[patch 2.6] Relocation overflow with modules on Alpha

[Ivan Kokshaysky <ink@jurassic.park.msu.ru>]

On Mon, Jan 05, 2004 at 02:21:37AM +0100, Måns Rullgård wrote:
> I compiled Linux 2.6.0 for Alpha, and it mostly works, except the
> somewhat large modules.  They fail to load with the message
> "Relocation overflow vs section 17", or some other section number.

This failure happens with GPRELHIGH relocation, which is *signed*
short, but relocation overflow check in module.c doesn't take into
account the sign extension.
Appended patch should help.

Ivan.

--- 2.6/arch/alpha/kernel/module.c	Wed May 28 01:05:20 2003
+++ linux/arch/alpha/kernel/module.c	Mon Aug 11 23:23:02 2003
@@ -259,7 +259,7 @@ apply_relocate_add(Elf64_Shdr *sechdrs, 
 			*(u64 *)location = value;
 			break;
 		case R_ALPHA_GPRELHIGH:
-			value = (value - gp + 0x8000) >> 16;
+			value = (long)(value - gp + 0x8000) >> 16;
 			if ((short) value != value)
 				goto reloc_overflow;
 			*(u16 *)location = value;