-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 9 Jun 2003 13:52:39 -0000 "Biswaranjan " <biswaranjan_p@rediffmail.com> wrote: >Hi, > >i'm trying to write a device driver for a particular device. i need >to manipulate the buffer provided to the kernel during write() >directly from the kernel without using copy_from_user() due to >efficiency reasons.. If you are searching for efficiency maybe the best thing you can do is to call access_ok() on the user space buffer just the first time you use it and then use __copy_form_user() which is faster than copy_from_user() since it doesn't perform this kind of test. This is surely the best you can do AFAIK. Regards. - -- Angelo Dell'Aera 'buffer' Antifork Research, Inc. http://buffer.antifork.org PGP information in e-mail header -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.2 (GNU/Linux) iD8DBQE+5RmXpONIzxnBXKIRAlrsAKDDM5Ye8q3A7ndOBDkyv4EQlBb+kgCbB33Z XesmqvZ0PeuaxWEyz+buetk= =RPWU -----END PGP SIGNATURE----- -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
