Add BPI-R2 4.19 support

root/target/linux/mediatek/patches-4.19/0074-add-compiler-gcc8.h.patch

@@ -0,0 +1,78 @@
+From f290d46885f04adeed948a332ff333e258fb6868 Mon Sep 17 00:00:00 2001
+From: Frank Wunderlich <frank-w@public-files.de>
+Date: Wed, 20 Mar 2019 17:29:14 +0100
+Subject: [PATCH 74/77] add compiler-gcc8.h
+
+---
+ include/linux/compiler-gcc8.h | 59 +++++++++++++++++++++++++++++++++++
+ 1 file changed, 59 insertions(+)
+ create mode 100644 include/linux/compiler-gcc8.h
+
+diff --git a/include/linux/compiler-gcc8.h b/include/linux/compiler-gcc8.h
+new file mode 100644
+index 000000000000..eecd5e1fd781
+--- /dev/null
++++ b/include/linux/compiler-gcc8.h
+@@ -0,0 +1,59 @@
++#ifndef __LINUX_COMPILER_H
++#error "Please don't include <linux/compiler-gcc8.h> directly, include <linux/compiler.h> instead."
++#endif
++
++#define __used				__attribute__((__used__))
++#define __must_check			__attribute__((warn_unused_result))
++#define __compiler_offsetof(a, b)	__builtin_offsetof(a, b)
++
++/* Mark functions as cold. gcc will assume any path leading to a call
++   to them will be unlikely.  This means a lot of manual unlikely()s
++   are unnecessary now for any paths leading to the usual suspects
++   like BUG(), printk(), panic() etc. [but let's keep them for now for
++   older compilers]
++
++   gcc also has a __attribute__((__hot__)) to move hot functions into
++   a special section, but I don't see any sense in this right now in
++   the kernel context */
++#define __cold			__attribute__((__cold__))
++
++#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
++
++#ifndef __CHECKER__
++# define __compiletime_warning(message) __attribute__((warning(message)))
++# define __compiletime_error(message) __attribute__((error(message)))
++#endif /* __CHECKER__ */
++
++/*
++ * Mark a position in code as unreachable.  This can be used to
++ * suppress control flow warnings after asm blocks that transfer
++ * control elsewhere.
++ */
++#define unreachable() __builtin_unreachable()
++
++/* Mark a function definition as prohibited from being cloned. */
++#define __noclone	__attribute__((__noclone__))
++
++/*
++ * Tell the optimizer that something else uses this function or variable.
++ */
++#define __visible __attribute__((externally_visible))
++
++/*
++ * GCC 'asm goto' miscompiles certain code sequences:
++ *
++ *   http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670
++ *
++ * Work it around via a compiler barrier quirk suggested by Jakub Jelinek.
++ *
++ * (asm goto is automatically volatile - the naming reflects this.)
++ */
++#define asm_volatile_goto(x...)	do { asm goto(x); asm (""); } while (0)
++
++#ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP
++#define __HAVE_BUILTIN_BSWAP32__
++#define __HAVE_BUILTIN_BSWAP64__
++#define __HAVE_BUILTIN_BSWAP16__
++#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */
++
++#define KASAN_ABI_VERSION 6
+-- 
+2.19.1
+