Re: [PATCH] tty_ioctl: locking for tty_wait_until_sent

[Andi Kleen]

On Mon, Mar 10, 2008 at 10:06:43PM +0000, Alan Cox wrote:
> On 10 Mar 2008 23:12:51 +0100
> Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:
> 
> > Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> writes:
> > 
> > > This function still depends on the big kernel lock in some cases. Push
> > > locking into the function ready for removal of the BKL from ioctl call
> > > paths.
> > 
> > Didn't you forget the .ioctl -> .unlocked_ioctl change?
> 
> We are not yet ready to unlock the device ioctl paths for tty. We still

Traditionally the usual is to first convert .ioctl to .unlocked_ioctl
and just slap lock_kernel around the whole ioctl handler and then 
later move it down step by step.

I didn't read the code completely but I assume tty_ioctl would be that
handler. I guess i was wrong?

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