2007-10-17 00:26:11 -06:00
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#ifndef __LINUX_COMPILER_H
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#error "Please don't include <linux/compiler-gcc4.h> directly, include <linux/compiler.h> instead."
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#endif
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2005-04-16 16:20:36 -06:00
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2009-01-02 10:29:43 -07:00
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/* GCC 4.1.[01] miscompiles __weak */
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2009-02-25 16:22:19 -07:00
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#ifdef __KERNEL__
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# if __GNUC_MINOR__ == 1 && __GNUC_PATCHLEVEL__ <= 1
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# error Your version of gcc miscompiles the __weak directive
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# endif
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2009-01-02 10:29:43 -07:00
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#endif
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2007-05-09 03:35:27 -06:00
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#define __used __attribute__((__used__))
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2005-04-16 16:20:36 -06:00
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#define __must_check __attribute__((warn_unused_result))
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#define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
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2007-07-21 09:10:00 -06:00
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2009-01-02 10:23:03 -07:00
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#if __GNUC_MINOR__ >= 3
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2007-07-21 09:10:00 -06:00
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/* Mark functions as cold. gcc will assume any path leading to a call
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to them will be unlikely. This means a lot of manual unlikely()s
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are unnecessary now for any paths leading to the usual suspects
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like BUG(), printk(), panic() etc. [but let's keep them for now for
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older compilers]
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Early snapshots of gcc 4.3 don't support this and we can't detect this
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in the preprocessor, but we can live with this because they're unreleased.
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Maketime probing would be overkill here.
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gcc also has a __attribute__((__hot__)) to move hot functions into
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a special section, but I don't see any sense in this right now in
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the kernel context */
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#define __cold __attribute__((__cold__))
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2012-01-10 16:07:25 -07:00
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#define __linktime_error(message) __attribute__((__error__(message)))
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2009-12-04 18:44:50 -07:00
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2012-11-21 19:00:25 -07:00
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#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
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2009-12-04 18:44:50 -07:00
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#if __GNUC_MINOR__ >= 5
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/*
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* Mark a position in code as unreachable. This can be used to
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* suppress control flow warnings after asm blocks that transfer
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* control elsewhere.
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*
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* Early snapshots of gcc 4.5 don't support this and we can't detect
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* this in the preprocessor, but we can live with this because they're
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* unreleased. Really, we need to have autoconf for the kernel.
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*/
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#define unreachable() __builtin_unreachable()
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2010-06-29 16:05:25 -06:00
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/* Mark a function definition as prohibited from being cloned. */
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#define __noclone __attribute__((__noclone__))
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2009-12-04 18:44:50 -07:00
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#endif
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2007-07-21 09:10:00 -06:00
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#endif
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2009-09-26 06:33:01 -06:00
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2012-09-17 15:09:15 -06:00
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#if __GNUC_MINOR__ >= 6
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/*
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* Tell the optimizer that something else uses this function or variable.
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*/
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#define __visible __attribute__((externally_visible))
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#endif
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2009-10-09 01:01:39 -06:00
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#if __GNUC_MINOR__ > 0
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2009-09-26 06:33:01 -06:00
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#define __compiletime_object_size(obj) __builtin_object_size(obj, 0)
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2009-10-09 01:01:39 -06:00
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#endif
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2012-09-28 17:20:02 -06:00
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#if __GNUC_MINOR__ >= 3 && !defined(__CHECKER__)
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2009-09-30 05:05:23 -06:00
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#define __compiletime_warning(message) __attribute__((warning(message)))
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2009-10-02 08:50:50 -06:00
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#define __compiletime_error(message) __attribute__((error(message)))
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2009-09-30 05:05:23 -06:00
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#endif
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2012-12-03 09:25:40 -07:00
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#ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP
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#if __GNUC_MINOR__ >= 4
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#define __HAVE_BUILTIN_BSWAP32__
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#define __HAVE_BUILTIN_BSWAP64__
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#endif
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#if __GNUC_MINOR__ >= 8 || (defined(__powerpc__) && __GNUC_MINOR__ >= 6)
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#define __HAVE_BUILTIN_BSWAP16__
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#endif
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#endif
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