linux-kernel - Re: [patch] drivers: wait for threaded probes between initcall levels

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Date:	Sat, 28 Oct 2006 01:12:03 +0200 (MEST)
From:	Olaf Hering <olaf@...fle.de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Andrew Morton <akpm@...l.org>, Pavel Machek <pavel@....cz>,
	Greg KH <greg@...ah.com>,
	Stephen Hemminger <shemminger@...l.org>,
	Matthew Wilcox <matthew@....cx>, Adrian Bunk <bunk@...sta.de>,
	Linus Torvalds <torvalds@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-pci@...ey.karlin.mff.cuni.cz
Subject: Re: [patch] drivers: wait for threaded probes between initcall levels

On Fri, Oct 27, Alan Cox wrote:

> Ar Gwe, 2006-10-27 am 11:42 -0700, ysgrifennodd Andrew Morton:
> > IOW, we want to be multithreaded _within_ an initcall level, but not between
> > different levels.
> 
> Thats actually insufficient. We have link ordered init sequences in
> large numbers of driver subtrees (ATA, watchdog, etc). We'll need
> several more initcall layers to fix that.

Is it time for something better?
True dependencies, an addition to or as replacement for module_init()?
random example: hfs/super.c:
depends_on_initialized(init_hfs_fs: init_hfsplus_fs,kmem_cache_thingie,core_filesystem_thingie,foo,bar,worldpeace);
If init_hfsplus_fs() does not exist it should be no error.

Whatever the sytax will be and however its parsed during build, that link order
requirement bites every other month.
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