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

[Wiles, Keith]

> On Nov 29, 2018, at 9:36 AM, Burakov, Anatoly <anatoly.burakov at 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 at 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 at dpdk.org
>>> 
>>> Signed-off-by: Anatoly Burakov <anatoly.burakov at 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.

> 
>>> unlock:
>>> -- 
>>> 2.17.1
>> Regards,
>> Keith
> 
> 
> -- 
> Thanks,
> Anatoly

Regards,
Keith