patches: Add a patch for ppc64

Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>

Author: nathanchance

patches/llvm-all/linux/ppc64/0001-powerpc-vdso32-Drop-mabi-elfv1-for-32-bit-objects.patch

@@ -0,0 +1,46 @@
+From 959a7892b40ce6553827343b1d25a0aad507b467 Mon Sep 17 00:00:00 2001
+From: Daniel Axtens <dja@axtens.net>
+Date: Thu, 10 Jan 2019 12:42:58 +1100
+Subject: [PATCH] powerpc/vdso32: Drop -mabi=elfv1 for 32 bit objects
+
+All 64-bit objects need to specify the flag to be compiled correctly, we
+just don't need it for 32-bit objects. GCC just ignored it, but clang
+doesn't.
+
+Link: https://github.com/ClangBuiltLinux/linux/issues/240
+Signed-off-by: Daniel Axtens <dja@axtens.net>
+Signed-off-by: Joel Stanley <joel@jms.id.au>
+(am from https://lore.kernel.org/linuxppc-dev/20190110014258.20963-1-joel@jms.id.au/)
+Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
+---
+ arch/powerpc/kernel/vdso32/Makefile | 14 ++++++++++++++
+ 1 file changed, 14 insertions(+)
+
+diff --git a/arch/powerpc/kernel/vdso32/Makefile b/arch/powerpc/kernel/vdso32/Makefile
+index 06f54d947057..d50978ec2ee5 100644
+--- a/arch/powerpc/kernel/vdso32/Makefile
++++ b/arch/powerpc/kernel/vdso32/Makefile
+@@ -34,6 +34,20 @@ obj-y += vdso32_wrapper.o
+ extra-y += vdso32.lds
+ CPPFLAGS_vdso32.lds += -P -C -Upowerpc
+ 
++# clang refuses to accept -mabi=elfv1 for when using the
++# 64-bit target in 32-bit mode
++ifdef CONFIG_CC_IS_CLANG
++ifdef CONFIG_PPC64
++AFLAGS_REMOVE_getcpu.o += -mabi=elfv1
++endif
++AFLAGS_REMOVE_sigtramp.o += -mabi=elfv1
++AFLAGS_REMOVE_gettimeofday.o += -mabi=elfv1
++AFLAGS_REMOVE_datapage.o += -mabi=elfv1
++AFLAGS_REMOVE_cacheflush.o += -mabi=elfv1
++AFLAGS_REMOVE_note.o += -mabi=elfv1
++endif
++
++
+ # Force dependency (incbin is bad)
+ $(obj)/vdso32_wrapper.o : $(obj)/vdso32.so
+ 
+-- 
+2.22.0
+