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From: "David S. Miller" <davem@redhat.com>
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Date: Tue, 15 May 2001 04:15:11 -0700 (PDT)
To: Andrew Morton <andrewm@uow.edu.au>
Cc: kuznet@ms2.inr.ac.ru, jgarzik@mandrakesoft.com,
        linux-kernel@vger.kernel.org
Subject: Re: NETDEV_CHANGE events when __LINK_STATE_NOCARRIER is modified
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Andrew Morton writes:
 > > Again, BKL has nothing to do with this (and ioctl does not hold it)
 > 
 > asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
 > {       
 >         struct file * filp;
 >         unsigned int flag;
 >         int on, error = -EBADF;
 > 
 >         filp = fget(fd);
 >         if (!filp)
 >                 goto out;
 >         error = 0;
 >         lock_kernel();
 > 
 > The CPU running ifconfig spins here.

Alexey's brain is going through net/socket.c:sock_ioctl() :-)

There we drop the kernel lock...

Later,
David S. Miller
davem@redhat.com