Re: [MODULES] fix weak symbol handling

[Rusty Russell <rusty@rustcorp.com.au>]

In message <20030113110036.A873@twiddle.net> you write:
>  		case SHN_UNDEF:
> +			sym[i].st_value
> +			  = resolve_symbol(sechdrs, symindex, strtab,
> +					   strtab + sym[i].st_name, mod);
> +
> +			/* Ok if resolved.  */
> +			if (sym[i].st_value != 0)
> +				break;
> +			/* Ok if weak.  */
> +			if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
> +				break;
> +
> +			printk(KERN_WARNING "%s: Unknown symbol %s\n",
> +			       mod->name, strtab + sym[i].st_name);
> +			ret = -ENOENT;
>  			break;

I don't understand this.  For a weak symbol, st_shndx won't be
SHN_UNDEF.  And you don't want to set its value to 0, anyway.  I think
you want:

	default:
		if (ELF_ST_BIND(sym[i].st_info) == STB_WEAK) {
			unsigned long val = resolve_symbol(...);
			if (val)
				sym[i].st_value = val;
		} else
			...

Or am I missing something?
Rusty.
PS.  "s/Fix weak symbol handling/Implement weak symbol handling/" 8)
--
  Anyone who quotes me in their sig is an idiot. -- Rusty Russell.