linux-kernel - Re: [PATCH 3/4] nvme: update the multipath warning in nvme_init_ns

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Message-ID: <abd856da-7ca6-419f-943b-80dcc885f68b@linux.ibm.com>
Date: Fri, 28 Feb 2025 11:58:58 +0530
From: Nilay Shroff <nilay@...ux.ibm.com>
To: John Meneghini <jmeneghi@...hat.com>, kbusch@...nel.org, hch@....de,
        sagi@...mberg.me
Cc: loberman@...hat.com, linux-nvme@...ts.infradead.org,
        linux-kernel@...r.kernel.org, emilne@...hat.com, bgurney@...hat.com
Subject: Re: [PATCH 3/4] nvme: update the multipath warning in
 nvme_init_ns_head



On 2/28/25 8:55 AM, John Meneghini wrote:
> The new NVME_MULTIPATH_PARAM config option requires updates
> to the warning message in nvme_init_ns_head(). Remove
> the old warning message and add new ones.
> 
> Signed-off-by: John Meneghini <jmeneghi@...hat.com>
> ---
>  drivers/nvme/host/core.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
> index 818d4e49aab5..c2b7e6834535 100644
> --- a/drivers/nvme/host/core.c
> +++ b/drivers/nvme/host/core.c
> @@ -3823,8 +3823,16 @@ static int nvme_init_ns_head(struct nvme_ns *ns, struct nvme_ns_info *info)
>  			dev_warn(ctrl->device,
>  				"Found shared namespace %d, but multipathing not supported.\n",
>  				info->nsid);
> +#ifdef CONFIG_NVME_MULTIPATH
> +#ifdef CONFIG_NVME_MULTIPATH_PARAM
> +			dev_warn_once(ctrl->device,
> +				"Shared namespace support requires core.nvme_multipath=Y.\n");
> +
> +#endif
> +#else
>  			dev_warn_once(ctrl->device,
> -				"Support for shared namespaces without CONFIG_NVME_MULTIPATH is deprecated and will be removed in Linux 6.0.\n");
> +				"Shared namespace support requires CONFIG_NVME_MULTIPATH.\n");
> +#endif
>  		}
>  	}
>  

As NVME_MULTIPATH_PARAM depends on NVME_MULTIPATH, it implicitly implies 
that if NVME_MULTIPATH_PARAM is enabled then NVME_MULTIPATH has to be on.
So above logic could be simplified.

However on another note, I really don't understand why do we need to add 
new warning here as there's already a warning present just above your
changes.

Thanks,
--Nilay