linux-kernel - Re: linux-next: manual merge of the uml tree with the mm-stable tree

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Message-ID: <20250402102016.6ab2367d@canb.auug.org.au>
Date: Wed, 2 Apr 2025 10:20:16 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Richard Weinberger <richard@....at>, Andrew Morton
 <akpm@...ux-foundation.org>
Cc: Johannes Berg <johannes.berg@...el.com>, Linux Kernel Mailing List
 <linux-kernel@...r.kernel.org>, Linux Next Mailing List
 <linux-next@...r.kernel.org>, "Mike Rapoport (Microsoft)"
 <rppt@...nel.org>, Tiwei Bie <tiwei.btw@...group.com>
Subject: Re: linux-next: manual merge of the uml tree with the mm-stable
 tree

Hi all,

On Wed, 19 Mar 2025 10:55:54 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>
> Today's linux-next merge of the uml tree got a conflict in:
> 
>   arch/um/kernel/mem.c
> 
> between commits:
> 
>   0d98484ee333 ("arch, mm: introduce arch_mm_preinit")
>   8afa901c147a ("arch, mm: make releasing of memory to page allocator more explicit")
> 
> from the mm-stable tree and commit:
> 
>   e82cf3051e61 ("um: Update min_low_pfn to match changes in uml_reserved")
> 
> from the uml tree.
> 
> I fixed it up (I think - see below) and can carry the fix as
> necessary. This is now fixed as far as linux-next is concerned, but any
> non trivial conflicts should be mentioned to your upstream maintainer
> when your tree is submitted for merging.  You may also want to consider
> cooperating with the maintainer of the conflicting tree to minimise any
> particularly complex conflicts.
> 
> 
> diff --cc arch/um/kernel/mem.c
> index 379f33a1babf,61b5a5ede01c..000000000000
> --- a/arch/um/kernel/mem.c
> +++ b/arch/um/kernel/mem.c
> @@@ -66,11 -68,11 +68,12 @@@ void __init arch_mm_preinit(void
>   	map_memory(brk_end, __pa(brk_end), uml_reserved - brk_end, 1, 1, 0);
>   	memblock_free((void *)brk_end, uml_reserved - brk_end);
>   	uml_reserved = brk_end;
> + 	min_low_pfn = PFN_UP(__pa(uml_reserved));
>  -
>  -	/* this will put all low memory onto the freelists */
>  -	memblock_free_all();
>   	max_pfn = max_low_pfn;
>  +}
>  +
>  +void __init mem_init(void)
>  +{
>   	kmalloc_ok = 1;
>   }
>   

This is nw a conflict between the uml tree and Linus' tree.

-- 
Cheers,
Stephen Rothwell

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