linux-kernel - Re: [RFC v2 4/6] crash hp: generic crash hotplug support infrastructure

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Date:   Thu, 9 Dec 2021 09:40:18 -0600
From:   Eric DeVolder <eric.devolder@...cle.com>
To:     David Hildenbrand <david@...hat.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, kexec@...ts.infradead.org, ebiederm@...ssion.com,
        dyoung@...hat.com, bhe@...hat.com, vgoyal@...hat.com
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com,
        nramas@...ux.microsoft.com, thomas.lendacky@....com,
        robh@...nel.org, efault@....de, rppt@...nel.org,
        konrad.wilk@...cle.com, boris.ostrovsky@...cle.com
Subject: Re: [RFC v2 4/6] crash hp: generic crash hotplug support
 infrastructure



On 12/8/21 07:38, David Hildenbrand wrote:
>> +#if defined(CONFIG_MEMORY_HOTPLUG)
>> +static int crash_memhp_notifier(struct notifier_block *nb,
>> +	unsigned long val, void *v)
>> +{
>> +	struct memory_notify *mhp = v;
>> +	unsigned long start, end;
>> +
>> +	start = mhp->start_pfn << PAGE_SHIFT;
>> +	end = ((mhp->start_pfn + mhp->nr_pages) << PAGE_SHIFT) - 1;
>> +
>> +	switch (val) {
>> +	case MEM_GOING_ONLINE:
>> +		crash_hotplug_handler(KEXEC_CRASH_HP_ADD_MEMORY,
>> +			start, end-start);
>> +		break;
>> +
>> +	case MEM_OFFLINE:
>> +	case MEM_CANCEL_ONLINE:
>> +		crash_hotplug_handler(KEXEC_CRASH_HP_REMOVE_MEMORY,
>> +			start, end-start);
> 
> Any reason you don't handle this after the effects completely, meaning
> MEM_ONLINE and MEM_OFFLINE?
> 

No, no reason. Great catch! I've changed it to use MEM_ONLINE/OFFLINE only.
Thanks!
eric