On Sun, 2014-01-12 at 01:02 +0530, Monam Agarwal wrote:
> This introduces fls in lustre/ldlm/ldlm_extent.c
> to find the last set bit.
[]
> Signed-off-by: Monam Agarwal <monamagarwal123@xxxxxxxxx>
> ---
> Changes since v1:
> *Incorrect commit message
> *Use of fls function
[]
> diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_extent.c b/drivers/staging/lustre/lustre/ldlm/ldlm_extent.c
[]
> @@ -150,10 +150,12 @@ struct ldlm_interval *ldlm_interval_detach(struct ldlm_lock *l)
> static inline int lock_mode_to_index(ldlm_mode_t mode)
> {
> int index;
> + int len;
>
> LASSERT(mode != 0);
> LASSERT(IS_PO2(mode));
> - for (index = -1; mode; index++, mode >>= 1) ;
> + len = fls(mode);
> + index = len-1;
There's no need for len at all.
index = fls(mode) - 1;
would be fine.
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