## ia64/linux-2.6.18-xen.hg

### view lib/int_sqrt.c @ 871:9cbcc9008446

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xen/x86: don't initialize cpu_data[]'s apicid field on generic code

Afaict, this is not only redundant with the intialization done in

drivers/xen/core/smpboot.c, but actually results - at least for

secondary CPUs - in the Xen-specific value written to be later

overwritten with whatever the generic code determines (with no

guarantee that the two values are identical).

Signed-off-by: Jan Beulich <jbeulich@novell.com>

Afaict, this is not only redundant with the intialization done in

drivers/xen/core/smpboot.c, but actually results - at least for

secondary CPUs - in the Xen-specific value written to be later

overwritten with whatever the generic code determines (with no

guarantee that the two values are identical).

Signed-off-by: Jan Beulich <jbeulich@novell.com>

author | Keir Fraser <keir.fraser@citrix.com> |
---|---|

date | Thu May 14 10:09:15 2009 +0100 (2009-05-14) |

parents | 831230e53067 |

children |

line source

2 #include <linux/kernel.h>

3 #include <linux/module.h>

5 /**

6 * int_sqrt - rough approximation to sqrt

7 * @x: integer of which to calculate the sqrt

8 *

9 * A very rough approximation to the sqrt() function.

10 */

11 unsigned long int_sqrt(unsigned long x)

12 {

13 unsigned long op, res, one;

15 op = x;

16 res = 0;

18 one = 1UL << (BITS_PER_LONG - 2);

19 while (one > op)

20 one >>= 2;

22 while (one != 0) {

23 if (op >= res + one) {

24 op = op - (res + one);

25 res = res + 2 * one;

26 }

27 res /= 2;

28 one /= 4;

29 }

30 return res;

31 }

32 EXPORT_SYMBOL(int_sqrt);