ -1,2 +0,0 @@
-#define KCRC_ALIGN 2
-#include <asm-generic/export.h>
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