linux-kernel - Re: [PATCH V11 1/5] mm/hotplug: Introduce arch callback validating the hot remove range

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Date:   Mon, 13 Jan 2020 09:36:17 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     kbuild test robot <lkp@...el.com>
Cc:     mark.rutland@....com, david@...hat.com, catalin.marinas@....com,
        linux-mm@...ck.org, arunks@...eaurora.org, cpandya@...eaurora.org,
        will@...nel.org, ira.weiny@...el.com, steven.price@....com,
        valentin.schneider@....com, suzuki.poulose@....com,
        Robin.Murphy@....com, broonie@...nel.org, cai@....pw,
        ard.biesheuvel@....com, dan.j.williams@...el.com,
        linux-arm-kernel@...ts.infradead.org, osalvador@...e.de,
        kbuild-all@...ts.01.org, steve.capper@....com, logang@...tatee.com,
        linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        mgorman@...hsingularity.net
Subject: Re: [PATCH V11 1/5] mm/hotplug: Introduce arch callback validating
 the hot remove range



On 01/11/2020 07:41 PM, kbuild test robot wrote:
>    mm/memory_hotplug.c: In function 'check_hotremove_memory_range':
>>> mm/memory_hotplug.c:1027:7: error: implicit declaration of function 'arch_memory_removable'; did you mean 'add_memory_resource'? [-Werror=implicit-function-declaration]
>      rc = arch_memory_removable(start, size);
>           ^~~~~~~~~~~~~~~~~~~~~
>           add_memory_resource
>    At top level:
>    mm/memory_hotplug.c:1017:12: warning: 'check_hotremove_memory_range' defined but not used [-Wunused-function]
>     static int check_hotremove_memory_range(u64 start, u64 size)
>                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    cc1: some warnings being treated as errors
> 
> vim +1027 mm/memory_hotplug.c
> 
>   1016	
>   1017	static int check_hotremove_memory_range(u64 start, u64 size)
>   1018	{
>   1019		int rc;
>   1020	
>   1021		BUG_ON(check_hotplug_memory_range(start, size));
>   1022	
>   1023		/*
>   1024		 * First check if the platform is willing to have this
>   1025		 * memory range removed else just abort.
>   1026		 */
>> 1027		rc = arch_memory_removable(start, size);
>   1028		if (!rc)
>   1029			return -EINVAL;
>   1030	
>   1031		return 0;
>   1032	}
>   1033	


Both the build failures reported here could be solved by moving
check_hotremove_memory_range() inside CONFIG_MEMORY_HOTREMOVE
wrappers, will fix it.

- Anshuman