linux-kernel - Re: [PATCH] 8250: option 'force

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Message-ID: <20160728160145.GB27400@thunk.org>
Date:	Thu, 28 Jul 2016 12:01:45 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Max Staudt <mstaudt@...e.de>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] 8250: option 'force_polling' for buggy IRQs

On Thu, Jul 28, 2016 at 07:47:04AM -0700, Greg KH wrote:
> > I agree, and I thought about it, but since this is meant for a very limited
> > audience, I think a catch-all is the easiest solution - both in terms of
> > implementation as well as ease of use.
> > 
> > It's not meant for general consumption anyway.
> 
> Then I really don't want to have to maintain and support such a kernel
> option for 20+ years, just because of one broken system out there like
> this.  There are workarounds for this, as you have seen, including
> booting with a "real" userspace, so I don't want to take this patch.

One way to make this a bit more general purpose would be too add a way
to configure ttyS0 completely --- e.g., being able to specify the
port, irq, uart type, flags, etc.  It still wouldn't be needed except
for very rarely (since either serial ports use self-configuring buses
--- e.g., USB, PCI, etc.) or they use the legacy x86 ports.

So perhaps Greg might be more willing to take that kind of change, but
even then, it could be argued that the maintaining such a kernel
option for just a few non-standard or broken systems is still not
worth it, but it would at least be somewhat more general purpose.

						- Ted