Re: PATCH: Export console functions for use by Software Suspend nice display

From: Nigel Cunningham (ncunningham_at_users.sourceforge.net)
Date: 01/23/04

  • Next message: Nigel Cunningham: "Re: PATCH: Export console functions for use by Software Suspend nice display" 
    Date:	Fri, 23 Jan 2004 16:18:07 +1300
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>

    Sorry to reply to myself.

    I don't think I worded that last message right... I didn't mean that
    locking isn't an issue at all, just that we don't have to worry about
    another process writing to the console while we are.

    Nigel

    On Sat, 2004-01-24 at 05:07, Nigel Cunningham wrote:
    > Hi.
    >
    > On Fri, 2004-01-23 at 15:49, Benjamin Herrenschmidt wrote:
    > > Also, by using write instead of blasting the low level code,
    > > you will not have to worry about locking issues. (The way
    > > you tap the low level stuff should require at least the console
    > > semaphore held, write to /dev/console don't)
    > >
    > > Ben
    >
    > Locking is not an issue. This is suspend-to-disk. Everything else is
    > stopped while we're working.
    >
    > By the way, am I understanding the suggestion correctly? Do you
    > (collective) mean getting a fd for /dev/console from within kernel code
    > and using that? I've been looking at the way printk works and wondering
    > if con->write is equivalent (once I find the right console to write to)?
    >
    > Regards,
    >
    > Nigel 

    -- 
My work on Software Suspend is graciously brought to you by
LinuxFund.org.

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