linux-kernel - Re: [PATCH 05/10] kbuild: sort the list of symbols exported by the kernel (_

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Message-ID: <20091123195320.GD26810@ldl.fc.hp.com>
Date:	Mon, 23 Nov 2009 12:53:20 -0700
From:	Alex Chiang <achiang@...com>
To:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
Cc:	Tony Luck <tony.luck@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Sam Ravnborg <sam@...nborg.org>,
	Mike Frysinger <vapier.adi@...il.com>, greg@...ah.com,
	linux-kbuild@...r.kernel.org, carmelo73@...il.com,
	linux-kernel@...r.kernel.org, kyle@...artin.ca, deller@....de,
	jejb@...isc-linux.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	paulus@...ba.org
Subject: Re: [PATCH 05/10] kbuild: sort the list of symbols exported by the
	kernel (__ksymtab)

Hi Alan, Rusty,

* Alan Jenkins <alan-jenkins@...fmail.co.uk>:
> Tony Luck wrote:
>> The sorted ksymtab breaks ia64 (and possibly ppc64 and
>> parisc too).

[snip]

>> The syntax you need for this* is:
>>
>>         .long @fptr(____pagevec_lru_add)
>>         .long __kstrtab____pagevec_lru_add
>>
>> Note that you must only use the @fptr(name) syntax for
>> function exports. Exported data items just need an address.
>>
>> -Tony
>>
>> * On ia64 ... powerpc and parisc might need something else.
>>   
> Thanks!  It doesn't sound too hard to retro-fit your suggestion.
>
> Still, I can't help wondering if I've done this all wrong :-/.  Perhaps  
> I should avoid the assembler.  Instead, I could write a tool to sort the  
> ksymtab elf sections in-place (and mangle their relocations  
> accordingly).  That should preserve any special handling for function  
> symbols without arch-specific special cases.  It would also concentrate  
> all the magic in one tool - rather than it being scattered between the  
> modpost tool, mod_export.h, tmp_exports.S, and vmlinux.lds.h.

In the meantime, while Alan is deciding the proper way to fix
this, would it be possible to drop the offending patch series
from linux-next?

It makes ia64 unbootable, and has ripple-through effects, since
mmotm is based on linux-next these days.

Thanks,
/ac

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