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POErrors in Linux Kernel headers
 

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  1. POErrors in Linux Kernel headers
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    <p>I'm trying to compile a library which includes some headers from kernel-devel package. I linked the appropriate headers, but now I get compilation errors in those header files.</p> <pre><code>/usr/include/asm-generic/bitops/fls64.h: In function ‘int fls64(__u64)’: /usr/include/asm-generic/bitops/fls64.h:10: error: ‘fls’ was not declared in this scope /usr/include/asm-generic/bitops/fls64.h:11: error: ‘fls’ was not declared in this scope </code></pre> <p>And, here are the code from asm-generic/bitops/fls64.h</p> <pre><code>#ifndef _ASM_GENERIC_BITOPS_FLS64_H_ #define _ASM_GENERIC_BITOPS_FLS64_H_ #include &lt;asm/types.h&gt; static inline int fls64(__u64 x) { __u32 h = x &gt;&gt; 32; if (h) return fls(h) + 32; return fls(x); } #endif /* _ASM_GENERIC_BITOPS_FLS64_H_ */ </code></pre> <p>As you can notice "return fls(h)", there's no definition of fls(). I can resolve this by including "fls.h", but am I suppose to fix such errors in standard Kernel headers??</p> <p>Any pointers which could explain why is it this way and what can I do to get around such issues?? Btw, the errors I mentioned here are just the tip of the iceberg. There are a lot of such (delcaration missing) errors in multiple such headers.</p> <p>Help would be greatly appreciated. Thanks!</p> <p>rgds/R.</p> <p>PS: some system details:</p> <p>Linux Distribution: CentOS (5.5)</p> <pre><code>[raj@localhost common]$ uname -a Linux localhost.localdomain 2.6.18-238.9.1.el5 #1 SMP Tue Apr 12 18:10:56 EDT 2011 i686 i686 i386 GNU/Linux [raj@localhost common]$ cat /proc/version Linux version 2.6.18-238.9.1.el5 (mockbuild@builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-50)) #1 SMP Tue Apr 12 18:10:56 EDT 2011 </code></pre>
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    1. USRaj
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    1. COPlease post more of the output from the compiler. The real error is probably above the excerpt you quoted.
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      1. USRobin Green
    2. CORobin, I didn't posted more because I think that's irrelevant. My concern is that I think a standard Linux header file fls64.h is using a function for which there is no definition. Is this normal?
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      1. USRaj
    3. COI think it also depends on how to config the kernel. The code is standard but the configuration may have 1000 or more possibilities.
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      1. USJiang
 

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