kernel: add support for gcc 5

backport compiler-gcc5.h header from kernel upstream.

Change-Id: I89b5e1e3b2f72e5a8eb84d2062a6957744dfe049
Signed-off-by: Yannick Gicquel <yannick.gicquel@iot.bzh>

4 files changed, 198 insertions, 1 deletions

diff --git a/meta-rcar-gen2/recipes-kernel/linux-libc-headers/linux-libc-headers/0001-kernel-add-support-for-gcc-5.patch b/meta-rcar-gen2/recipes-kernel/linux-libc-headers/linux-libc-headers/0001-kernel-add-support-for-gcc-5.patch
new file mode 100644
index 0000000..3289c64
--- /dev/null
+++ b/meta-rcar-gen2/recipes-kernel/linux-libc-headers/linux-libc-headers/0001-kernel-add-support-for-gcc-5.patch
@@ -0,0 +1,97 @@
+From 1a1cd1ce2ec9de673626fdedfeaccb56f36d4f71 Mon Sep 17 00:00:00 2001
+From: Sasha Levin <sasha.levin@oracle.com>
+Date: Mon, 13 Oct 2014 15:51:05 -0700
+Subject: [PATCH] kernel: add support for gcc 5
+
+We're missing include/linux/compiler-gcc5.h which is required now
+because gcc branched off to v5 in trunk.
+
+Just copy the relevant bits out of include/linux/compiler-gcc4.h,
+no new code is added as of now.
+
+This fixes a build error when using gcc 5.
+
+Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
+Cc: <stable@vger.kernel.org>
+Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
+Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
+---
+ include/linux/compiler-gcc5.h | 66 +++++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 66 insertions(+)
+ create mode 100644 include/linux/compiler-gcc5.h
+
+diff --git a/include/linux/compiler-gcc5.h b/include/linux/compiler-gcc5.h
+new file mode 100644
+index 0000000..cdd1cc2
+--- /dev/null
++++ b/include/linux/compiler-gcc5.h
+@@ -0,0 +1,66 @@
++#ifndef __LINUX_COMPILER_H
++#error "Please don't include <linux/compiler-gcc5.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]
++
++   Early snapshots of gcc 4.3 don't support this and we can't detect this
++   in the preprocessor, but we can live with this because they're unreleased.
++   Maketime probing would be overkill here.
++
++   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.
++ *
++ * Early snapshots of gcc 4.5 don't support this and we can't detect
++ * this in the preprocessor, but we can live with this because they're
++ * unreleased.  Really, we need to have autoconf for the kernel.
++ */
++#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.
++ * Fixed in GCC 4.8.2 and later versions.
++ *
++ * (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 */
+-- 
+1.9.1
+
diff --git a/meta-rcar-gen2/recipes-kernel/linux-libc-headers/linux-libc-headers_3.10.bb b/meta-rcar-gen2/recipes-kernel/linux-libc-headers/linux-libc-headers_3.10.bb
index 69a9396..f4de23e 100644
--- a/meta-rcar-gen2/recipes-kernel/linux-libc-headers/linux-libc-headers_3.10.bb
+++ b/meta-rcar-gen2/recipes-kernel/linux-libc-headers/linux-libc-headers_3.10.bb
@@ -9,5 +9,7 @@ FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
 RENESAS_BACKPORTS_URL="git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas-backport.git"
 SRCREV = "b8ca8c397343f4233f9f68fc3a5bf8e1c9b88251"
 SRC_URI = "${RENESAS_BACKPORTS_URL};protocol=git;branch=bsp/v3.10.31-ltsi/rcar-gen2-1.9.2 \
-          file://scripts-Makefile.headersinst-install-headers-from-sc.patch"
+          file://scripts-Makefile.headersinst-install-headers-from-sc.patch \
+          file://0001-kernel-add-support-for-gcc-5.patch \
+"
 S = "${WORKDIR}/git"
diff --git a/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0001-kernel-add-support-for-gcc-5.patch b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0001-kernel-add-support-for-gcc-5.patch
new file mode 100644
index 0000000..3289c64
--- /dev/null
+++ b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas/0001-kernel-add-support-for-gcc-5.patch
@@ -0,0 +1,97 @@
+From 1a1cd1ce2ec9de673626fdedfeaccb56f36d4f71 Mon Sep 17 00:00:00 2001
+From: Sasha Levin <sasha.levin@oracle.com>
+Date: Mon, 13 Oct 2014 15:51:05 -0700
+Subject: [PATCH] kernel: add support for gcc 5
+
+We're missing include/linux/compiler-gcc5.h which is required now
+because gcc branched off to v5 in trunk.
+
+Just copy the relevant bits out of include/linux/compiler-gcc4.h,
+no new code is added as of now.
+
+This fixes a build error when using gcc 5.
+
+Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
+Cc: <stable@vger.kernel.org>
+Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
+Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
+---
+ include/linux/compiler-gcc5.h | 66 +++++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 66 insertions(+)
+ create mode 100644 include/linux/compiler-gcc5.h
+
+diff --git a/include/linux/compiler-gcc5.h b/include/linux/compiler-gcc5.h
+new file mode 100644
+index 0000000..cdd1cc2
+--- /dev/null
++++ b/include/linux/compiler-gcc5.h
+@@ -0,0 +1,66 @@
++#ifndef __LINUX_COMPILER_H
++#error "Please don't include <linux/compiler-gcc5.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]
++
++   Early snapshots of gcc 4.3 don't support this and we can't detect this
++   in the preprocessor, but we can live with this because they're unreleased.
++   Maketime probing would be overkill here.
++
++   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.
++ *
++ * Early snapshots of gcc 4.5 don't support this and we can't detect
++ * this in the preprocessor, but we can live with this because they're
++ * unreleased.  Really, we need to have autoconf for the kernel.
++ */
++#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.
++ * Fixed in GCC 4.8.2 and later versions.
++ *
++ * (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 */
+-- 
+1.9.1
+
diff --git a/meta-rcar-gen2/recipes-kernel/linux/linux-renesas_3.10.bb b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas_3.10.bb
index 6971adc..3ab1ea2 100644
--- a/meta-rcar-gen2/recipes-kernel/linux/linux-renesas_3.10.bb
+++ b/meta-rcar-gen2/recipes-kernel/linux/linux-renesas_3.10.bb
@@ -12,6 +12,7 @@ PV_append = "+git${SRCREV}"
 RENESAS_BACKPORTS_URL="git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas-backport.git"
 SRCREV = "b8ca8c397343f4233f9f68fc3a5bf8e1c9b88251"
 SRC_URI = "${RENESAS_BACKPORTS_URL};protocol=git;branch=bsp/v3.10.31-ltsi/rcar-gen2-1.9.2 \
+	file://0001-kernel-add-support-for-gcc-5.patch \
 	file://0001-arm-lager-Add-vmalloc-384M-to-bootargs-of-DTS.patch \
 	file://0001-arm-koelsch-Add-vmalloc-384M-to-bootargs-of-DTS.patch \
 	file://0001-arm-alt-Add-vmalloc-384M-to-bootargs-of-DTS.patch \