lkml.org 
[lkml]   [2007]   [Nov]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: does /proc/sys/kernel/modprobe actually do anything?
On Thu, 29 Nov 2007, Kay Sievers wrote:

> On Nov 29, 2007 1:58 PM, Robert P. J. Day <rpjday@crashcourse.ca> wrote:
> > On Thu, 29 Nov 2007, Alexey Dobriyan wrote:
> >
> > > On 11/29/07, Robert P. J. Day <rpjday@crashcourse.ca> wrote:
> > > > echo '#! /bin/sh' > /tmp/modprobe
> > > > echo 'echo "$@" >> /tmp/modprobe.log' >> /tmp/modprobe
> > > > echo 'exec /sbin/modprobe "$@"' >> /tmp/modprobe
> > > > chmod a+x /tmp/modprobe
> > > > echo /tmp/modprobe > /proc/sys/kernel/modprobe
> > > >
> > > > i've tried that and i don't see that it does anything whatsoever. i
> > > > ran modprobe under "strace" and it doesn't appear to make any effort
> > > > to check /proc/sys/kernel/modprobe.
> > >
> > > Kernel, not modprobe, checks /proc/sys/kernel/modprobe .
> >
> > actually, ignore that earlier query of mine, i've found the relevant
> > code under kernel/ in sysctl.c and sysctl_check.c and kmod.c. but
> > it's still not clear why what is described in
> > Documentation/debugging-modules.txt (and shown above) doesn't work, so
> > i'm still open to suggestions. thanks.
>
> Kernel code can request a module to be loaded by calling
> request_module(). The /proc/sys/kernel/modprobe value is the path to
> the binary which the kernel executes when this function is called.
> It is used by some modules, or if you open an existing device node
> which has no actual driver loaded.
>
> Most modules are loaded by device id's (modalias) of a device. The
> module is loaded by pure userspace tools and not by the kernel and
> therefore /proc/sys/kernel/modprobe is not involved at all in most
> module loading.
>
> The text in Documentation/debugging-modules.txt is purely about
> kernel module loading requests, and not helpful for the common
> module loading case.

i'd eventually come to a conclusion sort of like that. so that
suggests that what's in Documentation/debugging-modules.txt should
really be updated to reflect that; otherwise, other folks might trip
across it like i did and wonder why it's just not working for them.

rday

========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

http://crashcourse.ca
========================================================================
-
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/

\
 
 \ /
  Last update: 2007-11-29 18:23    [W:0.039 / U:0.804 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site