linux-kernel - Re: [REGRESSION] um: CONFIG_STATIC

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Date:	Tue, 22 Dec 2009 02:10:06 +0100
From:	richard -rw- weinberger <richard.weinberger@...il.com>
To:	Tim Abbott <tabbott@...lice.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] um: CONFIG_STATIC_LINK=y broken

Adding the ALIGN(PAGE_SIZE) causes the segfault.
But I cannot tell you why. :-(

Cheers,
//richard

2009/12/22, Tim Abbott <tabbott@...lice.com>:
> On Tue, 22 Dec 2009, richard -rw- weinberger wrote:
>
>> This is the bad changeset:
>
> Thanks for tracking that down.  INIT_TEXT_SECTION is:
>
> #define INIT_TEXT_SECTION(inittext_align)                               \
>         . = ALIGN(inittext_align);                                      \
>         .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) {               \
>                 VMLINUX_SYMBOL(_sinittext) = .;                         \
>                 INIT_TEXT                                               \
>                 VMLINUX_SYMBOL(_einittext) = .;                         \
>         }
>
> So there are only 3 code changes here:
> (1) wrapping _sinittext and _einittext in VMLINUX_SYMBOL
> (2) Adding the AT(ADDR(.init.text) - LOAD_OFFSET)
> (3) The added ALIGN(PAGE_SIZE) before the start of .init.text.
>
> I don't yet see why any of these would be problematic; would you be
> willing to try them and figure out the precise cause?
>
> I suspect it'd be easiest for you to try those individual changes
> interactively, but if it's not trivial for you, I'd be happy to generate a
> patch series splitting out this change into pieces for you to bisect.
>
> 	-Tim Abbott
>
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