linux-kernel - Re: [PATCH 0/10] use safer test on the result of find_first_zero

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Message-ID: <CAMuHMdXPBQTYA0c=1hkC7943-_J59TVSFaEKsfY1F2ogV=Ld+A@mail.gmail.com>
Date:	Wed, 4 Jun 2014 12:55:29 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Julia Lawall <julia.lawall@...6.fr>
Cc:	David Laight <David.Laight@...lab.com>,
	linux-rdma <linux-rdma@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
	Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ath10k@...ts.infradead.org" <ath10k@...ts.infradead.org>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	driverdevel <devel@...verdev.osuosl.org>,
	"iss_storagedev@...com" <iss_storagedev@...com>,
	scsi <linux-scsi@...r.kernel.org>,
	linux-s390 <linux-s390@...r.kernel.org>,
	"adi-buildroot-devel@...ts.sourceforge.net" 
	<adi-buildroot-devel@...ts.sourceforge.net>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 0/10] use safer test on the result of find_first_zero_bit

Hi Julia,

On Wed, Jun 4, 2014 at 11:52 AM, Julia Lawall <julia.lawall@...6.fr> wrote:
>> Maybe the documented return code should be changed to allow for the
>> existing behaviour.
>
> Sorry, I'm not sure to understand what you suggest here.

include/asm-generic/bitops/find.h:

| /**
|  * find_first_zero_bit - find the first cleared bit in a memory region
|  * @addr: The address to start the search at
|  * @size: The maximum number of bits to search
|  *
|  * Returns the bit number of the first cleared bit.
|  * If no bits are zero, returns @size.

"If no bits are zero, returns @size or a number larger than @size."

|  */
| extern unsigned long find_first_zero_bit(const unsigned long *addr,
|                                          unsigned long size);

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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