linux-kernel - Re: [PATCH] serial: change remove NR

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Date:	Thu, 31 Jul 2008 20:20:35 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Dhaval Giani" <dhaval@...ux.vnet.ibm.com>,
	"Mike Travis" <travis@....com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: change remove NR_IRQS in 8250.c

On Thu, Jul 31, 2008 at 4:50 AM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:
>> replace
>>       [PATCH] serial: change irq_lists to use dyn_array
>> use small array with index to handle irq locking for serial port
>> hope 32 slot is enough
>
> Could you size this array by NR_UARTS (our worst case usage)

how about crazy user set that too big?

> and place irq_no in struct irq_info?
should be ok
>
> Also you want to hold irq_info->lock when you set or clear irq_no.
> Just to be on the safe side.  I expect we can avoid clearing the irq_no
> in the irq_lists and prevent a few more races from being a possibility.

will try

YH
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