The patch titled
kbuild: make it possible for the linker to discard local symbols from vmlinux
has been added to the -mm tree. Its filename is
kbuild-make-it-possible-for-the-linker-to-discard-local-symbols-from-vmlinux.patch
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------------------------------------------------------
Subject: kbuild: make it possible for the linker to discard local symbols from vmlinux
From: David Howells <dhowells@xxxxxxxxxx>
Make it possible for the linker to discard local symbols from vmlinux as
they cause vmlinux to balloon when CONFIG_KALLSYMS=y and they cause
dump_stack() and get_wchan() to produce useless information under some
circumstances.
With this we add a config option (CONFIG_STRIP_ASM_SYMS) that will cause
the build to supply -X to the linker to tell it to strip temporary local
symbols.
This doesn't seem to cause gdb any problems.
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Makefile | 4 ++++
init/Kconfig | 8 ++++++++
2 files changed, 12 insertions(+)
diff -puN Makefile~kbuild-make-it-possible-for-the-linker-to-discard-local-symbols-from-vmlinux Makefile
--- a/Makefile~kbuild-make-it-possible-for-the-linker-to-discard-local-symbols-from-vmlinux
+++ a/Makefile
@@ -591,6 +591,10 @@ LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma
LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
+ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
+LDFLAGS_vmlinux += -X
+endif
+
# Default kernel image to build when no specific target is given.
# KBUILD_IMAGE may be overruled on the command line or
# set in the environment
diff -puN init/Kconfig~kbuild-make-it-possible-for-the-linker-to-discard-local-symbols-from-vmlinux init/Kconfig
--- a/init/Kconfig~kbuild-make-it-possible-for-the-linker-to-discard-local-symbols-from-vmlinux
+++ a/init/Kconfig
@@ -737,6 +737,14 @@ config KALLSYMS_EXTRA_PASS
you wait for kallsyms to be fixed.
+config STRIP_ASM_SYMS
+ bool "Strip assembler-generated symbols during link"
+ default n
+ help
+ Strip internal assembler-generated symbols during a link (symbols
+ that look like '.Lxxx') so they don't pollute the output of
+ get_wchan() and suchlike.
+
config HOTPLUG
bool "Support for hot-pluggable devices" if EMBEDDED
default y
_
Patches currently in -mm which might be from dhowells@xxxxxxxxxx are
origin.patch
linux-next.patch
kbuild-make-it-possible-for-the-linker-to-discard-local-symbols-from-vmlinux.patch
nommu-fix-a-number-of-issues-with-the-per-mm-vma-patch.patch
frv-duplicate-output_buffer-of-e03.patch
nommu-present-backing-device-capabilities-for-mtd-chardevs.patch
nommu-add-support-for-direct-mapping-through-mtdconcat-if-possible.patch
nommu-make-it-possible-for-romfs-to-use-mtd-devices-directly.patch
mtd-fix-a-bad-dependency-in-the-blackfin-code.patch
bin_elf_fdpic-check-the-return-value-of-clear_user.patch
mutex-subsystem-synchro-test-module.patch
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