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    <p>At the risk of looking like a reputation whore, let me summarize the answers I've acquired so far.</p> <hr> <h2>Kernel 3.7+</h2> <p>A generic implementation was <a href="http://lwn.net/Articles/510202/" rel="nofollow noreferrer">introduced</a> by Sasha Levin in 2012 and <a href="http://lxr.free-electrons.com/source/include/linux/hashtable.h?v=3.7" rel="nofollow noreferrer">merged</a> for the 3.7 kernel.</p> <hr> <h2>Older Kernels</h2> <p>The kernel (as of 2.6.38) does not include a generic hash table implementation, but does include some pieces:</p> <ul> <li><code>hlist_*/HLIST_*</code> in <a href="http://lxr.linux.no/#linux+v2.6.38/include/linux/list.h#L564" rel="nofollow noreferrer" title="list.h">list.h</a> are single-pointer-head doubly-linked list structs and macros useful for hash buckets. (<a href="https://stackoverflow.com/questions/5489025/hash-table-in-linux-kernel/5503509#5503509">answer below</a> from <a href="https://stackoverflow.com/users/363662/adobriyan">adobriyan</a>)</li> <li><a href="http://lxr.linux.no/#linux+v2.6.38/include/linux/hash.h" rel="nofollow noreferrer">hash.h</a> includes hashing routines for ints, longs, and pointers. <a href="http://www.citi.umich.edu/techreports/reports/citi-tr-00-1.pdf" rel="nofollow noreferrer">This article</a> by Chuck Lever studies the performance of these routines.</li> <li>See <code>pid_hash</code> in <a href="http://lxr.linux.no/#linux+v2.6.38/kernel/pid.c" rel="nofollow noreferrer">pid.c</a> for an example constructed from these primitives.</li> </ul> <p><a href="http://uthash.sourceforge.net/" rel="nofollow noreferrer">uthash</a> is a generic hash table for C implemented as macros defined in a single header file. This solution may be appropriate for many third-party kernel modules (e.g., device drivers). However, reliance on <code>uthash</code> might impede mainlining of a module.</p>
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