Hi
I really don't know where to report this issue,
it's about scatter-gather, which usually be used in network,
so I forward the mail from mentor's mail list to here.
I am sorry if I send to the wrong mail list, and I am very
appreciate if someone can tell me where to report it.
Best regards,
Michael Wang
-------- Original Message --------
Subject: Re: May be a bug in scatterlist.c
Date: Mon, 07 Nov 2011 14:45:45 +0800
From: Michael Wang <wang...@linux.vnet.ibm.com>
To: kernel-ment...@selenic.com
On 11/07/2011 12:01 PM, Michael Wang wrote:
Hi, Experts
I found there are may be a bug in
file: lib/scatterlist.c
func: __sg_alloc_table
line: 248
left -= sg_size;
if the max_ents is 1 and nents is 3 and sg chain enabled,
the sg_size will be 0, and it will always while because the
left will not go less.
Well, looks like the max_ents is 4096/24 = 170, far more than
1, but still, I am confused about this function.
For example, if I want to alloc 340 entries, this function looks
will set the table finally like below:
table chained by 3 scatterlist block,
1
nents = 169,
orig_nents = 169,
real size = 170 * scatterlist size
2
nents = 169,
orig_nents = 169,
real size = 170 * scatterlist size
3
nents = 2,
orig_nents = 2,
real size = 2 * scatterlist size
Still looks strange, the block3 looks like a waste of memory,
I think I really need some expert's help to understand it.
Thanks,
Michael Wang
I think here should use
left -= alloc_size;
I will be very happy if anyone can help me to see whether
this is really a bug, and tell me where should I report it,
and I will be very glad to provide a patch if it is a bug.
Best regards,
Michael Wang
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