linux-kernel - Re: [PATCH 2/2] of: reserved_mem: Remove reserved regions count restriction

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Date:   Fri, 19 Nov 2021 18:30:09 +0800
From:   Calvin Zhang <calvinzhang.cool@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Calvin Zhang <calvinzhang.cool@...il.com>,
        Vineet Gupta <vgupta@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Guo Ren <guoren@...nel.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
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Subject: Re: [PATCH 2/2] of: reserved_mem: Remove reserved regions count
 restriction

On Fri, Nov 19, 2021 at 11:56:08AM +0200, Andy Shevchenko wrote:
>On Fri, Nov 19, 2021 at 03:58:19PM +0800, Calvin Zhang wrote:
>> Change to allocate reserved_mems dynamically. Static reserved regions
>> must be reserved before any memblock allocations. The reserved_mems
>> array couldn't be allocated until memblock and linear mapping are ready.
>> 
>> So move the allocation and initialization of records and reserved memory
>> from early_init_fdt_scan_reserved_mem() to of_reserved_mem_init().
>
>>  arch/arc/mm/init.c                 |  3 ++
>>  arch/arm/kernel/setup.c            |  2 +
>>  arch/arm64/kernel/setup.c          |  3 ++
>>  arch/csky/kernel/setup.c           |  3 ++
>>  arch/h8300/kernel/setup.c          |  2 +
>>  arch/mips/kernel/setup.c           |  3 ++
>>  arch/nds32/kernel/setup.c          |  3 ++
>>  arch/nios2/kernel/setup.c          |  2 +
>>  arch/openrisc/kernel/setup.c       |  3 ++
>>  arch/powerpc/kernel/setup-common.c |  3 ++
>>  arch/riscv/kernel/setup.c          |  2 +
>>  arch/sh/kernel/setup.c             |  3 ++
>>  arch/xtensa/kernel/setup.c         |  2 +
>
>Isn't x86 missed? Is it on purpose?
>Would be nice to have this in the commit message or fixed accordingly.
AFAIK, x86 doesn't reserve memory through "/reserved-memory" node until now.
Actually, I got the arch list from callers of
early_init_fdt_scan_reserved_mem().
>
>-- 
>With Best Regards,
>Andy Shevchenko
>
>
>
Thanks,
Calvin