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Bug#820567: kexec on mipsel partially broken between ckt20 and ckt25

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On Sun, 2016-04-10 at 14:32 -0700, Elliott Mitchell wrote:
> On Sun, Apr 10, 2016 at 07:47:28PM +0100, Ben Hutchings wrote:
> > 
> > On Sun, 2016-04-10 at 11:09 -0700, Elliott Mitchell wrote:
> > > 
> > > On Sun, Apr 10, 2016 at 10:09:38AM +0100, Ben Hutchings wrote:
> > > > 
> > > > 
> > > > On Sat, 2016-04-09 at 18:31 -0700, Elliott Mitchell wrote:
[...]
> > > > > Doing a double-kexec does work around the issue, but it means I need to
> > > > > hold onto that one magic kernel for the moment...
> > > > > 
> > > > > In other news, it appears sometime between 3.3 and 3.10 there started
> > > > > being a requirement for GCC 4.8 on mipsel.
> > > > Packages in jessie must be buildable using compiler versions in jessie.
> > > > That means either gcc-4.8 or gcc-4.9.
> > > linux-source-3.16 is available as a backport to wheezy, which does not
> > > feature gcc-4.8.
> > That in no way contradicts what I said. :-) ??When I backport the linux
> > source package from jessie to wheezy I change it to use gcc-4.6.
> > 
> > But the linux-source-X.Y packages (which are a different thing to the
> > linux source package!) don't specify any particular compiler version.
> > You can choose that with the CC variable; otherwise the default
> > compiler (specified by the gcc package) will be used.
> For this particular mipsel device I was unable to kexec the kernel unless
> it was built with GCC-4.8.

I see.

> If the kernel was built with GCC-4.7 or
> earlier, I got symptoms identical to the above, messages from the old
> kernel on the console serial port that it was going away and kexec'd
> kernel never output any messages.  I could believe this is a funky
> compiler issue.

Could it be the kernel image is close to a critical size limit?  The
kernel typically gets slightly larger with each stable update.  Does
gcc 4.8 generate a smaller or larger kernel image than older versions?

Ben.

-- 
Ben Hutchings
Humans are not rational beings; they are rationalising beings.

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Bug#820567: kexec on mipsel partially broken between ckt20 and ckt25 Elliott Mitchell <ehem+debian@m5p.com> - 2016-04-10 03:40 +0200
  Bug#820567: kexec on mipsel partially broken between ckt20 and ckt25 Ben Hutchings <ben@decadent.org.uk> - 2016-04-10 11:20 +0200
    Bug#820567: kexec on mipsel partially broken between ckt20 and ckt25 Elliott Mitchell <ehem+debian@m5p.com> - 2016-04-10 20:20 +0200
      Bug#820567: kexec on mipsel partially broken between ckt20 and ckt25 Ben Hutchings <ben@decadent.org.uk> - 2016-04-10 21:00 +0200
        Bug#820567: kexec on mipsel partially broken between ckt20 and ckt25 Elliott Mitchell <ehem+debian@m5p.com> - 2016-04-10 23:40 +0200
          Bug#820567: kexec on mipsel partially broken between ckt20 and ckt25 Ben Hutchings <ben@decadent.org.uk> - 2016-04-11 02:40 +0200
            Bug#820567: kexec on mipsel partially broken between ckt20 and ckt25 Elliott Mitchell <ehem+debian@m5p.com> - 2016-04-11 08:00 +0200

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