linux-kernel - Re: [PATCH v2] sh: Call paging_init() earlier in the init sequence

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Date: Mon, 29 Apr 2024 11:03:15 +0200
From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
To: Oreoluwa Babatunde <quic_obabatun@...cinc.com>, 
	ysato@...rs.sourceforge.jp, dalias@...c.org
Cc: akpm@...ux-foundation.org, linux-sh@...r.kernel.org, 
 linux-kernel@...r.kernel.org, robh+dt@...nel.org, kernel@...cinc.com, Rob
 Herring <robh@...nel.org>
Subject: Re: [PATCH v2] sh: Call paging_init() earlier in the init sequence

Hi Oreoluwa,

On Tue, 2024-04-23 at 16:31 -0700, Oreoluwa Babatunde wrote:
> The unflatten_device_tree() function contains a call to
> memblock_alloc(). This is a problem because this allocation is done
> before any of the reserved memory is set aside in paging_init().
> This means that there is a possibility for memblock to allocate from
> any of the memory regions that are supposed to be set aside as reserved.
> 
> Hence, move the call to paging_init() to be earlier in the init
> sequence so that the reserved memory regions are set aside before any
> allocations are done using memblock.
> 
> Reviewed-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Oreoluwa Babatunde <quic_obabatun@...cinc.com>
> ---
> v2:
> - Added Rob Herrings Reviewed-by.
> - cc Andrew Morton to assist with merging this for sh architecture.
>   Similar change made for loongarch and openrisc in v1 have already
>   been merged.

Could you link the changes for references so I can have a look?

> v1:
> https://lore.kernel.org/all/1707524971-146908-4-git-send-email-quic_obabatun@quicinc.com/
> 
>  arch/sh/kernel/setup.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
> index 620e5cf8ae1e..98c8473e130d 100644
> --- a/arch/sh/kernel/setup.c
> +++ b/arch/sh/kernel/setup.c
> @@ -322,6 +322,8 @@ void __init setup_arch(char **cmdline_p)
>  	/* Let earlyprintk output early console messages */
>  	sh_early_platform_driver_probe("earlyprintk", 1, 1);
>  
> +	paging_init();
> +
>  #ifdef CONFIG_OF_EARLY_FLATTREE
>  #ifdef CONFIG_USE_BUILTIN_DTB
>  	unflatten_and_copy_device_tree();
> @@ -330,8 +332,6 @@ void __init setup_arch(char **cmdline_p)
>  #endif
>  #endif
>  
> -	paging_init();
> -
>  	/* Perform the machine specific initialisation */
>  	if (likely(sh_mv.mv_setup))
>  		sh_mv.mv_setup(cmdline_p);

Reviewed-by: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>

Adrian

-- 
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