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From: Mark Pearson <devnull.port@googlemail.com>
To: Karol Kozimor <sziwan@hell.org.pl>
Cc: Julia Lawall <julia@diku.dk>,
	corentincj@iksaif.net, sziwan@users.sourceforge.net,
	acpi4asus-user@lists.sourceforge.net,
	linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: Re: [PATCH 2/9] drivers/acpi/asus_acpi.c: Correct use of ! and &
Date: Wed, 27 Feb 2008 19:29:15 +0100	[thread overview]
Message-ID: <47C5ABFB.3050607@googlemail.com> (raw)
In-Reply-To: <7C626792-02A6-4BE6-B5F2-D75899F3990C@hell.org.pl>

Karol Kozimor wrote:
> On 26-02-2008, at 21:42, Julia Lawall wrote:
>>      if (invert)        /* invert target value */
>> -        led_out = !led_out & 0x1;
>> +        led_out = !(led_out & 0x1);
>>
>>      if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
>>          printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n",
> 
> 
> IIRC we're just supposed to flip the last bit here, so the original code
> is correct.
> Best regards,
> 

Seems an odd way of doing:

	led_out ^= 0x01;

It this due to some optimisation?

Cheers, Mark.

  parent reply	other threads:[~2008-02-27 18:29 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-26 20:42 Julia Lawall
2008-02-27 17:03 ` Karol Kozimor
2008-02-27 17:41   ` Julia Lawall
2008-02-27 18:29   ` Mark Pearson [this message]
2008-02-29  5:55     ` Andrew Morton
2008-02-29  6:10       ` Matthew Wilcox
2008-02-29  6:14         ` Matthew Wilcox
2008-02-29  6:19         ` Andrew Morton
2008-02-29 11:01       ` Julia Lawall
2008-02-29 11:08         ` Andrew Morton
2008-02-29 18:06       ` Mark Pearson
2008-02-29 21:33         ` Andrew Morton

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