Re: [PATCH v2] net: bluetooth: hci_sock: Use 'const void *' instead of 'void *' for 2nd parameter of hci_test_bit()

Sergei Shtylyov
2015-02-04T20:13:37Z

Hello.

On 02/04/2015 02:59 PM, David Laight wrote:

>> -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.

Of course, there's test_bit().

> David

WBR, Sergei