[PATCH 2/4] nvme-multipath: add the NVME_MULTIPATH_PARAM config option

[Nilay Shroff]

On 2/28/25 8:55 AM, John Meneghini wrote:
> The NVME_MULTIPATH_PARAM option controls the core.nvme_multipath module
> parameter. When NVME_MULTIPATH_PARAM=n the multipath parameter is removed
> and core nvme multipathing is enabled. When NVME_MULTIPATH_PARAM=y
> the multipath parameter is added and multipath support becomes
> configurable with the core.nvme_multipath parameter.
> 
> By default NVME_MULTIPATH_PARAM=y
> 
> Signed-off-by: John Meneghini <jmeneghi at redhat.com>
> ---
>  drivers/nvme/host/Kconfig     | 15 +++++++++++++++
>  drivers/nvme/host/multipath.c |  3 ++-
>  2 files changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/nvme/host/Kconfig b/drivers/nvme/host/Kconfig
> index 91b0346ce65a..c4251504f201 100644
> --- a/drivers/nvme/host/Kconfig
> +++ b/drivers/nvme/host/Kconfig
> @@ -28,6 +28,21 @@ config NVME_MULTIPATH
>  
>  	  If unsure, say Y.
>  
> +config NVME_MULTIPATH_PARAM
> +	bool "NVMe multipath param"
> +	depends on NVME_CORE && NVME_MULTIPATH
> +	help
> +	  This option enables configurable support for multipath access with
> +	  NVMe subsystems. If this option is enabled NVMe multipath support is
> +	  configured by the nvme core module parameter named "multipath". If
> +	  this option is disabled the nvme core module "multipath" parameter
> +	  is removed and support for NVMe multipath access can not be
> +	  configured. When this option is disabled a single /dev/nvmeXnY
> +	  device entry will be seen for each NVMe namespace, even if the
> +	  namespace is accessible through multiple controllers.
> +
> +	  If unsure, say Y.
> +
If we want to make NVME_MULTIPATH_PARAM default on then I think we need to add 
"default y" under config NVME_MULTIPATH_PARAM.

>  config NVME_VERBOSE_ERRORS
>  	bool "NVMe verbose error reporting"
>  	depends on NVME_CORE
> diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
> index 2a7635565083..4536ad5fbb82 100644
> --- a/drivers/nvme/host/multipath.c
> +++ b/drivers/nvme/host/multipath.c
> @@ -10,10 +10,11 @@
>  #include "nvme.h"
>  
>  bool multipath = true;
> +#ifdef NVME_MULTIPATH_PARAM

Shouldn't it be CONFIG_NVME_MULTIPATH_PARAM instead of NVME_MULTIPATH_PARAM?

Thanks,
--Nilay