linux-kernel - Re: deprecate and convert some sleep

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Date:	Tue, 1 Aug 2006 13:20:28 -0500
From:	"Nish Aravamudan" <nish.aravamudan@...il.com>
To:	"Dave Jones" <davej@...hat.com>, arjan@...radead.org,
	"Linux Kernel" <linux-kernel@...r.kernel.org>,
	"Andrew Morton" <akpm@...l.org>
Subject: Re: deprecate and convert some sleep_on variants.

On 8/1/06, Dave Jones <davej@...hat.com> wrote:
> We've been carrying this for a dogs age in Fedora. It'd be good to get
> this in -mm, so that it stands some chance of getting upstreamed at some point.
>
> Signed-off-by: Arjan van de Ven <arjan@...radead.org>
> Signed-off-by: Dave Jones <davej@...hat.com>
>
> diff -urNp --exclude-from=/home/davej/.exclude linux-1060/drivers/block/DAC960.c linux-1070/drivers/block/DAC960.c
> --- linux-1060/drivers/block/DAC960.c
> +++ linux-1070/drivers/block/DAC960.c
> @@ -6132,6 +6132,9 @@ static boolean DAC960_V2_ExecuteUserComm
>    unsigned long flags;
>    unsigned char Channel, TargetID, LogicalDriveNumber;
>    unsigned short LogicalDeviceNumber;
> +  wait_queue_t __wait;
> +
> +  init_waitqueue_entry(&__wait, current);
>
>    spin_lock_irqsave(&Controller->queue_lock, flags);
>    while ((Command = DAC960_AllocateCommand(Controller)) == NULL)
> @@ -6314,11 +6317,18 @@ static boolean DAC960_V2_ExecuteUserComm
>                                         .SegmentByteCount =
>             CommandMailbox->ControllerInfo.DataTransferSize;
>           DAC960_ExecuteCommand(Command);
> +         add_wait_queue(&Controller->CommandWaitQueue, &__wait);
> +         set_current_state(TASK_UNINTERRUPTIBLE);

Could this use prepare_to_wait()

> +
>           while (Controller->V2.NewControllerInformation->PhysicalScanActive)
>             {
>               DAC960_ExecuteCommand(Command);
> -             sleep_on_timeout(&Controller->CommandWaitQueue, HZ);
> +             schedule_timeout(HZ);
> +             set_current_state(TASK_UNINTERRUPTIBLE);

and schedule_timeout_uninterruptible() (which is redundant for the
first invocation, I suppose)

>             }
> +         current->state = TASK_RUNNING;
> +         remove_wait_queue(&Controller->CommandWaitQueue, &__wait);

and finish_wait()?

Same for ibmtr.c ?

Also, would these changes:

> diff -urNp --exclude-from=/home/davej/.exclude linux-1060/include/linux/wait.h linux-1070/include/linux/wait.h
> --- linux-1060/include/linux/wait.h
> +++ linux-1070/include/linux/wait.h

Be better in a separate patch?

Thanks,
Nish
-
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