linux-kernel - Re: [RFC] hlist: drop the node parameter from iterators

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Date:	Fri, 02 Nov 2012 16:33:09 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	paulmck@...ux.vnet.ibm.com, dipankar@...ibm.com, mingo@...nel.org,
	hpa@...or.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, peter.senna@...il.com
Subject: Re: [RFC] hlist: drop the node parameter from iterators

On 11/02/2012 04:16 PM, Linus Torvalds wrote:
> On Thu, Nov 1, 2012 at 7:26 PM, Sasha Levin <sasha.levin@...cle.com> wrote:
>>
>> Here are some stats:
>>
>>  - Applying the patch from -next on top of your current git head
>> results in 3 conflicts.
>>
>>  - Applying the patch from your current git head on top of v3.6 results
>> in 18 conflicts.
>>
>>  - Applying the patch from 3.6 on top of 3.5 results in 25 conflicts.
> 
> Ok, that sounds slightly painful, but not unmanageable.
> 
> Can you send me the actual patch, and I'll mull on this a bit more? I
> could run the coccinelle script myself, but I assume (maybe
> incorrectly?) that there are manual fixes to clean some stuff up
> afterwared..

You're right about that. There are 2 things which needs to be done after
running the script:

 - Coccinelle doesn't handle cases where there are multiple variables in
the declaration. That means that things like:

	struct hlist_node *node, *tmp;

Have to be fixed manually.

That's common when hlist_for_each_entry_safe() is used afterwards.

 - Some places actually use node for their needs, while coccinelle can
automatically fix that to use '(ptr)->member', I'd rather go through those
places manually and make sure we're doing the right thing.


Do you want the patch on top of your git head, or on top of -next?


Thanks,
Sasha

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