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tty->device switched to dev_t
There are very few uses of tty->device left by now; most of
them actually want dev_t (process accounting, proc/<pid>/stat, several
ioctls, slip.c logics, etc.) and the rest will go away shortly.
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sanitized driver->driver_name initialization and use
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tty->tty_index added; we initialize it with minor(tty->device) -
tty->driver->minor_start. Majority of remaining tty->device uses had
that form and are switched to use of tty->index.
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new field - tty->tty_name;
initialized to <driver->name><tty index+driver->base_name>
when we allocate tty_struct. Drivers code switched to use of that
beast (in debugging printks, mostly). Large, but trivial.
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Instead of copying tty_driver into tty_struct we put a reference
in there. tty->driver turned into a pointer, users updated. Large, but
trivial
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Many places use inappropriate types for comparing jiffies,
int for example. Fix those places up.
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Also got rid of the unused flag paramater.
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Currently, uart_get_divisor() and uart_get_baud_rate() take a tty
structure. We really want them to take a termios structure so we
can avoid passing a tty structure all the way down to the low level
drivers.
In order to do this, we need to be able to convert a termios
structure to a numeric baud rate - we provide tty_termios_baud_rate() in
tty_io.c for this purpose. It performs a subset of the
tty_get_baud_rate() functionality, but without any "alt_speed"
kludge.
We finally export uart_get_baud_rate() and uart_get_divisor() to for
low level drivers to use. We now have all the functions in place
to support ports which want to have access to the real baud rate
rather than a divisor value.
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This is the next iteration of the workqueue abstraction.
The framework includes:
- per-CPU queueing support.
on SMP there is a per-CPU worker thread (bound to its CPU) and per-CPU
work queues - this feature is completely transparent to workqueue-users.
keventd automatically uses this feature. XFS can now update to work-queues
and have the same per-CPU performance as it had with its per-CPU worker
threads.
- delayed work submission
there's a new queue_delayed_work(wq, work, delay) function and a new
schedule_delayed_work(work, delay) function. The later one is used to
correctly fix former tq_timer users. I've reverted those changes in 2.5.40
that changed tq_timer uses to schedule_work() - eg. in the case of
random.c or the tty flip queue it was definitely the wrong thing to do.
delayed work means a timer embedded in struct work_struct. I considered
using split struct work_struct and delayed_work_struct types, but lots
of code actively uses task-queues in both delayed and non-delayed mode,
so i went for the more generic approach that allows both methods of work
submission. Delayed timers do not cause any other overhead in the
normal submission path otherwise.
- multithreaded run_workqueue() implementation
the run_workqueue() function can now be called from multiple contexts, and
a worker thread will only use up a single entryy - this property is used
by the flushing code, and can potentially be used in the future to extend
the number of per-CPU worker threads.
- more reliable flushing
there's now a 'pending work' counter, which is used to accurately detect
when the last work-function has finished execution. It's also used to
correctly flush against timed requests. I'm not convinced whether the old
keventd implementation got this detail right.
- i switched the arguments of the queueing function(s) per Jeff's
suggestion, it's more straightforward this way.
Driver fixes:
i have converted almost every affected driver to the new framework. This
cleaned up tons of code. I also fixed a number of drivers that were still
using BHs (these drivers did not compile in 2.5.40).
while this means lots of changes, it might ease the QA decision whether to
put this patch into 2.5.
The pach converts roughly 80% of all tqueue-using code to workqueues - and
all the places that are not converted to workqueues yet are places that do
not compile in vanilla 2.5.40 anyway, due to unrelated changes. I've
converted a fair number of drivers that do not compile in 2.5.40, and i
think i've managed to convert every driver that compiles under 2.5.40.
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- merge with Alan (USB, zoran, sony motion-eye, rio, dmi-scan)
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- more bugs found by the automatic stanford checker, yay!
- Andrew Morton: fix SAK locking bugs by moving it into a process context
- Johannes Erdfelt: USB updates
- Jeff Garzik: merge Hermes driver by David Gibson
- Jens Axboe: cdrom merges, ll_rw_blk proper accounting
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