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From: chenzhou <chenzhou10@huawei.com>
To: Dave Young <dyoung@redhat.com>, <catalin.marinas@arm.com>
Cc: <will@kernel.org>, <james.morse@arm.com>, <tglx@linutronix.de>,
	<mingo@redhat.com>, <bhe@redhat.com>, <corbet@lwn.net>,
	<John.P.donnelly@oracle.com>, <prabhakar.pkin@gmail.com>,
	<bhsharma@redhat.com>, <horms@verge.net.au>, <robh+dt@kernel.org>,
	<arnd@arndb.de>, <nsaenzjulienne@suse.de>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>, <kexec@lists.infradead.org>,
	<linux-doc@vger.kernel.org>, <guohanjun@huawei.com>,
	<xiexiuqi@huawei.com>, <huawei.libin@huawei.com>,
	<wangkefeng.wang@huawei.com>
Subject: Re: [PATCH v11 5/5] kdump: update Documentation about crashkernel
Date: Fri, 28 Aug 2020 09:59:19 +0800
Message-ID: <a2e6def1-f81a-d90d-e0a9-c7bdee6675a9@huawei.com> (raw)
In-Reply-To: <20200819120301.GA13727@dhcp-128-65.nay.redhat.com>

Hi Catalin,


On 2020/8/19 20:03, Dave Young wrote:
> On 08/18/20 at 03:07pm, chenzhou wrote:
>>
>> On 2020/8/10 14:03, Dave Young wrote:
>>> Hi,
>>>
>>>>> Previously I remember we talked about to use similar logic as X86, but I
>>>>> remember you mentioned on some arm64 platform there could be no low
>>>>> memory at all.  Is this not a problem now for the fallback?  Just be
>>>>> curious, thanks for the update, for the common part looks good.
>>>> Hi Dave,
>>>>
>>>> Did you mean this discuss: https://lkml.org/lkml/2019/12/27/122?
>>> I meant about this reply instead :)
>>> https://lkml.org/lkml/2020/1/16/616
>> Hi Dave,
>>
>> Sorry for not repley in time, I was on holiday last week.
> Hi, no problem, thanks for following up.
>
>> The platform James mentioned may exist for which have no devices and need no low memory.
>> For our arm64 server platform, there are some devices and need low memory.
>>
>> I got it. For the platform with no low memory, reserving crashkernel will  always fail.
>> How about like this:
> I think the question should leave to Catalin or James, I have no
> suggestion about this:)
Any suggestions about this?

Thanks,
Chen Zhou
>
>> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
>> index a8e34d97a894..4df18c7ea438 100644
>> --- a/arch/arm64/mm/init.c
>> +++ b/arch/arm64/mm/init.c
>> @@ -147,7 +147,7 @@ static void __init reserve_crashkernel(void)
>>         }
>>         memblock_reserve(crash_base, crash_size);
>>  
>> -       if (crash_base >= CRASH_ADDR_LOW_MAX) {
>> +       if (memstart_addr < CRASH_ADDR_LOW_MAX && crash_base >= CRASH_ADDR_LOW_MAX) {
>>                 const char *rename = "Crash kernel (low)";
>>  
>>                 if (reserve_crashkernel_low()) {
>>
>>
>> Thanks,
>> Chen Zhou
>>
>>> Thanks
>>> Dave
>>>
>>>
>>> .
>>>
>>
>
> .
>



  reply index

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-01 13:08 [PATCH v11 0/5] support reserving crashkernel above 4G on arm64 kdump Chen Zhou
2020-08-01 13:08 ` [PATCH v11 1/5] arm64: kdump: add macro CRASH_ALIGN and CRASH_ADDR_LOW_MAX Chen Zhou
2020-08-01 13:08 ` [PATCH v11 2/5] x86: kdump: move reserve_crashkernel_low() into crash_core.c Chen Zhou
2020-08-06 13:36   ` Ingo Molnar
2020-09-01 16:50     ` Catalin Marinas
2020-08-08  9:59   ` Dave Young
2020-08-01 13:08 ` [PATCH v11 3/5] arm64: kdump: reimplement crashkernel=X Chen Zhou
2020-09-02 17:09   ` Catalin Marinas
2020-09-03 11:26     ` chenzhou
2020-09-03 13:18       ` chenzhou
2020-09-04  3:04       ` Dave Young
2020-09-04  3:10         ` Dave Young
2020-09-04  4:02           ` chenzhou
2020-09-04  4:16             ` Dave Young
2020-09-04  6:39               ` chenzhou
2020-08-01 13:08 ` [PATCH v11 4/5] arm64: kdump: add memory for devices by DT property linux,usable-memory-range Chen Zhou
2020-08-01 13:08 ` [PATCH v11 5/5] kdump: update Documentation about crashkernel Chen Zhou
2020-08-08 10:02   ` Dave Young
2020-08-10  3:28     ` chenzhou
2020-08-10  5:59       ` Dave Young
2020-08-10  6:03       ` Dave Young
2020-08-18  7:07         ` chenzhou
2020-08-19 12:03           ` Dave Young
2020-08-28  1:59             ` chenzhou [this message]
2020-09-01 17:13           ` Catalin Marinas
2020-09-02 16:42           ` Catalin Marinas
2020-09-02 17:13   ` Catalin Marinas
2020-09-03 11:56     ` chenzhou
2020-08-06 11:37 ` [PATCH v11 0/5] support reserving crashkernel above 4G on arm64 kdump Dave Young

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