The patch titled
Subject: kernel: add support for gcc 5
has been added to the -mm tree. Its filename is
kernel-add-support-for-gcc-5.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kernel-add-support-for-gcc-5.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kernel-add-support-for-gcc-5.patch
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------------------------------------------------------
From: Sasha Levin <sasha.levin@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/compiler-gcc5.h | 66 ++++++++++++++++++++++++++++++++
1 file changed, 66 insertions(+)
diff -puN /dev/null include/linux/compiler-gcc5.h
--- /dev/null
+++ a/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 */
_
Patches currently in -mm which might be from sasha.levin@xxxxxxxxxx are
mm-mmap-use-pr_emerg-when-printing-bug-related-information.patch
kernel-add-support-for-gcc-5.patch
mm-balloon_compaction-ignore-anonymous-pages.patch
introduce-dump_vma.patch
introduce-dump_vma-fix.patch
introduce-dump_vma-fix-2.patch
introduce-vm_bug_on_vma.patch
convert-a-few-vm_bug_on-callers-to-vm_bug_on_vma.patch
convert-a-few-vm_bug_on-callers-to-vm_bug_on_vma-checkpatch-fixes.patch
mm-mmapc-clean-up-config_debug_vm_rb-checks.patch
vmstat-on-demand-vmstat-workers-v8-fix-2.patch
mm-introduce-do_shared_fault-and-drop-do_fault-fix-fix.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
mm-replace-remap_file_pages-syscall-with-emulation.patch
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