linux-kernel - Re: [PATCHv5 2/2] arm: Get rid of meminfo

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Message-Id: <20140501130849.C093DC409DA@trevor.secretlab.ca>
Date:	Thu, 01 May 2014 14:08:49 +0100
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Laura Abbott <lauraa@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	David Brown <davidb@...eaurora.org>,
	Daniel Walker <dwalker@...o99.com>,
	Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Eric Miao <eric.y.miao@...il.com>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Ben Dooks <ben-linux@...ff.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	linux-arm-kernel@...ts.infradead.org
Cc:	Laura Abbott <lauraa@...eaurora.org>, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Catalin Marinas <catalin.marinas@....com>,
	Rob Herring <robherring2@...il.com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Will Deacon <will.deacon@....com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	Courtney Cavin <courtney.cavin@...ymobile.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCHv5 2/2] arm: Get rid of meminfo

On Thu,  3 Apr 2014 10:04:58 -0700, Laura Abbott <lauraa@...eaurora.org> wrote:
> memblock is now fully integrated into the kernel and is the prefered
> method for tracking memory. Rather than reinvent the wheel with
> meminfo, migrate to using memblock directly instead of meminfo as
> an intermediate.
> 
> Change-Id: I9d04e636f43bf939e13b4934dc23da0c076811d2
> Acked-by: Jason Cooper <jason@...edaemon.net>
> Acked-by: Catalin Marinas <catalin.marinas@....com>
> Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>
> Tested-by: Leif Lindholm <leif.lindholm@...aro.org>
> Signed-off-by: Laura Abbott <lauraa@...eaurora.org>

Tested-by: Grant Likely <grant.likely@...aro.org>

Tiny nit-picking comment below, but this patch looks really good.
What's the state on merging this?

> diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
> index 97c293e..40e14a1 100644
> --- a/arch/arm/mm/init.c
> +++ b/arch/arm/mm/init.c
> @@ -415,54 +400,53 @@ free_memmap(unsigned long start_pfn, unsigned long end_pfn)
>  /*
>   * The mem_map array can get very big.  Free the unused area of the memory map.
>   */
> -static void __init free_unused_memmap(struct meminfo *mi)
> +static void __init free_unused_memmap(void)
>  {
> -	unsigned long bank_start, prev_bank_end = 0;
> -	unsigned int i;
> +	unsigned long start, prev_end = 0;
> +	struct memblock_region *reg;
>  
>  	/*
>  	 * This relies on each bank being in address order.
>  	 * The banks are sorted previously in bootmem_init().
>  	 */
> -	for_each_bank(i, mi) {
> -		struct membank *bank = &mi->bank[i];
> -
> -		bank_start = bank_pfn_start(bank);
> +	for_each_memblock(memory, reg) {
> +		start = memblock_region_memory_base_pfn(reg);
>  
>  #ifdef CONFIG_SPARSEMEM
>  		/*
>  		 * Take care not to free memmap entries that don't exist
>  		 * due to SPARSEMEM sections which aren't present.
>  		 */
> -		bank_start = min(bank_start,
> -				 ALIGN(prev_bank_end, PAGES_PER_SECTION));
> +		start = min(start,
> +				 ALIGN(prev_end, PAGES_PER_SECTION));

Nit: The line doesn't need to be split anymore.

>  #else
>  		/*
>  		 * Align down here since the VM subsystem insists that the
>  		 * memmap entries are valid from the bank start aligned to
>  		 * MAX_ORDER_NR_PAGES.
>  		 */
> -		bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
> +		start = round_down(start, MAX_ORDER_NR_PAGES);
>  #endif
>  		/*
>  		 * If we had a previous bank, and there is a space
>  		 * between the current bank and the previous, free it.
>  		 */
> -		if (prev_bank_end && prev_bank_end < bank_start)
> -			free_memmap(prev_bank_end, bank_start);
> +		if (prev_end && prev_end < start)
> +			free_memmap(prev_end, start);
>  
>  		/*
>  		 * Align up here since the VM subsystem insists that the
>  		 * memmap entries are valid from the bank end aligned to
>  		 * MAX_ORDER_NR_PAGES.
>  		 */
> -		prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
> +		prev_end = ALIGN(memblock_region_memory_end_pfn(reg),
> +				 MAX_ORDER_NR_PAGES);
>  	}
>  
>  #ifdef CONFIG_SPARSEMEM
> -	if (!IS_ALIGNED(prev_bank_end, PAGES_PER_SECTION))
> -		free_memmap(prev_bank_end,
> -			    ALIGN(prev_bank_end, PAGES_PER_SECTION));
> +	if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
> +		free_memmap(prev_end,
> +			    ALIGN(prev_end, PAGES_PER_SECTION));

Ditto

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