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

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

[Jason Wang]

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@huawei.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@redhat.com>

_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization

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

[Weilong Chen]

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@huawei.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.
-- 
2.17.1

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

[Michael S. Tsirkin]

On Fri, Jun 19, 2020 at 04:03:33PM +0800, 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@huawei.com>

Cc virtio mem maintainer:
M:      David Hildenbrand <david@redhat.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.
> -- 
> 2.17.1

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

[David Hildenbrand]

On 19.06.20 10:03, 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."

Right, rings a bell.

> Config VIRTIO_MEM should not select CONTIG_ALLOC directly.
> Otherwise it will cause an error:
> https://bugzilla.kernel.org/show_bug.cgi?id=208245

Thanks!

Acked-by: David Hildenbrand <david@redhat.com>

> 
> Signed-off-by: Weilong Chen <chenweilong@huawei.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.
> 


-- 
Thanks,

David / dhildenb