[PATCH] modpost: Fix section warnings for ARM for many compilers

From: Tony Lindgren
Date: Mon Feb 13 2012 - 16:24:13 EST


It turns out that many compilers don't show section warnings on ARM
currently because handling for ARM_CALL relocs are missing from
modpost.c.

Based on commit c2e26114 ([ARM] 3205/1: Handle new EABI relocations when
loading kernel modules) it seems that R_ARM_PC24, R_ARM_CALL and
R_ARM_JUMP24 can be handled the same way.

As modpost.c includes elf.h, we need to also consider that at least
Debian libc6-dev is missing defines for both R_ARM_CALL and R_ARM_JUMP24
in /usr/include/elf.h.

So for now let's just use the numbers in modpost.c.

Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Anders Kaseorg <andersk@xxxxxxxxxxx>
Cc: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>

---

Anybody got better ideas for dealing with the missing elf.h
defines?

--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -1505,6 +1505,8 @@ static int addend_arm_rel(struct elf_info *elf, Elf_Shdr *sechdr, Elf_Rela *r)
(elf->symtab_start + ELF_R_SYM(r->r_info));
break;
case R_ARM_PC24:
+ case 28: /* R_ARM_CALL */
+ case 29: /* R_ARM_JUMP24 */
/* From ARM ABI: ((S + A) | T) - P */
r->r_addend = (int)(long)(elf->hdr +
sechdr->sh_offset +
--
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