linux-kernel - Re: [PATCH #repost] SCSI: megaraid, fix suspend/resume sections

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Message-Id: <1209740170.3121.24.camel@localhost.localdomain>
Date:	Fri, 02 May 2008 09:56:10 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	jirislaby@...il.com, megaraidlinux@....com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH #repost] SCSI: megaraid, fix suspend/resume sections

On Thu, 2008-05-01 at 15:30 -0700, Andrew Morton wrote: 
> On Thu, 01 May 2008 17:05:59 -0500
> James Bottomley <James.Bottomley@...senPartnership.com> wrote:
> 
> > On Thu, 2008-05-01 at 23:34 +0200, Jiri Slaby wrote:
> > > On 05/01/2008 11:23 PM, Andrew Morton wrote:
> > > > On Thu,  1 May 2008 17:56:02 +0200
> > > > Jiri Slaby <jirislaby@...il.com> wrote:
> > > > 
> > > >> megaraid_sas suspend and resume are inappropriatelly placed in
> > > >> __devinit section.
> > > > 
> > > > That's a box-killer, isn't it?
> > > 
> > > I think so -- the non-CONFIG_HOTPLUG ones.
> > 
> > CONFIG_HOTPLUG is only settable to 'n' if you're CONFIG_EMBEDDED which
> > has a zero set intersection with the users of megaraid, so in practical
> > terms, there's no actual box it could kill.
> 
> who suspends and resumes servers?

Well, IBM for one ... although you wouldn't have to try hard to convince
me that they do it just to annoy me.

> > this whole 
> > 
> > #if CONFIG_PM
> > define suspend resume
> > #else
> > set suspend resume methods to null
> > #endif
> > 
> > Is completely analagous to what we used to do with CONFIG_HOTPLUG before
> > we had the __dev.* sectional annotations.  Since the expanding
> > bureacracy is determined to keep the _dev.* sections 
> 
> ooh, that makes us sound really bad!  ("since the server-obsessed
> embedded-hating bloatmonkeys..."?)

Well, since the __dev.* sections according to the embedded folks are
worth about a page possibly two, the __dev.* value to them is minimal
(particularly as a lot of them have hotplug anyway for their compact
flash, USB and the like).

> > in spite of the pain,
> 
> What pain?  Other people write the dang patches for you!  Their main
> problem is getting them merged.

No, the problem is getting them reviewed.  Since everyone seems to have
section mismatch fatigue they all seem to land on me.

> > could we not at least make the machinery do something vaguely
> > useful and expand it to confine the pm routines to sections which can be
> > discarded if CONFIG_PM is n?
> 
> a) it would need to be discarded at link-time, ideally.

Yes, the same way the exit sections are: as linker discards.  We also
have the mechanics for runtime discards which is useful for modules

> b) worth investigating.  It might lead to lengthy chains of compilation
>    warnings though.

Yes ... but if it was worth the effort to unify all the handrolled
CONFIG_HOTPLUG stuff, it should be worth it for all the handrolled
CONFIG_PM code.

James


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