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Date: Tue, 9 Sep 2025 16:53:36 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Brian Norris <briannorris@chromium.org>
Cc: David Hildenbrand <david@redhat.com>, linux-kernel@vger.kernel.org,
 Michal Hocko <mhocko@suse.com>, Mike Rapoport <rppt@kernel.org>, Lorenzo
 Stoakes <lorenzo.stoakes@oracle.com>, Suren Baghdasaryan
 <surenb@google.com>, Vlastimil Babka <vbabka@suse.cz>, linux-mm@kvack.org,
 "Liam R. Howlett" <Liam.Howlett@oracle.com>
Subject: Re: [PATCH] mm: vm_event_item: Explicit #include for THREAD_SIZE
Message-Id: <20250909165336.c9505e477461fd5e41e6cfe4@linux-foundation.org>
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References: <20250909201419.827638-1-briannorris@chromium.org>
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On Tue,  9 Sep 2025 13:13:57 -0700 Brian Norris <briannorris@chromium.org> wrote:

> This header uses THREAD_SIZE, which is provided by the thread_info.h
> header but is not included in this header. Depending on the #include
> ordering in other files, this can produce preprocessor errors.
> 
> ...
>
> --- a/include/linux/vm_event_item.h
> +++ b/include/linux/vm_event_item.h
> @@ -2,6 +2,8 @@
>  #ifndef VM_EVENT_ITEM_H_INCLUDED
>  #define VM_EVENT_ITEM_H_INCLUDED
>  
> +#include <linux/thread_info.h>
> +
>  #ifdef CONFIG_ZONE_DMA
>  #define DMA_ZONE(xx) xx##_DMA,
>  #else

Is there a known configuraion which triggers this, or was this from
inspection?