patches: llvm-8: arm: Add -z common-page-size patch

Unfortunately, this is probably not going to get picked up any time soon
and our CI has been red for a month now because of it. Let's fix that.

I verified this resolves the issue locally.

[skip ci]

Link: ClangBuiltLinux/linux#451
Signed-off-by: Nathan Chancellor <[email protected]>

Author: nathanchance

patches/llvm-8/linux/arm/0001-ARM-VDSO-Drop-implicit-common-page-size-linker-flag.patch

@@ -0,0 +1,37 @@
+From 7a48e7c758761495f446ddd8eea8bc30208e69e9 Mon Sep 17 00:00:00 2001
+From: Nick Desaulniers <[email protected]>
+Date: Mon, 10 Dec 2018 14:31:32 -0800
+Subject: [PATCH] ARM: VDSO: Drop implicit common-page-size linker flag
+
+GNU linker's -z common-page-size's default value is based on the target
+architecture. arch/arm/vdso/Makefile sets it to the architecture
+default, which is implicit and redundant. Drop it.
+
+Link: https://lkml.kernel.org/r/[email protected]
+Acked-by: Arnd Bergmann <[email protected]>
+Acked-by: Nathan Lynch <[email protected]>
+Suggested-by: Nathan Chancellor <[email protected]>
+Signed-off-by: Nick Desaulniers <[email protected]>
+(am from https://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=8860/1)
+Signed-off-by: Nathan Chancellor <[email protected]>
+---
+ arch/arm/vdso/Makefile | 3 +--
+ 1 file changed, 1 insertion(+), 2 deletions(-)
+
+diff --git a/arch/arm/vdso/Makefile b/arch/arm/vdso/Makefile
+index fadf554d9391..db1754438267 100644
+--- a/arch/arm/vdso/Makefile
++++ b/arch/arm/vdso/Makefile
+@@ -11,8 +11,7 @@ ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector
+ ccflags-y += -DDISABLE_BRANCH_PROFILING
+ 
+ ldflags-y = -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
+-	    -z max-page-size=4096 -z common-page-size=4096 \
+-	    -nostdlib -shared \
++	    -z max-page-size=4096 -nostdlib -shared \
+ 	    $(call ld-option, --hash-style=sysv) \
+ 	    $(call ld-option, --build-id) \
+ 	    -T
+-- 
+2.22.0.rc3
+