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Date:   Wed, 4 Jul 2018 16:25:11 +0300
From:   Mike Rapoport <rppt@linux.vnet.ibm.com>
To:     Mark Salter <msalter@redhat.com>,
        Aurelien Jacquiot <jacquiot.aurelien@gmail.com>
Cc:     Michal Hocko <mhocko@kernel.org>,
        linux-c6x <linux-c6x-dev@vger.kernel.org>,
        linux-mm <linux-mm@kvack.org>,
        lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] c6x: switch to NO_BOOTMEM
References: <1530101360-5768-1-git-send-email-rppt@linux.vnet.ibm.com>
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Any comments on this?

On Wed, Jun 27, 2018 at 03:09:20PM +0300, Mike Rapoport wrote:
> The c6x is already using memblock and does most of early memory
> reservations with it, so it was only a matter of removing the bootmem
> initialization and handover of the memory from memblock to bootmem.
> 
> Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
> ---
>  arch/c6x/Kconfig        |  1 +
>  arch/c6x/kernel/setup.c | 26 +-------------------------
>  2 files changed, 2 insertions(+), 25 deletions(-)
> 
> diff --git a/arch/c6x/Kconfig b/arch/c6x/Kconfig
> index bf59855628ac..054c7c963180 100644
> --- a/arch/c6x/Kconfig
> +++ b/arch/c6x/Kconfig
> @@ -14,6 +14,7 @@ config C6X
>  	select GENERIC_IRQ_SHOW
>  	select HAVE_ARCH_TRACEHOOK
>  	select HAVE_MEMBLOCK
> +	select NO_BOOTMEM
>  	select SPARSE_IRQ
>  	select IRQ_DOMAIN
>  	select OF
> diff --git a/arch/c6x/kernel/setup.c b/arch/c6x/kernel/setup.c
> index 786e36e2f61d..cc74cb9d349b 100644
> --- a/arch/c6x/kernel/setup.c
> +++ b/arch/c6x/kernel/setup.c
> @@ -296,7 +296,6 @@ notrace void __init machine_init(unsigned long dt_ptr)
> 
>  void __init setup_arch(char **cmdline_p)
>  {
> -	int bootmap_size;
>  	struct memblock_region *reg;
> 
>  	printk(KERN_INFO "Initializing kernel\n");
> @@ -353,16 +352,6 @@ void __init setup_arch(char **cmdline_p)
>  	init_mm.end_data   = memory_start;
>  	init_mm.brk        = memory_start;
> 
> -	/*
> -	 * Give all the memory to the bootmap allocator,  tell it to put the
> -	 * boot mem_map at the start of memory
> -	 */
> -	bootmap_size = init_bootmem_node(NODE_DATA(0),
> -					 memory_start >> PAGE_SHIFT,
> -					 PAGE_OFFSET >> PAGE_SHIFT,
> -					 memory_end >> PAGE_SHIFT);
> -	memblock_reserve(memory_start, bootmap_size);
> -
>  	unflatten_device_tree();
> 
>  	c6x_cache_init();
> @@ -397,22 +386,9 @@ void __init setup_arch(char **cmdline_p)
>  	/* Initialize the coherent memory allocator */
>  	coherent_mem_init(dma_start, dma_size);
> 
> -	/*
> -	 * Free all memory as a starting point.
> -	 */
> -	free_bootmem(PAGE_OFFSET, memory_end - PAGE_OFFSET);
> -
> -	/*
> -	 * Then reserve memory which is already being used.
> -	 */
> -	for_each_memblock(reserved, reg) {
> -		pr_debug("reserved - 0x%08x-0x%08x\n",
> -			 (u32) reg->base, (u32) reg->size);
> -		reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
> -	}
> -
>  	max_low_pfn = PFN_DOWN(memory_end);
>  	min_low_pfn = PFN_UP(memory_start);
> +	max_pfn = max_low_pfn;
>  	max_mapnr = max_low_pfn - min_low_pfn;
> 
>  	/* Get kmalloc into gear */
> -- 
> 2.7.4
> 

-- 
Sincerely yours,
Mike.