defined(LINUX_VERSION_CODE) 是什么函数？

yelvtaohua

#if ! defined(LINUX_VERSION_CODE)
#include <linux/version.h>
#endif

这个defined()是什么函数？

rickxbx

Post by yelvtaohua
#if ! defined(LINUX_VERSION_CODE)
#include <linux/version.h>
#endif

这个defined()是什么函数？

http://lists.arm.linux.org.uk/pi ... -August/004772.html

1.     181 Note that kernel versions 2.0.x (and earlier) mistakenly called the
   
2.     182 ioremap() function "vremap()".  ioremap() is the proper name, but I
   
3.     183 didn't think straight when I wrote it originally.  People who have to
   
4.     184 support both can do something like:
   
5.     185
   
6.     186     /* support old naming silliness */
   
7.     187     #if LINUX_VERSION_CODE < 0x020100
   
8.     188     #define ioremap vremap
   
9.     189     #define iounmap vfree
   
10.     190     #endif
    
11.     191
    
12.     192 at the top of their source files, and then they can use the right names
    
13.     193 even on 2.0.x systems.
    

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