linux-kernel - Re: [PATCH v2 17/17] memblock: use separate iterators for memory and reserved regions

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Message-ID: <20200805092948.GX10792@MiWiFi-R3L-srv>
Date:   Wed, 5 Aug 2020 17:29:48 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoph Hellwig <hch@....de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Emil Renner Berthing <kernel@...il.dk>,
        Ingo Molnar <mingo@...hat.com>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Simek <monstr@...str.eu>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Mackerras <paulus@...ba.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Russell King <linux@...linux.org.uk>,
        Stafford Horne <shorne@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        clang-built-linux@...glegroups.com,
        iommu@...ts.linux-foundation.org, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-c6x-dev@...ux-c6x.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, linuxppc-dev@...ts.ozlabs.org,
        openrisc@...ts.librecores.org, sparclinux@...r.kernel.org,
        uclinux-h8-devel@...ts.sourceforge.jp, x86@...nel.org
Subject: Re: [PATCH v2 17/17] memblock: use separate iterators for memory and
 reserved regions

On 08/02/20 at 07:36pm, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@...ux.ibm.com>
> 
> for_each_memblock() is used to iterate over memblock.memory in
> a few places that use data from memblock_region rather than the memory
> ranges.
> 
> Introduce separate for_each_mem_region() and for_each_reserved_mem_region()
> to improve encapsulation of memblock internals from its users.
> 
> Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
> ---
>  .clang-format                  |  3 ++-
>  arch/arm64/kernel/setup.c      |  2 +-
>  arch/arm64/mm/numa.c           |  2 +-
>  arch/mips/netlogic/xlp/setup.c |  2 +-
>  arch/x86/mm/numa.c             |  2 +-
>  include/linux/memblock.h       | 19 ++++++++++++++++---
>  mm/memblock.c                  |  4 ++--
>  mm/page_alloc.c                |  8 ++++----
>  8 files changed, 28 insertions(+), 14 deletions(-)
> 
...

> diff --git a/include/linux/memblock.h b/include/linux/memblock.h
> index 9e51b3fd4134..a6970e058bd7 100644
> --- a/include/linux/memblock.h
> +++ b/include/linux/memblock.h
> @@ -522,9 +522,22 @@ static inline unsigned long memblock_region_reserved_end_pfn(const struct memblo
>  	return PFN_UP(reg->base + reg->size);
>  }
>  
> -#define for_each_memblock(memblock_type, region)					\
> -	for (region = memblock.memblock_type.regions;					\
> -	     region < (memblock.memblock_type.regions + memblock.memblock_type.cnt);	\
> +/**
> + * for_each_mem_region - itereate over registered memory regions
                                          ~~~~~~~~~~~~~~~~~

Wonder why emphasize 'registered' memory.

Other than this confusion to me, this patch looks good.

Reviewed-by: Baoquan He <bhe@...hat.com>