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4Front, On Mon, 29 May 2006, 4Front Technologies wrote: > > How about external modules that have a kernel dependant part and kernel > independant part?. Kernel independant part could live in a separate tree and > has its own makefiles. > > But regparm requires that ALL parts linked into the module need to have > regparm defined. So it's another headache to write makefiles for the kernel > independant part to figure out if the distro support regparm or not. They way I approached it was to get CFLAGS for compiling both the kernel dependent part and kernel independent part. The interface exported from the kernel dependent part to the indepdent part have the regparms attribute explicity pinned on exported symbols (e.g. on supporting architectures either to __attribute__((__regparm__(3))) or __attribute__((__regparm(0)))). LiS uses regparm(0) for binary compatible (kernel independent) STREAMS modules for historical reasons. Linux Fast-STREAMS uses regparm(3). Taking a similar approach, make all your kernel dependent part exported function (and function pointer) symbols "fastcall" and then forget about the compiler flag. If you access regular kernel symbols, you, of course, do not have this choice. It would have been nice if the kernel would set the regparms on all exported symbols, but external modules was really just an afterthought. The autoconf approach that I take does not use kbuild, primarily because of the inherent separation between kernel depedent part and independent part for STREAMS (STREAMS subsystem is kernel dependent, STREAMS modules attempt to be somewhat kernel independent and use an SVR4.2 ABI). The autoconf/automake makefiles handle the building of both. And, of course, they nicely handle building all the othter GNU/Linux things like user space programs built on the same definitions, manual pages, etc. --brian - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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