0d7ebbbc6e
__used is defined to be __attribute__((unused)) for all pre-3.3 gcc compilers to suppress warnings for unused functions because perhaps they are referenced only in inline assembly. It is defined to be __attribute__((used)) for gcc 3.3 and later so that the code is still emitted for such functions. __maybe_unused is defined to be __attribute__((unused)) for both function and variable use if it could possibly be unreferenced due to the evaluation of preprocessor macros. Function prototypes shall be marked with __maybe_unused if the actual definition of the function is dependant on preprocessor macros. No update to compiler-intel.h is necessary because ICC supports both __attribute__((used)) and __attribute__((unused)) as specified by the gcc manual. __attribute_used__ is deprecated and will be removed once all current code is converted to using __used. Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Adrian Bunk <bunk@stusta.de> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
25 lines
674 B
C
25 lines
674 B
C
/* Never include this file directly. Include <linux/compiler.h> instead. */
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/* These definitions are for GCC v3.x. */
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#include <linux/compiler-gcc.h>
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#if __GNUC_MINOR__ >= 3
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# define __used __attribute__((__used__))
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# define __attribute_used__ __used /* deprecated */
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#else
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# define __used __attribute__((__unused__))
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# define __attribute_used__ __used /* deprecated */
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#endif
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#if __GNUC_MINOR__ >= 4
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#define __must_check __attribute__((warn_unused_result))
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#endif
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/*
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* A trick to suppress uninitialized variable warning without generating any
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* code
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*/
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#define uninitialized_var(x) x = x
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#define __always_inline inline __attribute__((always_inline))
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