linux-kernel - Re: [PATCH 2/3] openrisc: Call setup_memory() earlier in the init sequence

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Date: Fri, 8 Mar 2024 22:27:48 +0000
From: Stafford Horne <shorne@...il.com>
To: Oreoluwa Babatunde <quic_obabatun@...cinc.com>
Cc: chenhuacai@...nel.org, jonas@...thpole.se,
	stefan.kristiansson@...nalahti.fi, ysato@...rs.sourceforge.jp,
	dalias@...c.org, glaubitz@...sik.fu-berlin.de, robh+dt@...nel.org,
	frowand.list@...il.com, linux-openrisc@...r.kernel.org,
	loongarch@...ts.linux.dev, linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	kernel@...cinc.com
Subject: Re: [PATCH 2/3] openrisc: Call setup_memory() earlier in the init
 sequence

On Fri, Feb 09, 2024 at 04:29:30PM -0800, Oreoluwa Babatunde wrote:
> The unflatten_and_copy_device_tree() function contains a call to
> memblock_alloc(). This means that memblock is allocating memory before
> any of the reserved memory regions are set aside in the setup_memory()
> function which calls early_init_fdt_scan_reserved_mem(). Therefore,
> there is a possibility for memblock to allocate from any of the
> reserved memory regions.
> 
> Hence, move the call to setup_memory() to be earlier in the init
> sequence so that the reserved memory regions are set aside before any
> allocations are done using memblock.
> 
> Signed-off-by: Oreoluwa Babatunde <quic_obabatun@...cinc.com>
> ---
>  arch/openrisc/kernel/setup.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/openrisc/kernel/setup.c b/arch/openrisc/kernel/setup.c
> index 9cf7fb6..be56eaa 100644
> --- a/arch/openrisc/kernel/setup.c
> +++ b/arch/openrisc/kernel/setup.c
> @@ -255,6 +255,9 @@ void calibrate_delay(void)
>  
>  void __init setup_arch(char **cmdline_p)
>  {
> +	/* setup memblock allocator */
> +	setup_memory();
> +
>  	unflatten_and_copy_device_tree();
>  
>  	setup_cpuinfo();
> @@ -278,9 +281,6 @@ void __init setup_arch(char **cmdline_p)
>  	}
>  #endif
>  
> -	/* setup memblock allocator */
> -	setup_memory();
> -
>  	/* paging_init() sets up the MMU and marks all pages as reserved */
>  	paging_init();

This looks good.  I will merge it via the openrisc queue as you requested.

-Stafford