This is a note to let you know that I've just added the patch titled
parisc: Only use -mfast-indirect-calls option for 32-bit kernel builds
to the 3.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
parisc-only-use-mfast-indirect-calls-option-for-32-bit-kernel-builds.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d26a7730b5874a5fa6779c62f4ad7c5065a94723 Mon Sep 17 00:00:00 2001
From: John David Anglin <dave.anglin@xxxxxxxx>
Date: Mon, 22 Sep 2014 20:54:50 -0400
Subject: parisc: Only use -mfast-indirect-calls option for 32-bit kernel builds
From: John David Anglin <dave.anglin@xxxxxxxx>
commit d26a7730b5874a5fa6779c62f4ad7c5065a94723 upstream.
In spite of what the GCC manual says, the -mfast-indirect-calls has
never been supported in the 64-bit parisc compiler. Indirect calls have
always been done using function descriptors irrespective of the
-mfast-indirect-calls option.
Recently, it was noticed that a function descriptor was always requested
when the -mfast-indirect-calls option was specified. This caused
problems when the option was used in application code and doesn't make
any sense because the whole point of the option is to avoid using a
function descriptor for indirect calls.
Fixing this broke 64-bit kernel builds.
I will fix GCC but for now we need the attached change. This results in
the same kernel code as before.
Signed-off-by: John David Anglin <dave.anglin@xxxxxxxx>
Signed-off-by: Helge Deller <deller@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/parisc/Makefile | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- 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
Patches currently in stable-queue which might be from dave.anglin@xxxxxxxx are
queue-3.16/parisc-only-use-mfast-indirect-calls-option-for-32-bit-kernel-builds.patch
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