linux-kernel - Re: [PATCHv3 02/13] scripts/gdb: Provide kernel list item generators

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Date:	Tue, 8 Mar 2016 14:55:17 +0700
From:	Kieran Bingham <kieran.bingham@...aro.org>
To:	Jeff Mahoney <jeffm@...e.com>, jan.kiszka@...mens.com,
	linux-kernel@...r.kernel.org
Cc:	lee.jones@...aro.org, peter.griffin@...aro.org,
	maxime.coquelin@...com
Subject: Re: [PATCHv3 02/13] scripts/gdb: Provide kernel list item generators

On 08/03/16 10:47, Jeff Mahoney wrote:
> On 3/3/16 6:40 AM, Kieran Bingham wrote:
>> Facilitate linked-list items by providing a generator to return
>> the dereferenced, and type-cast objects from a kernel linked list
>>
>> CC: Jeff Mahoney <jeffm@...e.com>
>>
>> Signed-off-by: Kieran Bingham <kieran.bingham@...aro.org>
>> ---
>> Changes since v1:
>>  * items function removed, and replaced with Jeff Mahoney's cleaner
>>    implementations of list_for_each, and list_for_each_entry
>> ---
>>  scripts/gdb/linux/lists.py | 20 ++++++++++++++++++++
>>  1 file changed, 20 insertions(+)
>>
>> diff --git a/scripts/gdb/linux/lists.py b/scripts/gdb/linux/lists.py
>> index 3a3775bc162b..9f4503738e26 100644
>> --- a/scripts/gdb/linux/lists.py
>> +++ b/scripts/gdb/linux/lists.py
>> @@ -18,6 +18,26 @@ from linux import utils
>>  list_head = utils.CachedType("struct list_head")
>>  
>>  
>> +def list_for_each(head):
>> +    if head.type == list_head.get_type().pointer():
>> +        head = head.dereference()
>> +    elif head.type != list_head.get_type():
>> +        raise gdb.GdbError("Must be struct list_head not %s" % list_head.type)
> 
> Shouldn't this be % head.type?


Ahh yes, good spot thanks!

> 
>> +
>> +    node = head['next'].dereference()
>> +    while node.address != head.address:
>> +        yield node.address
>> +        node = node['next'].dereference()
>> +
>> +
>> +def list_for_each_entry(head, gdbtype, member):
>> +    for node in list_for_each(head):
>> +        if node.type != list_head.get_type().pointer():
>> +            raise TypeError("Type %s found. "
>> +                            "Expected struct list_head *." % node.type)
> 
> Nit, but FWIW, I've adopted the kernel style of always keeping strings
> on one line so they're easily greppable.

Absolutely! good point. Looks like I was trying to make things fit for
the PEP8 tool. Not sure why I didn't pull just the arg to the next line.

Fixed up locally for the next spin.

Also I think as the rest of the kernel python code is using .format() it
probably makes sense to swap that too to match.

> 
> -Jeff
> 


Thanks for the eyes.

Regards
--
Kieran