Re: SCSI RAM driver ported to 3.3 kernel for file system and I/O testing

[chetan loke <loke.chetan@xxxxxxxxx>]

On Wed, May 16, 2012 at 3:35 PM, Matthew Wilcox <willy@xxxxxxxxxxxxxxx> wrote:
> On Wed, May 16, 2012 at 03:31:55PM -0400, chetan loke wrote:
>> > +               if (list_empty(&ram_device->commands))
>> > +                       wake_up_process(ram_device->thread);
>>
>> Didn't look in detail but if the queue is empty then why would you
>> want to wake up the kthread? What if you just wake_up after
>> list_add_tail below?
>
> If the list is non-empty, then the kthread has already been woken up
> and doesn't need to be woken again.

Sorry, not able to follow. wait_even_interruptible will put kthread to
sleep. So how will it be already awake?
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