drivers/md/md.c calls csum_partial(). IF CONFIG_NET=n and BLK_DEV_MD=y, if arch/*/lib/Makefile puts csum-partial.o or checksum.o into lib-y, the function is present. (Of course, if the function is placed in obj-y, there is no problem.) If CONFIG_NET=n and BLK_DEV_MD=n, if arch/*/lib/Makefile puts csum-partial.o or checksum.o into lib-y, the function is removed from the kernel image due to having no built-in callers. Build a kernel with CONFIG_NET-n and CONFIG_BLK_DEV_MD=m. Unless csum_partial() is built and kept by some arch Makefile, the result is: ERROR: "csum_partial" [drivers/md/md-mod.ko] undefined! make[1]: *** [__modpost] Error 1 make: *** [modules] Error 2 Any suggested solutions? Recorded for posterity here: http://bugzilla.kernel.org/show_bug.cgi?id=8242 --- ~Randy *** Remember to use Documentation/SubmitChecklist when testing your code *** - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html