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Message-ID: <20241121204220.2378181-37-samitolvanen@google.com>
Date: Thu, 21 Nov 2024 20:42:38 +0000
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Masahiro Yamada <masahiroy@...nel.org>, Luis Chamberlain <mcgrof@...nel.org>,
Miguel Ojeda <ojeda@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Matthew Maurer <mmaurer@...gle.com>, Alex Gaynor <alex.gaynor@...il.com>,
Gary Guo <gary@...yguo.net>, Petr Pavlu <petr.pavlu@...e.com>,
Daniel Gomez <da.gomez@...sung.com>, Neal Gompa <neal@...pa.dev>, Hector Martin <marcan@...can.st>,
Janne Grunau <j@...nau.net>, Miroslav Benes <mbenes@...e.cz>, Asahi Linux <asahi@...ts.linux.dev>,
Sedat Dilek <sedat.dilek@...il.com>, linux-kbuild@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-modules@...r.kernel.org,
rust-for-linux@...r.kernel.org, Sami Tolvanen <samitolvanen@...gle.com>
Subject: [PATCH v6 17/18] kbuild: Add gendwarfksyms as an alternative to genksyms
When MODVERSIONS is enabled, allow selecting gendwarfksyms as the
implementation, but default to genksyms.
Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
---
kernel/module/Kconfig | 25 ++++++++++++++++++++++++-
scripts/Makefile | 2 +-
scripts/Makefile.build | 35 +++++++++++++++++++++++++++++------
3 files changed, 54 insertions(+), 8 deletions(-)
diff --git a/kernel/module/Kconfig b/kernel/module/Kconfig
index f9e5f82fa88b..e6b2427e5c19 100644
--- a/kernel/module/Kconfig
+++ b/kernel/module/Kconfig
@@ -169,13 +169,36 @@ config MODVERSIONS
make them incompatible with the kernel you are running. If
unsure, say N.
+choice
+ prompt "Module versioning implementation"
+ depends on MODVERSIONS
+ default GENKSYMS
+ help
+ Select the tool used to calculate symbol versions for modules.
+
+ If unsure, select GENKSYMS.
+
+config GENKSYMS
+ bool "genksyms (from source code)"
+ help
+ Calculate symbol versions from pre-processed source code using
+ genksyms.
+
+ If unsure, say Y.
+
config GENDWARFKSYMS
- bool
+ bool "gendwarfksyms (from debugging information)"
depends on DEBUG_INFO
# Requires full debugging information, split DWARF not supported.
depends on !DEBUG_INFO_REDUCED && !DEBUG_INFO_SPLIT
# Requires ELF object files.
depends on !LTO
+ help
+ Calculate symbol versions from DWARF debugging information using
+ gendwarfksyms. Requires DEBUG_INFO to be enabled.
+
+ If unsure, say N.
+endchoice
config ASM_MODVERSIONS
bool
diff --git a/scripts/Makefile b/scripts/Makefile
index d7fec46d38c0..8533f4498885 100644
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -53,7 +53,7 @@ hostprogs += unifdef
targets += module.lds
subdir-$(CONFIG_GCC_PLUGINS) += gcc-plugins
-subdir-$(CONFIG_MODVERSIONS) += genksyms
+subdir-$(CONFIG_GENKSYMS) += genksyms
subdir-$(CONFIG_GENDWARFKSYMS) += gendwarfksyms
subdir-$(CONFIG_SECURITY_SELINUX) += selinux
subdir-$(CONFIG_SECURITY_IPE) += ipe
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index f41ce2131979..d6b211a7b261 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -107,13 +107,24 @@ cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
$(obj)/%.i: $(obj)/%.c FORCE
$(call if_changed_dep,cpp_i_c)
+getexportsymbols = $(NM) $@ | sed -n 's/.* __export_symbol_\(.*\)/$(1)/p'
+
+gendwarfksyms = $(objtree)/scripts/gendwarfksyms/gendwarfksyms \
+ $(if $(KBUILD_SYMTYPES), --symtypes $(@:.o=.symtypes)) \
+ $(if $(KBUILD_GENDWARFKSYMS_STABLE), --stable)
+
genksyms = $(objtree)/scripts/genksyms/genksyms \
$(if $(KBUILD_SYMTYPES), -T $(@:.o=.symtypes)) \
$(if $(KBUILD_PRESERVE), -p) \
$(addprefix -r , $(wildcard $(@:.o=.symref)))
# These mirror gensymtypes_S and co below, keep them in synch.
+ifdef CONFIG_GENDWARFKSYMS
+cmd_gensymtypes_c = $(if $(skip_gendwarfksyms),, \
+ $(call getexportsymbols,\1) | $(gendwarfksyms) $@)
+else
cmd_gensymtypes_c = $(CPP) -D__GENKSYMS__ $(c_flags) $< | $(genksyms)
+endif # CONFIG_GENDWARFKSYMS
# LLVM assembly
# Generate .ll files from .c
@@ -279,14 +290,26 @@ $(obj)/%.ll: $(obj)/%.rs FORCE
# This is convoluted. The .S file must first be preprocessed to run guards and
# expand names, then the resulting exports must be constructed into plain
# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
-# to make the genksyms input.
+# to make the genksyms input or compiled into an object for gendwarfksyms.
#
# These mirror gensymtypes_c and co above, keep them in synch.
-cmd_gensymtypes_S = \
- { echo "\#include <linux/kernel.h>" ; \
- echo "\#include <asm/asm-prototypes.h>" ; \
- $(NM) $@ | sed -n 's/.* __export_symbol_\(.*\)/EXPORT_SYMBOL(\1);/p' ; } | \
- $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | $(genksyms)
+getasmexports = \
+ { echo "\#include <linux/kernel.h>" ; \
+ echo "\#include <linux/string.h>" ; \
+ echo "\#include <asm/asm-prototypes.h>" ; \
+ $(call getexportsymbols,EXPORT_SYMBOL(\1);) ; }
+
+ifdef CONFIG_GENDWARFKSYMS
+cmd_gensymtypes_S = \
+ $(getasmexports) | \
+ $(CC) $(c_flags) -c -o $(@:.o=.gendwarfksyms.o) -xc -; \
+ $(call getexportsymbols,\1) | \
+ $(gendwarfksyms) $(@:.o=.gendwarfksyms.o)
+else
+cmd_gensymtypes_S = \
+ $(getasmexports) | \
+ $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | $(genksyms)
+endif # CONFIG_GENDWARFKSYMS
quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
--
2.47.0.371.ga323438b13-goog
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