Re: [PATCH] crash_core: export vmemmap when CONFIG_SPARSEMEM_VMEMMAP is enabled

From: Shijie Huang <shijie@amperemail.onmicrosoft.com>
To: Baoquan He <bhe@redhat.com>,
	Huang Shijie <shijie@os.amperecomputing.com>,
	akpm@linux-foundation.org
Cc: vgoyal@redhat.com, dyoung@redhat.com, kexec@lists.infradead.org,
	linux-kernel@vger.kernel.org, patches@amperecomputing.com
Subject: Re: [PATCH] crash_core: export vmemmap when CONFIG_SPARSEMEM_VMEMMAP is enabled
Date: Wed, 17 Jan 2024 09:32:35 +0800	[thread overview]
Message-ID: <2414bcf0-d7d6-485e-ba68-8d13a28da8b5@amperemail.onmicrosoft.com> (raw)
In-Reply-To: <ZYO7MvpT9yWWfjO7@MiWiFi-R3L-srv>

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@os.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@redhat.com>

Could you please merge this patch?

Thanks

Huang Shijie

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