doxygen/comedi_2include_2linux_2compiler_8h_source.html

00001 /*
00002  * linux/compiler.h compatibility header
00003  */
00004
00005 #ifndef _COMPAT_COMPILER_H
00006 #define _COMPAT_COMPILER_H
00007
00008 #include <linux/version.h>
00009
00010 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,10)) \
00011         || (LINUX_VERSION_CODE == KERNEL_VERSION(2,4,4))
00012
00013 #include_next <linux/compiler.h>
00014
00015 #else
00016
00017 /* Somewhere in the middle of the GCC 2.96 development cycle, we implemented
00018    a mechanism by which the user can annotate likely branch directions and
00019    expect the blocks to be reordered appropriately.  Define __builtin_expect
00020    to nothing for earlier compilers.  */
00021
00022 #if __GNUC__ == 2 && __GNUC_MINOR__ < 96
00023 #define __builtin_expect(x, expected_value) (x)
00024 #endif
00025 #endif
00026
00027 #ifndef likely
00028 #define likely(x)       __builtin_expect(!!(x),1)
00029 #define unlikely(x)     __builtin_expect(!!(x),0)
00030 #endif
00031
00032 #endif /* _COMPAT_COMPILER_H */