Re: [BUG] alpha: module xxx: Unknown relocation: 1

[Michael Cree <mcree@orcon.net.nz>]

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On Wed, Apr 12, 2017 at 07:57:52AM +0200, Helge Deller wrote:
> On 12.04.2017 04:59, Bob Tracy wrote:
> > Bottom line is, no kernel I've built since 4.9 can load a module.  All
> > attempts to load a module result in the error message emitted by
> > "arch/alpha/kernel/module.c" as follows:
> > 
> > module XXX: Unknown relocation: 1
> > 
> 
> I assume it's due this commmit "modversions: treat symbol CRCs as 32 bit quantities":
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=71810db27c1c853b335675bee335d893bc3d324b
> 
> For parisc this patch solves it:
> parisc: support R_PARISC_SECREL32 relocation in modules
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5f655322b1ba4bd46e26e307d04098f9c84df764
> 
> > module XXX: Unknown relocation: 1
> 
> For alpha it seems you need to add similar code to handle R_ALPHA_REFLONG
> to apply_relocate_add() in arch/alpha/kernel/module.c

Would the attached patch fix it?  Untested because I don't see the
above issue.

Cheers
Michael.

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diff --git a/arch/alpha/kernel/module.c b/arch/alpha/kernel/module.c
index 936bc8f89a67..47632fa8c24e 100644
--- a/arch/alpha/kernel/module.c
+++ b/arch/alpha/kernel/module.c
@@ -181,6 +181,9 @@ apply_relocate_add(Elf64_Shdr *sechdrs, const char *strtab,
 		switch (r_type) {
 		case R_ALPHA_NONE:
 			break;
+		case R_ALPHA_REFLONG:
+			*(u32 *)location = value;
+			break;
 		case R_ALPHA_REFQUAD:
 			/* BUG() can produce misaligned relocations. */
 			((u32 *)location)[0] = value;