-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 H. Peter Anvin wrote: > It seems to me that we could accomplish the same thing by passing the > number of parameters in the upper bits of the system call number > register (%eax in the case of x86.)
This isn't really a generic solution. The number of parameters is limited to six. There are syscalls with six parameters already. There are many more with five which could only handle one more parameter. Also, is it really simpler? You'd need to have another table which contains the default number of parameters a system call takes so that you can fill in the default value of zero. This extra memory access has to be performed for every system call. I think it is unlikely that this approach is faster. To the contrary, I'd guess. I don't have much invested into this but it seems the sys_indirect approach is so much simpler. Overhead is only paid if you really need it which is rarely the case. Plus, you might have heard Linus and Zack talk about syslets again. Starting syslets can be done using the same interface, I guess. - -- ➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFHQAez2ijCOnn/RHQRAjoHAJ4/Qq4ygaZ4uq6uCIVNq4hfN1m2pACgpJFi Z/vBsGFpUc/EUz+VW66jEIY= =B19x -----END PGP SIGNATURE----- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
