linux-kernel - Re: [PATCH v2 3/5] memblock: allow to specify flags with memblock_add

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Date:   Mon, 4 Oct 2021 19:31:41 +0000
From:   Shahab Vahedi <Shahab.Vahedi@...opsys.com>
To:     David Hildenbrand <david@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...nel.org>,
        Michal Hocko <mhocko@...e.com>,
        Oscar Salvador <osalvador@...e.de>,
        Jianyong Wu <Jianyong.Wu@....com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Vineet Gupta <vgupta@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Arnd Bergmann <arnd@...db.de>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        "linux-m68k@...ts.linux-m68k.org" <linux-m68k@...ts.linux-m68k.org>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "kexec@...ts.infradead.org" <kexec@...ts.infradead.org>
Subject: Re: [PATCH v2 3/5] memblock: allow to specify flags with
 memblock_add_node()

On 10/4/21 11:36 AM, David Hildenbrand wrote:
> We want to specify flags when hotplugging memory. Let's prepare to pass
> flags to memblock_add_node() by adjusting all existing users.
> 
> Note that when hotplugging memory the system is already up and running
> and we might have concurrent memblock users: for example, while we're
> hotplugging memory, kexec_file code might search for suitable memory
> regions to place kexec images. It's important to add the memory directly
> to memblock via a single call with the right flags, instead of adding the
> memory first and apply flags later: otherwise, concurrent memblock users
> might temporarily stumble over memblocks with wrong flags, which will be
> important in a follow-up patch that introduces a new flag to properly
> handle add_memory_driver_managed().
> 
> Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> Acked-by: Heiko Carstens <hca@...ux.ibm.com>
> Signed-off-by: David Hildenbrand <david@...hat.com>
> ---
>  arch/arc/mm/init.c               | 4 ++--
>  arch/ia64/mm/contig.c            | 2 +-
>  arch/ia64/mm/init.c              | 2 +-
>  arch/m68k/mm/mcfmmu.c            | 3 ++-
>  arch/m68k/mm/motorola.c          | 6 ++++--
>  arch/mips/loongson64/init.c      | 4 +++-
>  arch/mips/sgi-ip27/ip27-memory.c | 3 ++-
>  arch/s390/kernel/setup.c         | 3 ++-
>  include/linux/memblock.h         | 3 ++-
>  include/linux/mm.h               | 2 +-
>  mm/memblock.c                    | 9 +++++----
>  mm/memory_hotplug.c              | 2 +-
>  12 files changed, 26 insertions(+), 17 deletions(-)
> 
> diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
> index 699ecf119641..110eb69e9bee 100644
> --- a/arch/arc/mm/init.c
> +++ b/arch/arc/mm/init.c
> @@ -59,13 +59,13 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size)
>  
>  		low_mem_sz = size;
>  		in_use = 1;
> -		memblock_add_node(base, size, 0);
> +		memblock_add_node(base, size, 0, MEMBLOCK_NONE);
>  	} else {
>  #ifdef CONFIG_HIGHMEM
>  		high_mem_start = base;
>  		high_mem_sz = size;
>  		in_use = 1;
> -		memblock_add_node(base, size, 1);
> +		memblock_add_node(base, size, 1, MEMBLOCK_NONE);
>  		memblock_reserve(base, size);
>  #endif

arch/arc part: Acked-by: Shahab Vahedi <shahab@...opsys.com>

-- 
Shahab