netdev - Re: [patch] isdn: fix a wrapping bug in isdn_ppp

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Date:	Wed, 10 Oct 2012 15:58:38 +0200
From:	Andreas Schwab <schwab@...ux-m68k.org>
To:	Joe Perches <joe@...ches.com>
Cc:	Dan Carpenter <dan.carpenter@...cle.com>,
	Karsten Keil <isdn@...ux-pingi.de>,
	"David S. Miller" <davem@...emloft.net>,
	Masanari Iida <standby24x7@...il.com>, netdev@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch] isdn: fix a wrapping bug in isdn_ppp_ioctl()

Sorry, I was misremembering the history of the bit ops.  There has
historically been issues with varying bit order, but noadays set_bit is
always defined consistently with C shifts.

But another issue, set_bit is an atomic operation which may be
significantly more expensive than the equivalent C operation.  Better
use __set_bit when atomicity is not needed.

Andreas.

-- 
Andreas Schwab, schwab@...ux-m68k.org
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