linux-kernel - Re: linux-next: build failure after merge of the mm tree

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Date: Mon,  8 Apr 2024 13:44:58 +1200
From: Barry Song <21cnbao@...il.com>
To: sfr@...b.auug.org.au
Cc: akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org,
	linux-next@...r.kernel.org,
	v-songbaohua@...o.com
Subject: Re: linux-next: build failure after merge of the mm tree

> 
> Hi all,
> 
> After merging the mm tree, today's linux-next build (powerpc
> ppc64_defconfig) failed like this:
> 
> In file included from include/linux/mm.h:1115,
>                  from include/linux/mman.h:5,
>                  from arch/powerpc/kernel/asm-offsets.c:19:
> include/linux/huge_mm.h:276:23: error: variably modified 'stats' at file scope
>   276 |         unsigned long stats[PMD_ORDER + 1][__MTHP_STAT_COUNT];
>       |                       ^~~~~
> 
> Caused by commit
> 
>   d4358ee0a075 ("mm: add per-order mTHP anon_alloc and anon_alloc_fallback counters")
> 
> from the mm-unstable branch of the mm tree.
> 
> PMD_ORDER is not necessarily constant on PowerPC (since it depends on
> PTE_INDEX_SIZE).

Thanks!

There is a fix and tested by LTP, Yujie [1].

https://lore.kernel.org/all/20240407042247.201412-1-21cnbao@gmail.com/

> 
> I have reverted that commit (and the following one) for today.

Thanks
Barry