linux-kernel - Re: [PATCH 9/10] sh: Use struct syscore_ops instead of sysdev class and sysdev

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 22 Mar 2011 23:04:20 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	"R. J. Wysocki" <Rafal.Wysocki@....edu.pl>,
	LKML <linux-kernel@...r.kernel.org>, Greg KH <gregkh@...e.de>,
	Kay Sievers <kay.sievers@...e.de>,
	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	Russell King <linux@....linux.org.uk>,
	Magnus Damm <magnus.damm@...il.com>, linux-sh@...r.kernel.org
Subject: Re: [PATCH 9/10] sh: Use struct syscore_ops instead of sysdev class and sysdev

On Sat, Mar 19, 2011 at 01:47:27AM +0100, Rafael J. Wysocki wrote:
> On Thursday, March 17, 2011, Paul Mundt wrote:
> > On Sun, Mar 13, 2011 at 02:03:49PM +0100, R. J. Wysocki wrote:
> > > From: Rafael J. Wysocki <rjw@...k.pl>
> > > 
> > > Convert the SuperH clocks framework and shared interrupt handling
> > > code to using struct syscore_ops instead of a sysdev classes and
> > > sysdevs for power managment.
> > > 
> > > This reduces the code size significantly and simplifies it.  The
> > > optimizations causing things not to be restored after creating a
> > > hibernation image are removed, but they might lead to undesirable
> > > effects during resume from hibernation (e.g. the clocks would be left
> > > as the boot kernel set them, which might be not the same way as the
> > > hibernated kernel had seen them before the hibernation).
> > > 
> > > This also is necessary for removing sysdevs from the kernel entirely
> > > in the future.
> > > 
> > > Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> > 
> > This misses the use of the sysdev class by the userimask code, though I'm
> > open to suggestions for alternatives.
> 
> For now, I'd simply move the sysdev class definition to userimask.c, like
> in the patch below.  The current goal is to eliminate the suspend/resume and
> shutdown operations from sysdevs (and sysdev drivers), the next step will
> be to replace the remaining sysdevs with alternative mechanisms.
> 
It's not quite that straightforward, you've also killed off the name
attribute for each of the intc sysdevs, so we no longer have a visible
way to map a given intc controller number to the controller name in a
user visible way.

I'm not opposed to the syscore thing for suspend/resume ops, but I'm not
willing to trash the userimask and name mapping interface in the process
with no alternatives.

userimask was the first global configuration item I added, but there are
other per-controller and global configuration knobs that I plan to export
through the interface, so there really needs to be a compelling reason
for moving off of sysdevs.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/