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Date:   Mon, 6 Jan 2020 08:04:58 +0200
From:   Mike Rapoport <rppt@linux.ibm.com>
To:     Anshuman Khandual <anshuman.khandual@arm.com>
Cc:     linux-mm@kvack.org, Heiko Carstens <heiko.carstens@de.ibm.com>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Collin Walling <walling@linux.ibm.com>,
        Gerald Schaefer <gerald.schaefer@de.ibm.com>,
        Philipp Rudo <prudo@linux.ibm.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm/memblock: Define memblock_physmem_add()
References: <1578283835-21969-1-git-send-email-anshuman.khandual@arm.com>
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On Mon, Jan 06, 2020 at 09:40:35AM +0530, Anshuman Khandual wrote:
> On s390 platform memblock.physmem array is being built by directly calling
> into memblock_add_range() which is a low level function not intended to be
> used outside of memblock. Hence lets conditionally add helper functions for
> physmem array when HAVE_MEMBLOCK_PHYS_MAP is enabled. Also use MAX_NUMNODES
> instead of 0 as node ID similar to memblock_add() and memblock_reserve().
> Make memblock_add_range() a static function as it is no longer getting used
> outside of memblock.
> 
> Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
> Cc: Vasily Gorbik <gor@linux.ibm.com>
> Cc: Christian Borntraeger <borntraeger@de.ibm.com>
> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
> Cc: Collin Walling <walling@linux.ibm.com>
> Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
> Cc: Philipp Rudo <prudo@linux.ibm.com>
> Cc: Mike Rapoport <rppt@linux.ibm.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: linux-s390@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>

Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>

> ---
> Only build tested for s390, will appreciate if some one can give it a try
> on a real system.
> 
> Changes from RFC:
> 
> - Dropped all memblock_dbg() changes per Mike
> - Renamed memblock_physmem() as memblock_physmem_add() per Mike
> - Made memblock_add_range() a static function per Mike
> - Updated the commit message
> 
> RFC: (https://patchwork.kernel.org/patch/11316627/)
> 
>  arch/s390/kernel/setup.c | 12 +++---------
>  include/linux/memblock.h |  7 +++----
>  mm/memblock.c            | 14 +++++++++++++-
>  3 files changed, 19 insertions(+), 14 deletions(-)
> 
> diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
> index b9104ae162f4..424cb8fd2c35 100644
> --- a/arch/s390/kernel/setup.c
> +++ b/arch/s390/kernel/setup.c
> @@ -762,14 +762,6 @@ static void __init free_mem_detect_info(void)
>  		memblock_free(start, size);
>  }
>  
> -static void __init memblock_physmem_add(phys_addr_t start, phys_addr_t size)
> -{
> -	memblock_dbg("memblock_physmem_add: [%#016llx-%#016llx]\n",
> -		     start, start + size - 1);
> -	memblock_add_range(&memblock.memory, start, size, 0, 0);
> -	memblock_add_range(&memblock.physmem, start, size, 0, 0);
> -}
> -
>  static const char * __init get_mem_info_source(void)
>  {
>  	switch (mem_detect.info_source) {
> @@ -794,8 +786,10 @@ static void __init memblock_add_mem_detect_info(void)
>  		     get_mem_info_source(), mem_detect.info_source);
>  	/* keep memblock lists close to the kernel */
>  	memblock_set_bottom_up(true);
> -	for_each_mem_detect_block(i, &start, &end)
> +	for_each_mem_detect_block(i, &start, &end) {
> +		memblock_add(start, end - start);
>  		memblock_physmem_add(start, end - start);
> +	}
>  	memblock_set_bottom_up(false);
>  	memblock_dump_all();
>  }
> diff --git a/include/linux/memblock.h b/include/linux/memblock.h
> index b38bbefabfab..079d17d96410 100644
> --- a/include/linux/memblock.h
> +++ b/include/linux/memblock.h
> @@ -113,6 +113,9 @@ int memblock_add(phys_addr_t base, phys_addr_t size);
>  int memblock_remove(phys_addr_t base, phys_addr_t size);
>  int memblock_free(phys_addr_t base, phys_addr_t size);
>  int memblock_reserve(phys_addr_t base, phys_addr_t size);
> +#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
> +int memblock_physmem_add(phys_addr_t base, phys_addr_t size);
> +#endif
>  void memblock_trim_memory(phys_addr_t align);
>  bool memblock_overlaps_region(struct memblock_type *type,
>  			      phys_addr_t base, phys_addr_t size);
> @@ -127,10 +130,6 @@ void reset_node_managed_pages(pg_data_t *pgdat);
>  void reset_all_zones_managed_pages(void);
>  
>  /* Low level functions */
> -int memblock_add_range(struct memblock_type *type,
> -		       phys_addr_t base, phys_addr_t size,
> -		       int nid, enum memblock_flags flags);
> -
>  void __next_mem_range(u64 *idx, int nid, enum memblock_flags flags,
>  		      struct memblock_type *type_a,
>  		      struct memblock_type *type_b, phys_addr_t *out_start,
> diff --git a/mm/memblock.c b/mm/memblock.c
> index 4bc2c7d8bf42..fc0d4db1d646 100644
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -575,7 +575,7 @@ static void __init_memblock memblock_insert_region(struct memblock_type *type,
>   * Return:
>   * 0 on success, -errno on failure.
>   */
> -int __init_memblock memblock_add_range(struct memblock_type *type,
> +static int __init_memblock memblock_add_range(struct memblock_type *type,
>  				phys_addr_t base, phys_addr_t size,
>  				int nid, enum memblock_flags flags)
>  {
> @@ -830,6 +830,18 @@ int __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size)
>  	return memblock_add_range(&memblock.reserved, base, size, MAX_NUMNODES, 0);
>  }
>  
> +#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
> +int __init_memblock memblock_physmem_add(phys_addr_t base, phys_addr_t size)
> +{
> +	phys_addr_t end = base + size - 1;
> +
> +	memblock_dbg("%s: [%pa-%pa] %pS\n", __func__,
> +		     &base, &end, (void *)_RET_IP_);
> +
> +	return memblock_add_range(&memblock.physmem, base, size, MAX_NUMNODES, 0);
> +}
> +#endif
> +
>  /**
>   * memblock_setclr_flag - set or clear flag for a memory region
>   * @base: base address of the region
> -- 
> 2.20.1
> 

-- 
Sincerely yours,
Mike.