linux-kernel - Re: [PATCH v2 1/8] mm/memory_hotplug: Drop the flags field from struct mhp

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Message-ID: <c3c3c475-f828-13f7-b5c9-f691ef0fe1ff@redhat.com>
Date:   Wed, 8 Jan 2020 13:27:14 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Logan Gunthorpe <logang@...tatee.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-ia64@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, linux-mm@...ck.org,
        Dan Williams <dan.j.williams@...el.com>,
        Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Christoph Hellwig <hch@....de>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Eric Badger <ebadger@...aio.com>
Subject: Re: [PATCH v2 1/8] mm/memory_hotplug: Drop the flags field from
 struct mhp_restrictions

On 07.01.20 21:59, Logan Gunthorpe wrote:
> This variable is not used anywhere and should therefore be removed
> from the structure.
> 
> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
> ---
>  include/linux/memory_hotplug.h | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
> index ba0dca6aac6e..e47a29761088 100644
> --- a/include/linux/memory_hotplug.h
> +++ b/include/linux/memory_hotplug.h
> @@ -55,11 +55,9 @@ enum {
>  
>  /*
>   * Restrictions for the memory hotplug:
> - * flags:  MHP_ flags
>   * altmap: alternative allocator for memmap array
>   */
>  struct mhp_restrictions {
> -	unsigned long flags;
>  	struct vmem_altmap *altmap;
>  };

We wanted to use that for the "vmemmap on added memory" config knob. But
that might still take some time and we might actually realize it using
the altmap instead (hopefully :) ).

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb