Date: Mon, 6 Feb 2006 14:41:54 -0500
From: Dave Jones <davej@redhat.com>
To: Yuki Cuss <celtic@sairyx.org>
Cc: David Vrabel <dvrabel@arcom.com>, Russell King <rmk@arm.linux.org.uk>,
       Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: serial: SERIAL_8250_RUNTIME_UARTS must be <= SERIAL_8250_NR_UARTS
Message-ID: <20060206194153.GA30359@redhat.com>
Mail-Followup-To: Dave Jones <davej@redhat.com>,
	Yuki Cuss <celtic@sairyx.org>, David Vrabel <dvrabel@arcom.com>,
	Russell King <rmk@arm.linux.org.uk>,
	Linux Kernel <linux-kernel@vger.kernel.org>
References: <43E72479.4020804@arcom.com> <43E7280B.6060607@sairyx.org>
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On Mon, Feb 06, 2006 at 09:42:19PM +1100, Yuki Cuss wrote:
 > David Vrabel wrote:
 > 
 > >If SERIAL_8250_RUNTIME_UARTS is > SERIAL_8250_NR_UARTS then more serial
 > >ports are registered than we've allocated memory for.  Prevent this by
 > >limiting SERIAL_8250_RUNTIME_UARTS in the serial Kconfig.
 > >
 > >Signed-off-by: David Vrabel <dvrabel@arcom.com>
 > > 
 > >
 > 
 > Is there any real use case for having *less* registered serial ports and 
 > having some spare?

Having the ability to build a kernel image which supports many serial ports,
whilst at the same same time when booted on the common-case systems with
two serial ports, not creating so many /dev/ttyS* nodes or sysfs objects
wasting ram that'll never be used or reclaimed.

		Dave
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