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Commit 5d7d18f5 authored by David Howells's avatar David Howells Committed by Sam Ravnborg
Browse files

kbuild: make it possible for the linker to discard local symbols from vmlinux 



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: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
parent 0fa3a88c

Makefile

+4 −0
Original line number Diff line number Diff line
@@ -597,6 +597,10 @@ 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

init/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -808,6 +808,14 @@ 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