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Message-ID: <4C9B39DC.8050409@kernel.org>
Date: Thu, 23 Sep 2010 13:28:28 +0200
From: Tejun Heo <tj@...nel.org>
To: Jiri Kosina <jkosina@...e.cz>
CC: Namhyung Kim <namhyung@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ida: document IDA_BITMAP_LONGS calculation
On 09/23/2010 01:25 PM, Jiri Kosina wrote:
> On Fri, 3 Sep 2010, Namhyung Kim wrote:
>
>> IDA_BITMAP_LONGS value is calculated take into account struct ida_bitmap
>> not to waste memory space. Comment it.
>>
>> 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.
Thank you.
--
tejun
--
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