linux-kernel - Re: [PATCH 7/8] s390/sclp: remove unhandled memory notifier type

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Date:   Thu, 16 Nov 2023 20:33:45 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Sumanth Korikkar <sumanthk@...ux.ibm.com>,
        linux-mm <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Oscar Salvador <osalvador@...e.de>, Michal Hocko <mhocko@...e.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        linux-s390 <linux-s390@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/8] s390/sclp: remove unhandled memory notifier type

On 14.11.23 19:02, Sumanth Korikkar wrote:
> Remove memory notifier types which are unhandled by s390.  Unhandled
> memory notifier types are covered by default case.
> 
> Suggested-by: Alexander Gordeev <agordeev@...ux.ibm.com>
> Reviewed-by: Gerald Schaefer <gerald.schaefer@...ux.ibm.com>
> Signed-off-by: Sumanth Korikkar <sumanthk@...ux.ibm.com>
> ---
>   drivers/s390/char/sclp_cmd.c | 8 --------
>   1 file changed, 8 deletions(-)
> 
> diff --git a/drivers/s390/char/sclp_cmd.c b/drivers/s390/char/sclp_cmd.c
> index 12f3d4af7e4e..428f8a583e8f 100644
> --- a/drivers/s390/char/sclp_cmd.c
> +++ b/drivers/s390/char/sclp_cmd.c
> @@ -349,11 +349,6 @@ static int sclp_mem_notifier(struct notifier_block *nb,
>   		if (contains_standby_increment(start, start + size))
>   			rc = -EPERM;
>   		break;
> -	case MEM_ONLINE:
> -	case MEM_CANCEL_OFFLINE:
> -		break;
> -	case MEM_GOING_ONLINE:
> -		break;
>   	case MEM_PHYS_ONLINE:
>   		rc = sclp_mem_change_state(start, size, 1);
>   		if (rc || !memory_block->altmap)
> @@ -369,9 +364,6 @@ static int sclp_mem_notifier(struct notifier_block *nb,
>   		 */
>   		__arch_set_page_nodat((void *)start, memory_block->altmap->free);
>   		break;
> -	case MEM_CANCEL_ONLINE:
> -	case MEM_OFFLINE:
> -		break;
>   	case MEM_PHYS_OFFLINE:
>   		if (memory_block->altmap)
>   			__remove_pages(arg->start_pfn, arg->nr_pages, memory_block->altmap);


You can remove MEM_ONLINE + MEM_CANCEL_OFFLINE ahead of time and just 
cleanup the others in the patch where you touch these cases.

-- 
Cheers,

David / dhildenb