Re: [PATCH stable 4.9] powerpc/lib: fix book3s/32 boot failure due to code patching

[Christophe Leroy]

Le 15/05/2019 Ã 15:08, Greg KH a ÃcritÂ:
> On Wed, May 15, 2019 at 02:35:36PM +0200, Christophe Leroy wrote:
> > Le 15/05/2019 Ã 10:29, Greg KH a ÃcritÂ:
> > > On Wed, May 15, 2019 at 06:40:47AM +0000, Christophe Leroy wrote:
> > > > [Backport of upstream commit b45ba4a51cde29b2939365ef0c07ad34c8321789]
> > > >
> > > > On powerpc32, patch_instruction() is called by apply_feature_fixups()
> > > > which is called from early_init()
> > > >
> > > > There is the following note in front of early_init():
> > > >    * Note that the kernel may be running at an address which is different
> > > >    * from the address that it was linked at, so we must use RELOC/PTRRELOC
> > > >    * to access static data (including strings).  -- paulus
> > > >
> > > > Therefore init_mem_is_free must be accessed with PTRRELOC()
> > > >
> > > > Fixes: 1c38a84d4586 ("powerpc: Avoid code patching freed init sections")
> > > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=203597
> > > > Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxx>
> > > >
> > > > ---
> > > > Can't apply the upstream commit as such due to several other unrelated stuff
> > > > like for instance STRICT_KERNEL_RWX which are missing.
> > > > So instead, using same approach as for commit 252eb55816a6f69ef9464cad303cdb3326cdc61d
> > >
> > > Now queued up, thanks.
> >
> > Should go to 4.4 as well since the commit it fixes is now queued for 4.4
> > ([PATCH 4.4 056/266] powerpc: Avoid code patching freed init sections)
>
> Ok, can someone send me a backport that actually applies there?

Done

Christophe