* Re: [PATCH 2/2] compiler/gcc6: add support for GCC 6
2015-04-14 9:25 ` [PATCH 2/2] compiler/gcc6: add support for GCC 6 Martin Liška
@ 2015-04-15 9:29 ` Martin Liška
0 siblings, 0 replies; 2+ messages in thread
From: Martin Liška @ 2015-04-15 9:29 UTC (permalink / raw)
To: linux-sparse; +Cc: sparse
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On 04/14/2015 11:25 AM, Martin Liška wrote:
> Because GCC trunk version has switched to GCC 6.x, new header file
> is needed.
>
> Signed-off-by: Martin Liska <mliska@suse.cz>
> ---
> include/linux/compiler-gcc6.h | 55 +++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 55 insertions(+)
> create mode 100644 include/linux/compiler-gcc6.h
>
> diff --git a/include/linux/compiler-gcc6.h b/include/linux/compiler-gcc6.h
> new file mode 100644
> index 0000000..208767a
> --- /dev/null
> +++ b/include/linux/compiler-gcc6.h
> @@ -0,0 +1,55 @@
> +#ifndef __LINUX_COMPILER_H
> +#error "Please don't include <linux/compiler-gcc6.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))
> +
> +/*
> + * 'asm goto' miscompilation is fixed in GCC 5.x version:
> + *
> + * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670
> + */
> +#define asm_volatile_goto(x...) do { asm goto(x); } 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 4
Hello.
v2 of the patch where I made a copy of compiler-gcc6.h from compiler-gcc5.h.
Thanks,
Martin
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From 2163ba712ed9e2305d8f3fad704b201d70edd3d8 Mon Sep 17 00:00:00 2001
From: mliska <mliska@suse.cz>
Date: Wed, 15 Apr 2015 10:56:43 +0200
Subject: [PATCH 2/2] compiler/gcc6: add support for GCC 6
Because GCC trunk version has switched to GCC 6.x, new header file is needed.
Signed-off-by: Martin Liska <mliska@suse.cz>
---
include/linux/compiler-gcc6.h | 59 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 59 insertions(+)
create mode 100644 include/linux/compiler-gcc6.h
diff --git a/include/linux/compiler-gcc6.h b/include/linux/compiler-gcc6.h
new file mode 100644
index 0000000..ba064fa
--- /dev/null
+++ b/include/linux/compiler-gcc6.h
@@ -0,0 +1,59 @@
+#ifndef __LINUX_COMPILER_H
+#error "Please don't include <linux/compiler-gcc6.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 4
--
2.1.4
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