linux-kernel - Re: [PATCH] kernel: mark all struct k

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Date:   Tue, 23 May 2017 09:01:14 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Christoph Hellwig <hch@....de>
cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kernel: mark all struct k_clock instances const

On Tue, 23 May 2017, Christoph Hellwig wrote:
> On Tue, May 23, 2017 at 12:17:31AM +0200, Thomas Gleixner wrote:
> > On Mon, 15 May 2017, Christoph Hellwig wrote:
> > 
> > > And keep a pointer to it instead of a copy in the posix_clocks array.
> > > 
> > > Based on similar changes in the Grsecurity patchset, but redone from
> > > scratch including a few tweaks.
> > 
> > Hmm, that adds another level of indirection, but yes, we can do it.
> > 
> > > diff --git a/drivers/char/mmtimer.c b/drivers/char/mmtimer.c
> > > index 0e7fcb04f01e..e501403dd860 100644
> > > --- a/drivers/char/mmtimer.c
> > > +++ b/drivers/char/mmtimer.c
> > > @@ -53,7 +53,7 @@ MODULE_LICENSE("GPL");
> > >  
> > >  #define RTC_BITS 55 /* 55 bits for this implementation */
> > >  
> > > -static struct k_clock sgi_clock;
> > > +static const struct k_clock sgi_clock;
> > 
> > Bah. This mmtimer which is used by 3 people in the world requires that we
> > keep the register_clock() function around after init and even export it.
> 
> We can require the driver to be built into the kernel, which seems pretty
> reasonable for a timer.  It's only selectable on IA64 anyway.

That still requires that we "register" the clock as it's SN2 specific and
we don't want to end up with a non initialized clock ....

Thanks,

	tglx