linux-kernel - Re: [PATCH v1] mm: relax deferred struct page requirements

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Message-Id: <20171117074711.GA3308@osiris>
Date:   Fri, 17 Nov 2017 08:47:11 +0100
From:   Heiko Carstens <heiko.carstens@...ibm.com>
To:     Pavel Tatashin <pasha.tatashin@...cle.com>
Cc:     steven.sistare@...cle.com, daniel.m.jordan@...cle.com,
        benh@...nel.crashing.org, paulus@...ba.org,
        akpm@...ux-foundation.org, kirill.shutemov@...ux.intel.com,
        arbab@...ux.vnet.ibm.com, schwidefsky@...ibm.com, x86@...nel.org,
        linux-kernel@...r.kernel.org, tglx@...utronix.de,
        linuxppc-dev@...ts.ozlabs.org, mhocko@...e.com, linux-mm@...ck.org,
        linux-s390@...r.kernel.org, mgorman@...hsingularity.net
Subject: Re: [PATCH v1] mm: relax deferred struct page requirements

On Thu, Nov 16, 2017 at 08:46:01PM -0500, Pavel Tatashin wrote:
> There is no need to have ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT,
> as all the page initialization code is in common code.
> 
> Also, there is no need to depend on MEMORY_HOTPLUG, as initialization code
> does not really use hotplug memory functionality. So, we can remove this
> requirement as well.
> 
> This patch allows to use deferred struct page initialization on all
> platforms with memblock allocator.
> 
> Tested on x86, arm64, and sparc. Also, verified that code compiles on
> PPC with CONFIG_MEMORY_HOTPLUG disabled.
> 
> Signed-off-by: Pavel Tatashin <pasha.tatashin@...cle.com>
> ---
>  arch/powerpc/Kconfig | 1 -
>  arch/s390/Kconfig    | 1 -
>  arch/x86/Kconfig     | 1 -
>  mm/Kconfig           | 7 +------
>  4 files changed, 1 insertion(+), 9 deletions(-)

For s390 the s390 bit:

Acked-by: Heiko Carstens <heiko.carstens@...ibm.com>