On Sun, Sep 21, 2014 at 08:53:39PM +0200, Helge Deller wrote: > Package: linux > Version: 3.16.3-2 > Severity: bug > Tags: patch > > Dear Debian Kernel maintainers, > > could you please temporarily add this hppa-specific patch to the debian > kernel sources? > > Currently the 64bit hppa kernel gets miscompiled by gcc-4.8 and as such > it will not boot. > > The attached patch fixes one of the problems. Latest changes in gcc-4.8 > made changes to the -mfast-indirect-calls option which now produces wrong code > when compiling for 64bit. The problem is being worked on in upstream gcc-4.8, > and we don't know yet if we will implement -mfast-indirect-calls for 64bit > (which might introduce side-effects) or not. That's the reason why I don't > want > to push attached patch upstream yet. > > The second problem is, that gcc-4.9 (which is used in debian to bootstrap > gcc-4.8) > miscompiles one specific gcc-4.8 source code path and this bug is reported > upstream in > GCC PR: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63302 > We work on that too. > > So, if you could apply the attached patch temporarily for now it would help us > to get further. I will either send the patch upstream or we will fix the > compiler. > The decision is still pending, but I will inform you when this patch can be > removed > from debian kernel sources again (hopefully soon!). > > BTW: If you apply it, there is no need to trigger a new upload specifically > for this bug/hppa... > > Thanks, > Helge
> diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile > index 7187664..5db8882 100644 > --- a/arch/parisc/Makefile > +++ b/arch/parisc/Makefile > @@ -48,7 +48,12 @@ cflags-y := -pipe > > # These flags should be implied by an hppa-linux configuration, but they > # are not in gcc 3.2. > -cflags-y += -mno-space-regs -mfast-indirect-calls > +cflags-y += -mno-space-regs > + > +# -mfast-indirect-calls is only relevant for 32-bit kernels. Would it make sense to point out here that -mfast-indirect-calls is not only unneeded but bad until http://link.to/relevant-discussion is resolved? > +ifndef CONFIG_64BIT > +cflags-y += -mfast-indirect-calls > +endif > Best regards Uwe -- Pengutronix e.K. | Uwe Kleine-König | Industrial Linux Solutions | http://www.pengutronix.de/ | -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/20140922072436.gs3...@pengutronix.de
