linux-kernel - Re: [Qestion] Softlockup when send IPI to other CPUs

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Message-ID: <DM6PR18MB246092A6734074485E33B8BDD99B0@DM6PR18MB2460.namprd18.prod.outlook.com>
Date:   Fri, 25 Jan 2019 09:57:02 +0000
From:   Shijith Thotton <sthotton@...vell.com>
To:     Catalin Marinas <catalin.marinas@....com>
CC:     Will Deacon <will.deacon@....com>,
        chenwandun <chenwandun@...wei.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "Wangkefeng (Kevin)" <wangkefeng.wang@...wei.com>,
        "anshuman.khandual@....com" <anshuman.khandual@....com>,
        Ganapatrao Kulkarni <gkulkarni@...vell.com>,
        Jayachandran Chandrasekharan Nair <jnair@...vell.com>
Subject: Re: [Qestion] Softlockup when send IPI to other CPUs

On 01/24/2019 10:07 PM, Catalin Marinas wrote:
> Hi  Shijith,
> 
> On Thu, Jan 24, 2019 at 07:00:42AM +0000, Shijith Thotton wrote:
>> On 01/23/2019 11:45 PM, Catalin Marinas wrote:
>>> diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c
>>> index 30695a868107..5c9073bace83 100644
>>> --- a/arch/arm64/mm/flush.c
>>> +++ b/arch/arm64/mm/flush.c
>>> @@ -33,7 +33,11 @@ void sync_icache_aliases(void *kaddr, unsigned long len)
>>>    		__clean_dcache_area_pou(kaddr, len);
>>>    		__flush_icache_all();
>>>    	} else {
>>> -		flush_icache_range(addr, addr + len);
>>> +		/*
>>> +		 * Don't issue kick_all_cpus_sync() after I-cache invalidation
>>> +		 * for user mappings.
>>> +		 */
>>> +		__flush_icache_range(addr, addr + len);
>>>    	}
>>>    }
>>
>> We also faced similar issue with LTP test migrate_pages03 in past and this patch
>> fixes the issue.
>>
>> http://lists.infradead.org/pipermail/linux-arm-kernel/2019-January/623574.html
> 
> Thanks for confirming. I presume I can add your tested-by.
> 

Sure.

Tested-by: Shijith Thotton <sthotton@...vell.com>

Shijith