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

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Date:	Mon, 13 Feb 2012 13:24:01 -0800
From:	Tony Lindgren <tony@...mide.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Ben Hutchings <ben@...adent.org.uk>,
	Anders Kaseorg <andersk@...lice.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: [PATCH] modpost: Fix section warnings for ARM for many compilers

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@...tcorp.com.au>
Cc: Ben Hutchings <ben@...adent.org.uk>
Cc: Anders Kaseorg <andersk@...lice.com>
Cc: Greg KH <gregkh@...uxfoundation.org>
Cc: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Tony Lindgren <tony@...mide.com>

---

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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