linux-kernel - Re: [PATCH] ida: document IDA_BITMAP

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Message-ID: <alpine.LNX.2.00.1009231352410.26813@pobox.suse.cz>
Date:	Thu, 23 Sep 2010 13:52:59 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	Namhyung Kim <namhyung@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ida: document IDA_BITMAP_LONGS calculation

On Thu, 23 Sep 2010, Tejun Heo wrote:

> >> Signed-off-by: Namhyung Kim <namhyung@...il.com>
> >> Acked-by: Tejun Heo <tj@...nel.org>
> >> ---
> >>  include/linux/idr.h |    5 ++++-
> >>  1 files changed, 4 insertions(+), 1 deletions(-)
> >>
> >> diff --git a/include/linux/idr.h b/include/linux/idr.h
> >> index e968db7..3f4b718 100644
> >> --- a/include/linux/idr.h
> >> +++ b/include/linux/idr.h
> >> @@ -117,10 +117,13 @@ void idr_init(struct idr *idp);
> >>  /*
> >>   * IDA - IDR based id allocator, use when translation from id to
> >>   * pointer isn't necessary.
> >> + *
> >> + * IDA_BITMAP_LONGS is calculated to be one less to accommodate
> >> + * ida_bitmap->nr_busy so that the whole struct fits in 128 bytes.
> >>   */
> >>  #define IDA_CHUNK_SIZE		128	/* 128 bytes per chunk */
> >>  #define IDA_BITMAP_LONGS	(128 / sizeof(long) - 1)
> >> -#define IDA_BITMAP_BITS		(IDA_BITMAP_LONGS * sizeof(long) * 8)
> >> +#define IDA_BITMAP_BITS 	(IDA_BITMAP_LONGS * sizeof(long) * 8)
> >>  
> >>  struct ida_bitmap {
> >>  	long			nr_busy;
> > 
> > Tejun, any word on this patch? Doesn't seem to be present in linux-next.
> 
> Ooh, I was hoping this one could go through the trivial tree.  It
> would be great if you can pick up the patch.

Bah, I missed your Acked-by, sorry for the noise. Applied now, thanks.

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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