linux-kernel - Re: [PATCH] resource: Remove dependency on SPARSEMEM from GET_FREE

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Message-ID: <942d18c3-f9a8-482e-a166-c7c9d6fb28d7@redhat.com>
Date: Tue, 15 Oct 2024 09:07:07 +0200
From: David Hildenbrand <david@...hat.com>
To: Huang Ying <ying.huang@...el.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
 Guenter Roeck <linux@...ck-us.net>, Nathan Chancellor <nathan@...nel.org>,
 Arnd Bergmann <arnd@...db.de>, Dan Williams <dan.j.williams@...el.com>,
 Jonathan Cameron <jonathan.cameron@...wei.com>
Subject: Re: [PATCH] resource: Remove dependency on SPARSEMEM from
 GET_FREE_REGION

On 15.10.24 07:15, Huang Ying wrote:
> We want to use the functions configured via GET_FREE_REGION in
> resource kunit tests.  However, GET_FREE_REGION depends on SPARSEMEM.
> This makes resource kunit tests cannot be built on some architectures
> lacking SPARSEMEM.  In fact, these functions doesn't depend on
> SPARSEMEM now.  So, remove dependency on SPARSEMEM from
> GET_FREE_REGION.
> 
> Link: https://lore.kernel.org/lkml/20240922225041.603186-1-linux@roeck-us.net/
> Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
> Tested-by: Guenter Roeck <linux@...ck-us.net>
> Cc: Nathan Chancellor <nathan@...nel.org>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Jonathan Cameron <jonathan.cameron@...wei.com>
> ---
>   mm/Kconfig | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/mm/Kconfig b/mm/Kconfig
> index 4c9f5ea13271..33fa51d608dc 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -1085,7 +1085,6 @@ config HMM_MIRROR
>   	depends on MMU
>   
>   config GET_FREE_REGION
> -	depends on SPARSEMEM
>   	bool
>   
>   config DEVICE_PRIVATE

Added by

commit 14b80582c43e4f550acfd93c2b2cadbe36ea0874
Author: Dan Williams <dan.j.williams@...el.com>
Date:   Fri May 20 13:41:24 2022 -0700

     resource: Introduce alloc_free_mem_region()

@Dan, any insight why that dependency was added?

-- 
Cheers,

David / dhildenb