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. +ifndef CONFIG_64BIT +cflags-y += -mfast-indirect-calls +endif # Currently we save and restore fpregs on all kernel entry/interruption paths. # If that gets optimized, we might need to disable the use of fpregs in the
