Make most arch asm/module.h files use asm-generic/module.h

Use the mapping of Elf_[SPE]hdr, Elf_Addr, Elf_Sym, Elf_Dyn, Elf_Rel/Rela,
ELF_R_TYPE() and ELF_R_SYM() to either the 32-bit version or the 64-bit version
into asm-generic/module.h for all arches bar MIPS.

Also, use the generic definition mod_arch_specific where possible.

To this end, I've defined three new config bools:

 (*) HAVE_MOD_ARCH_SPECIFIC

     Arches define this if they don't want to use the empty generic
     mod_arch_specific struct.

 (*) MODULES_USE_ELF_RELA

     Arches define this if their modules can contain RELA records.  This causes
     the Elf_Rela mapping to be emitted and allows apply_relocate_add() to be
     defined by the arch rather than have the core emit an error message.

 (*) MODULES_USE_ELF_REL

     Arches define this if their modules can contain REL records.  This causes
     the Elf_Rel mapping to be emitted and allows apply_relocate() to be
     defined by the arch rather than have the core emit an error message.

Note that it is possible to allow both REL and RELA records: m68k and mips are
two arches that do this.

With this, some arch asm/module.h files can be deleted entirely and replaced
with a generic-y marker in the arch Kbuild file.

Additionally, I have removed the bits from m32r and score that handle the
unsupported type of relocation record as that's now handled centrally.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

2 files changed, 3 insertions, 6 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 352f416269ce..74f84781b484 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -139,6 +139,8 @@ config PPC
         select GENERIC_CLOCKEVENTS
         select GENERIC_STRNCPY_FROM_USER
         select GENERIC_STRNLEN_USER
+        select HAVE_MOD_ARCH_SPECIFIC
+        select MODULES_USE_ELF_RELA
 
 config EARLY_PRINTK
         bool
diff --git a/arch/powerpc/include/asm/module.h b/arch/powerpc/include/asm/module.h
index 0192a4ee2bc2..c1df590ec444 100644
--- a/arch/powerpc/include/asm/module.h
+++ b/arch/powerpc/include/asm/module.h
@@ -11,6 +11,7 @@
 
 #include <linux/list.h>
 #include <asm/bug.h>
+#include <asm-generic/module.h>
 
 
 #ifndef __powerpc64__
@@ -60,16 +61,10 @@ struct mod_arch_specific {
  */
 
 #ifdef __powerpc64__
-#    define Elf_Shdr    Elf64_Shdr
-#    define Elf_Sym     Elf64_Sym
-#    define Elf_Ehdr    Elf64_Ehdr
 #    ifdef MODULE
         asm(".section .stubs,\"ax\",@nobits; .align 3; .previous");
 #    endif
 #else
-#    define Elf_Shdr    Elf32_Shdr
-#    define Elf_Sym     Elf32_Sym
-#    define Elf_Ehdr    Elf32_Ehdr
 #    ifdef MODULE
         asm(".section .plt,\"ax\",@nobits; .align 3; .previous");
         asm(".section .init.plt,\"ax\",@nobits; .align 3; .previous");