linux-kernel - Re: [Bulk] Re: [PATCH 1/2] [PCI] Check that MWI bit really did get set

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Date:	Sun, 15 Oct 2006 17:21:53 -0700
From:	David Brownell <david-b@...bell.net>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Andrew Morton <akpm@...l.org>, Matthew Wilcox <matthew@....cx>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	val_henson@...ux.intel.com, netdev@...r.kernel.org,
	linux-pci@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org,
	gregkh@...e.de
Subject: Re: [Bulk] Re: [PATCH 1/2] [PCI] Check that MWI bit really did get set

> > If the drivers doesn't care and if it makes no difference to performance
> > then just delete the call to pci_set_mwi().
> > 
> > But if MWI _does_ make a difference to performance then we should tell
> > someone that it isn't working rather than silently misbehaving?

To repeat:  it's not "misbehaving" since support for MWI cycles is
completely optional.  It'd be more interesting to get messages in
the cases that it can be enabled, since typically it can't be.


> That sounds like we need a printk inside pci_set_mwi then, rather than
> adding a printk to every single caller.

Maybe wrapped in #ifdef CONFIG_SPAM_MY_KERNEL_LOG_MESSAGES ... :)

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