[PATCH] arm64: mm: free unused memmap for sparse memory model that define VMEMMAP

Song Bao Hua (Barry Song) song.bao.hua at hisilicon.com
Wed Jul 8 03:18:39 EDT 2020



> -----Original Message-----
> From: liwei (CM)
> Sent: Wednesday, July 8, 2020 1:56 PM
> To: catalin.marinas at arm.com; will at kernel.org
> Cc: liwei (CM) <liwei213 at huawei.com>; fengbaopeng
> <fengbaopeng2 at hisilicon.com>; nsaenzjulienne at suse.de;
> steve.capper at arm.com; rppt at linux.ibm.com; Song Bao Hua (Barry Song)
> <song.bao.hua at hisilicon.com>; linux-arm-kernel at lists.infradead.org;
> linux-kernel at vger.kernel.org; sujunfei <sujunfei2 at hisilicon.com>
> Subject: [PATCH] arm64: mm: free unused memmap for sparse memory model
> that define VMEMMAP
> 
> For the memory hole, sparse memory model that define
> SPARSEMEM_VMEMMAP do not free the reserved memory for the page map,
> this patch do it.

Hello Wei,
Just curious if this patch breaks MEMORY_HOTPLUG?

> 
> Signed-off-by: Wei Li <liwei213 at huawei.com>
> Signed-off-by: Chen Feng <puck.chen at hisilicon.com>
> Signed-off-by: Xia Qing <saberlily.xia at hisilicon.com>
> ---
>  arch/arm64/mm/init.c | 81
> +++++++++++++++++++++++++++++++++++++++++++++-------
>  1 file changed, 71 insertions(+), 10 deletions(-)
> 
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index
> 1e93cfc7c47a..d1b56b47d5ba 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -441,7 +441,48 @@ void __init bootmem_init(void)
>  	memblock_dump_all();
>  }
> 

Thanks
Barry




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