lkml.org 
[lkml]   [2000]   [Jan]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Proposal for kernel change


On Sun, 23 Jan 2000, Alan Cox wrote:

> > problem. Normal sys_read() and sys_write() would pass copy_to_user() /
> > copy_from_user() here. For sys_readv() and sys_writev() - well,
> > corresponding function that would copy to/from iovector. IIRC we have
> > something like that either in net/core/* or in net/socket.c...
>
> read and write sometimes lock and DMA from user pages in new driver toys
> using Stephen's rawio and kiovec stuff. You would need to be careful how
> you arranged it to avoid shooting yourself in the foot on future optimisations

Ouch... And what happens if we do write() _not_ from user page? I can't
think of a place that would write to character device from kernel space,
but...


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:56    [W:0.055 / U:0.348 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site