linux-kernel - Re: [kbuild-devel] scripts/kallsyms: extending region checking for Blackfin memory regions

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Message-ID: <20090615043716.GA9900@uranus.ravnborg.org>
Date:	Mon, 15 Jun 2009 06:37:16 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Mike Frysinger <vapier.adi@...il.com>
Cc:	Robin Getz <rgetz@...ckfin.uclinux.org>,
	kbuild-devel@...ts.sourceforge.net,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	uclinux-dist-devel <uclinux-dist-devel@...ckfin.uclinux.org>
Subject: Re: [kbuild-devel] scripts/kallsyms: extending region checking for Blackfin memory regions

On Sun, Jun 14, 2009 at 10:05:26PM -0400, Mike Frysinger wrote:
> On Sun, Jun 14, 2009 at 21:59, Robin Getz wrote:
> > On Sun 14 Jun 2009 16:44, Sam Ravnborg pondered:
> >> On Mon, Jun 08, 2009 at 07:23:16PM -0400, Mike Frysinger wrote:
> >> > intro: the current Blackfin memory architecture is (1) no virtualized
> >> > memory and (2) distinctly harvard.  that means we cannot create a
> >> > linear map of start/end text sections.  we end up with distinct
> >> > regions like so:
> >> > 00001000 T __stext
> >> > 000dc4c0 T __etext
> >> > feb00000 A __etext_l2
> >> > feb00010 A __stext_l2
> >> > ffa00000 T __stext_l1
> >> > ffa0160c T __etext_l1
> >> > this is because external memory starts at address 0 while on-chip
> >> > regions have different discontiguous hardcoded addresses (L1
> >> > instruction in this case starts at 0xffa00000 while L2 starts at
> >> > 0xfeb00000).
> >> >
> >> > the current kallsyms is written to search for the special stext/etext
> >> > symbols only which means the resulting kallsyms output knows nothing
> >> > of the Blackfin symbols living in these on-chip regions.  we've
> >> > written two patches to fix this: the first one is straight forward and
> >> > simply copies & pastes the existing hardcoded regions.  the second
> >> > creates an array of text regions which makes it much easier to extend
> >> > in the future for other people (and can be squashed into the first
> >> > one).
> >> >
> >> > doesnt matter to me which method is picked :)
> >>
> >> I added both as I liked the generalization.
> >> I had to rearrange the "Signed-off-by" in the first patch
> >> as this patch came in vai you and not Robin.
> >
> > I think Mike pulled this from some work I did awhile ago, (and sent to you)
> > that obviously never got added (since I didn't send it in the proper patch
> > format).
> >
> > http://lkml.indiana.edu/hypermail/linux/kernel/0607.1/0558.html
> 
> yeah, the first patch was by Robin ... the "From:" line in the patch
> should have shown that (and git-am would have respected) ...

So does the patch.
What I had to change was that the Signed-off-by: lines indicated
that this patch came in like this:

Robin -> Mike -> Bryan Wu -> Sam
So I rearranged the signed-off-by: lines so it indicated
the following order:

Robin -> Bryan Wu -> Mike -> Sam


I trust that Bryan really did add his sob, and it
was only a mistake that Mike added his sob before
that of Bryans.

	Sam
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