Commit b92021b0 authored by Rusty Russell's avatar Rusty Russell
Browse files

CONFIG_SYMBOL_PREFIX: cleanup. 



We have CONFIG_SYMBOL_PREFIX, which three archs define to the string
"_".  But Al Viro broke this in "consolidate cond_syscall and
SYSCALL_ALIAS declarations" (in linux-next), and he's not the first to
do so.

Using CONFIG_SYMBOL_PREFIX is awkward, since we usually just want to
prefix it so something.  So various places define helpers which are
defined to nothing if CONFIG_SYMBOL_PREFIX isn't set:

1) include/asm-generic/unistd.h defines __SYMBOL_PREFIX.
2) include/asm-generic/vmlinux.lds.h defines VMLINUX_SYMBOL(sym)
3) include/linux/export.h defines MODULE_SYMBOL_PREFIX.
4) include/linux/kernel.h defines SYMBOL_PREFIX (which differs from #7)
5) kernel/modsign_certificate.S defines ASM_SYMBOL(sym)
6) scripts/modpost.c defines MODULE_SYMBOL_PREFIX
7) scripts/Makefile.lib defines SYMBOL_PREFIX on the commandline if
   CONFIG_SYMBOL_PREFIX is set, so that we have a non-string version
   for pasting.

(arch/h8300/include/asm/linkage.h defines SYMBOL_NAME(), too).

Let's solve this properly:
1) No more generic prefix, just CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX.
2) Make linux/export.h usable from asm.
3) Define VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR().
4) Make everyone use them.

Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
Reviewed-by: default avatarJames Hogan <james.hogan@imgtec.com>
Tested-by: James Hogan <james.hogan@imgtec.com> (metag)
parent 4febd95a

Makefile

+1 −1
Original line number Diff line number Diff line
@@ -1398,7 +1398,7 @@ quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)) 
# Run depmod only if we have System.map and depmod is executable

quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)

      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \

                   $(KERNELRELEASE) "$(patsubst "%",%,$(CONFIG_SYMBOL_PREFIX))"

                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"



# Create temporary dir for module support files

# clean it up only when building all modules

arch/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -384,6 +384,12 @@ config MODULES_USE_ELF_REL 
	  Modules only use ELF REL relocations.  Modules with ELF RELA

	  relocations will give an error.



config HAVE_UNDERSCORE_SYMBOL_PREFIX

	bool

	help

	  Some architectures generate an _ in front of C symbols; things like

	  module loading and assembly files need to know about this.



#

# ABI hall of shame

#

arch/blackfin/Kconfig

+1 −4
Original line number Diff line number Diff line 
config SYMBOL_PREFIX

	string

	default "_"



config MMU

	def_bool n
@@ -33,6 +29,7 @@ config BLACKFIN 
	select ARCH_HAVE_CUSTOM_GPIO_H

	select ARCH_WANT_OPTIONAL_GPIOLIB

	select HAVE_UID16

	select HAVE_UNDERSCORE_SYMBOL_PREFIX

	select VIRT_TO_BUS

	select ARCH_WANT_IPC_PARSE_VERSION

	select HAVE_GENERIC_HARDIRQS

arch/h8300/Kconfig

+1 −4
Original line number Diff line number Diff line
@@ -12,10 +12,7 @@ config H8300 
	select MODULES_USE_ELF_RELA

	select OLD_SIGSUSPEND3

	select OLD_SIGACTION



config SYMBOL_PREFIX

	string

	default "_"

	select HAVE_UNDERSCORE_SYMBOL_PREFIX



config MMU

	bool

arch/metag/Kconfig

+1 −4
Original line number Diff line number Diff line 
config SYMBOL_PREFIX

	string

	default "_"



config METAG

	def_bool y

	select EMBEDDED
@@ -27,6 +23,7 @@ config METAG 
	select HAVE_MOD_ARCH_SPECIFIC

	select HAVE_PERF_EVENTS

	select HAVE_SYSCALL_TRACEPOINTS

	select HAVE_UNDERSCORE_SYMBOL_PREFIX

	select IRQ_DOMAIN

	select MODULES_USE_ELF_RELA

	select OF

CRA Git | Maintained and supported by SUSTech CRA and CCSE