Bug#762390: Patch for hppa arch
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
Reply to: