linux-kernel - Re: [PATCH] x86: fix improper .init-type section references

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Message-ID: <a781481a0706130039r26e9522q98d9645809136ea7@mail.gmail.com>
Date:	Wed, 13 Jun 2007 13:09:07 +0530
From:	"Satyam Sharma" <satyam.sharma@...il.com>
To:	"Jan Beulich" <jbeulich@...ell.com>
Cc:	"Sam Ravnborg" <sam@...nborg.org>,
	"Venkatesh Pallipadi" <venkatesh.pallipadi@...el.com>,
	"Andi Kleen" <ak@...e.de>, linux-kernel@...r.kernel.org,
	patches@...-64.org
Subject: Re: [PATCH] x86: fix improper .init-type section references

On 6/13/07, Jan Beulich <jbeulich@...ell.com> wrote:
> >>> Sam Ravnborg <sam@...nborg.org> 13.06.07 06:35 >>>
> >>
> >> Yup, we were only discussing possibility that modpost not complain
> >> about .init -> .exit references that will never go oops (because the arch
> >> guarantees that).
> >
> >And there are no good reasosns why the rules should be different for i386
> >and powerpc.
> >This type of special casing is always bad.
> >Think about it a little.
> >Someone writes a generic driver and test it on i386 - OK.
> >But for powerpc it result in a build failure. It would be so much better
> >to warn about this situation early.

Ok, that makes sense.

> And I didn't mean to special case it - I meant to suggest changing the semantics
> generally, which is why I gave the example of calling cleanup code (__exit)
> from error paths in startup code (__init).

i.e. don't discard anything at build time, and link the .exit.{text,
data} sections
into the kernel image for _all_ archs? (otherwise how do we avoid
special-casing/
checking for the arch in modpost and warn/not-warn about invalid/valid cases)

But then why not simply lose the __exit (and .exit.*) altogether? Because
__exit becomes redundant in the suggested changed semantics -- just mark
all the cleanup code as __init too (when it's built-in, the only
callsite for the
cleanup code would be from the startup code in .init.*, and when modular,
__init and __exit lose all relevance anyway).

Satyam
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