Re: [dpdk-dev] [dpdk-stable] [PATCH] malloc: fix duplicate mem event notification

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 11/29/2018 3:47 PM, Wiles, Keith wrote:
> 
> 
>> On Nov 29, 2018, at 9:36 AM, Burakov, Anatoly <anatoly.burakov@intel.com> wrote:
>>
>> On 29-Nov-18 2:54 PM, Wiles, Keith wrote:
>>>> On Nov 29, 2018, at 8:21 AM, Anatoly Burakov <anatoly.burakov@intel.com> wrote:
>>>>
>>>> We already trigger a mem event notification inside the walk function,
>>>> no need to do it twice.
>>>>
>>>> Fixes: f32c7c9de961 ("malloc: enable event callbacks for external memory")
>>>> Cc: stable@dpdk.org
>>>>
>>>> Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
>>>> ---
>>>> lib/librte_eal/common/rte_malloc.c | 4 ----
>>>> 1 file changed, 4 deletions(-)
>>>>
>>>> diff --git a/lib/librte_eal/common/rte_malloc.c b/lib/librte_eal/common/rte_malloc.c
>>>> index 0da5ad5e8..750a83c2c 100644
>>>> --- a/lib/librte_eal/common/rte_malloc.c
>>>> +++ b/lib/librte_eal/common/rte_malloc.c
>>>> @@ -518,10 +518,6 @@ sync_memory(const char *heap_name, void *va_addr, size_t len, bool attach)
>>>> 		rte_errno = -wa.result;
>>>> 		ret = -1;
>>>> 	} else {
>>>> -		/* notify all subscribers that a new memory area was added */
>>>> -		if (attach)
>>>> -			eal_memalloc_mem_event_notify(RTE_MEM_EVENT_ALLOC,
>>>> -					va_addr, len);
>>>> 		ret = 0;
>>>> 	}
>>> This change leaves
>>> 	else {
>>> 		ret = 0;
>>> 	}
>>> Needs to be:
>>> 	else
>>> 		ret = 0;
>>
>> Checkpatch disagrees :P Brackets are needed everywhere if at least one of the branches is a multiline branch. No brackets needed only if all branches are one-line branches.
>>
>> As a side note, I would also argue that we shouldn't leave bracket-less if statements altogether, because it makes for extra effort whenever a single-line statement inevitably becomes a multiline one (e.g. could be as simple as putting in a debug printf - i now have to add brackets everywhere...). But that's a topic for another day :)
> 
> Well it seems to be a very questionable formatting to leave the else with brackets in a single line style IMO.
> 
> Also look at section 1.6.2 in DPDK coding style as it states something different.
> 
> 	* Closing and opening braces go on the same line as the else keyword.
> 	* Braces that are not necessary should be left out.
> 
> 	if (test)
> 		stmt;
> 	else if (bar) {        
> 		stmt;
> 		stmt;
> 	} else
> 		stmt;
> 
> Note the last else here. Looking at this code it appears check patch is wrong here compared to the DPDK coding style.

Yes we diverge a little there, Linux prefers if a leg of the branch has braces
other legs should have it, we left out braces whenever we can.