linux-kernel - Re: [PATCH 2/9] drivers/acpi/asus

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Date:	Thu, 28 Feb 2008 22:19:48 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Mark Pearson <devnull.port@...glemail.com>,
	Karol Kozimor <sziwan@...l.org.pl>,
	Julia Lawall <julia@...u.dk>, corentincj@...aif.net,
	sziwan@...rs.sourceforge.net, acpi4asus-user@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Len Brown <lenb@...nel.org>
Subject: Re: [PATCH 2/9] drivers/acpi/asus_acpi.c: Correct use of ! and &

On Thu, 28 Feb 2008 23:10:23 -0700 Matthew Wilcox <matthew@....cx> wrote:

> On Thu, Feb 28, 2008 at 09:55:03PM -0800, Andrew Morton wrote:
> >  	if (invert)		/* invert target value */
> > -		led_out = !led_out & 0x1;
> > +		led_out = !led_out;
> >  
> >  	if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
> 
> But now you're writing 0xffffffff instead of 1.  I think the suggestion
> of led_out ^= 1 was the correct one.
> 

!0 is 1, not 0xffffffff.

IOW, ! != ~ ;)


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