Greetings! I would like to know as to: 1. How the CRC is computed for an exported symbol in the Linux kernel, and 2. Given a kernel .c file, how can I obtain the CRC checksums for a symbol. For linux-3.0.2 (example), I compiled with CONFIG_MODVERSIONS=y, and running make built vmlinux, and generated the Module.symvers file. I believe genksyms is used to generate the CRC information. I had referred the "Kernel Symbols and CONFIG_MODVERSIONS" documentation [1] written by Mark McLoughlin. I tried the following in the top-level kernel sources: $ gcc -E -D__GENKSYMS__ -DCONFIG_MODVERSIONS -DEXPORT_SYMTAB crypto/api.c -I/tmp/linux-3.0.2/include -I/tmp/linux-3.0.2/arch/x86/include | ./scripts/genksyms/genksyms and I get the following error output: === Output === /tmp/linux-3.0.2/include/linux/jiffies.h:43:42: error: division by zero in #if In file included from /tmp/linux-3.0.2/include/linux/tracepoint.h:19:0, from /tmp/linux-3.0.2/include/linux/module.h:18, from crypto/api.c:22: /tmp/linux-3.0.2/include/linux/rcupdate.h:160:2: error: #error "Unknown RCU implementation specified to kernel configuration" In file included from /tmp/linux-3.0.2/include/linux/module.h:21:0, from crypto/api.c:22: /tmp/linux-3.0.2/arch/x86/include/asm/module.h:59:2: error: #error unknown processor family === End === The documentation for genksyms is old, and now there is no -k option? Appreciate any inputs in this regard, Thanks! SK [1] Kernel Symbols and CONFIG_MODVERSIONS. http://www.skynet.ie/~mark/pub/symbols.txt -- Shakthi Kannan http://www.shakthimaan.com