linux-kernel - Re: [PATCH] virtio-mem: Fix build error due to improper use 'select'

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Message-ID: <953448d3-9e7c-3a96-b28b-edaf8b775e4d@redhat.com>
Date:   Fri, 19 Jun 2020 15:54:19 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Weilong Chen <chenweilong@...wei.com>, mst@...hat.com,
        virtualization@...ts.linux-foundation.org, lizefan@...wei.com
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] virtio-mem: Fix build error due to improper use 'select'


On 2020/6/19 下午4:03, Weilong Chen wrote:
> As noted in:
> https://www.kernel.org/doc/Documentation/kbuild/kconfig-language.txt
> "select should be used with care. select will force a symbol to a
> value without visiting the dependencies."
> Config VIRTIO_MEM should not select CONTIG_ALLOC directly.
> Otherwise it will cause an error:
> https://bugzilla.kernel.org/show_bug.cgi?id=208245
>
> Signed-off-by: Weilong Chen <chenweilong@...wei.com>
> ---
>   drivers/virtio/Kconfig | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig
> index 5809e5f5b157..5c92e4a50882 100644
> --- a/drivers/virtio/Kconfig
> +++ b/drivers/virtio/Kconfig
> @@ -85,7 +85,7 @@ config VIRTIO_MEM
>   	depends on VIRTIO
>   	depends on MEMORY_HOTPLUG_SPARSE
>   	depends on MEMORY_HOTREMOVE
> -	select CONTIG_ALLOC
> +	depends on CONTIG_ALLOC
>   	help
>   	 This driver provides access to virtio-mem paravirtualized memory
>   	 devices, allowing to hotplug and hotunplug memory.


Acked-by: Jason Wang <jasowang@...hat.com>