linux-kernel - Re: Support for TI FlashMedia (pci id 104c:8033, 104c:803b) flash card readers

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Message-Id: <200607281604.k6SG4xV3021888@harpo.it.uu.se>
Date:	Fri, 28 Jul 2006 18:04:59 +0200 (MEST)
From:	Mikael Pettersson <mikpe@...uu.se>
To:	oakad@...oo.com, pazke@...pac.ru
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Support for TI FlashMedia (pci id 104c:8033, 104c:803b) flash card readers

On Fri, 28 Jul 2006 06:02:11 -0700 (PDT), Alex Dubov wrote:
>The exact condition is (irq_status!=0 &&
>irq_status!=0xffffffff). I think it is not any better
>that what I have.
>
>--- Andrey Panin <pazke@...pac.ru> wrote:
>
>> On 208, 07 27, 2006 at 08:34:06PM -0700, Alex Dubov
>> wrote:
>> 
>> What this strange line (in tifm_7xx1_isr function)
>> is supposed to do:
>> 
>>         if(irq_status && (~irq_status))

If you're chasing micro-optimisations, you could write

    /* if irq_status is not 0 or ~0, do <blah> */
    if (((unsigned)irq_status + 1) >= 2)

which should reduce the number of conditional branches
to a single one. (And drop the cast if irq_status is
declared as unsigned.)

But for long-term maintenance just spelling out the exact
condition (irq_status != 0 && irq_status != ~0) is preferable.
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