linux-kernel - Re: [PATCH] mm/page_isolation: fix tracepoint to mirror check function behavior

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Date:	Thu, 24 Mar 2016 16:52:18 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Lucas Stach <l.stach@...gutronix.de>,
	Joonsoo Kim <js1304@...il.com>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, kernel@...gutronix.de,
	patchwork-lst@...gutronix.de
Subject: Re: [PATCH] mm/page_isolation: fix tracepoint to mirror check
 function behavior

On 03/24/2016 04:51 PM, Vlastimil Babka wrote:
> On 03/17/2016 06:40 PM, Lucas Stach wrote:
>> Page isolation has not failed if the fin pfn extends beyond the end pfn
>> and test_pages_isolated checks this correctly. Fix the tracepoint to
>> report the same result as the actual check function.
>
> Right.
>
>> Signed-off-by: Lucas Stach <l.stach@...gutronix.de>
>
> Acked-by: Vlastimil Babka <vbabka@...e.cz>

Note you didn't have Andrew in To/Cc.

>> ---
>>    include/trace/events/page_isolation.h | 2 +-
>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/include/trace/events/page_isolation.h b/include/trace/events/page_isolation.h
>> index 6fb644029c80..8738a78e6bf4 100644
>> --- a/include/trace/events/page_isolation.h
>> +++ b/include/trace/events/page_isolation.h
>> @@ -29,7 +29,7 @@ TRACE_EVENT(test_pages_isolated,
>>
>>    	TP_printk("start_pfn=0x%lx end_pfn=0x%lx fin_pfn=0x%lx ret=%s",
>>    		__entry->start_pfn, __entry->end_pfn, __entry->fin_pfn,
>> -		__entry->end_pfn == __entry->fin_pfn ? "success" : "fail")
>> +		__entry->end_pfn <= __entry->fin_pfn ? "success" : "fail")
>>    );
>>
>>    #endif /* _TRACE_PAGE_ISOLATION_H */
>>
>
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