linux-kernel - Re: [PATCH] crash_core: export vmemmap when CONFIG_SPARSEMEM

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Message-ID: <2414bcf0-d7d6-485e-ba68-8d13a28da8b5@amperemail.onmicrosoft.com>
Date: Wed, 17 Jan 2024 09:32:35 +0800
From: Shijie Huang <shijie@...eremail.onmicrosoft.com>
To: Baoquan He <bhe@...hat.com>, Huang Shijie
 <shijie@...amperecomputing.com>, akpm@...ux-foundation.org
Cc: vgoyal@...hat.com, dyoung@...hat.com, kexec@...ts.infradead.org,
 linux-kernel@...r.kernel.org, patches@...erecomputing.com
Subject: Re: [PATCH] crash_core: export vmemmap when CONFIG_SPARSEMEM_VMEMMAP
 is enabled

Hi Andrew,

在 2023/12/21 12:12, Baoquan He 写道:
> On 11/27/23 at 10:07am, Huang Shijie wrote:
>> In memory_model.h, if CONFIG_SPARSEMEM_VMEMMAP is configed,
>> kernel will use vmemmap to do the __pfn_to_page/page_to_pfn,
>> and kernel will not use the "classic sparse" to do the
>> __pfn_to_page/page_to_pfn.
>>
>> So export the vmemmap when CONFIG_SPARSEMEM_VMEMMAP is configed.
>> This makes the user applications (crash, etc) get faster
>> pfn_to_page/page_to_pfn operations too.
>>
>> Signed-off-by: Huang Shijie <shijie@...amperecomputing.com>
>> ---
>>   kernel/crash_core.c | 3 +++
>>   1 file changed, 3 insertions(+)
> Ack this one as it's needed by crash utility patches.
>
> Acked-by: Baoquan He <bhe@...hat.com>

Could you please merge this patch?


Thanks

Huang Shijie