linux-kernel - RE: [PATCH v2] net: bluetooth: hci_sock: Use 'const void *' instead of 'void *' for 2nd parameter of hci_test

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Date:	Wed, 4 Feb 2015 11:59:39 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Chen Gang S' <gang.chen@...rus.com.cn>,
	"marcel@...tmann.org" <marcel@...tmann.org>,
	"gustavo@...ovan.org" <gustavo@...ovan.org>,
	"johan.hedberg@...il.com" <johan.hedberg@...il.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	"linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2] net: bluetooth: hci_sock: Use 'const void *' instead
 of 'void *' for 2nd parameter of hci_test_bit()

From: Chen Gang S
> -static inline int hci_test_bit(int nr, void *addr)
> +static inline int hci_test_bit(int nr, const void *addr)
>  {
>  	return *((__u32 *) addr + (nr >> 5)) & ((__u32) 1 << (nr & 31));
>  }

Is there a 'standard' function lurking that will do the above.
On x86 the cpus 'bit test' instruction will handle bit numbers
greater than the word size - so it can be a single instruction.

	David