linux-kernel - Re: [PATCH] x86/numa_emulation: Fix uniform size build failure

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Message-ID: <20180705082435.GA29656@gmail.com>
Date:   Thu, 5 Jul 2018 10:24:35 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     David Rientjes <rientjes@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Wei Yang <richard.weiyang@...il.com>,
        kbuild test robot <lkp@...el.com>, x86@...nel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/numa_emulation: Fix uniform size build failure


* Dan Williams <dan.j.williams@...el.com> wrote:

> The calculation of a uniform numa-node size attempted to perform
> division with a 64-bit diviser leading to the following failure on
> 32-bit:
> 
>     arch/x86/mm/numa_emulation.o: In function `split_nodes_size_interleave_uniform':
>     arch/x86/mm/numa_emulation.c:239: undefined reference to `__udivdi3'
> 
> Convert the implementation to do the division in terms of pages and then
> shift the result back to an absolute physical address.
> 
> Fixes: 93e738834fcc ("x86/numa_emulation: Introduce uniform split capability")
> Cc: David Rientjes <rientjes@...gle.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Wei Yang <richard.weiyang@...il.com>
> Reported-by: kbuild test robot <lkp@...el.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>

I'm still getting this link failure on 32-bit kernels:

 arch/x86/mm/numa_emulation.o: In function `split_nodes_size_interleave_uniform.constprop.1':
 numa_emulation.c:(.init.text+0x669): undefined reference to `__udivdi3'
 Makefile:1005: recipe for target 'vmlinux' failed

config attached.

These numa_emulation changes are a bit of a trainwreck - I'm removing both 
num_emulation commits from -tip for now, could you please resubmit a fixed/tested 
combo version?

Thanks,

	Ingo