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Subject: Re: [PATCH 02/10] mm: provide free_reserved_pages(), removing x86
 variant
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From: Muchun Song <muchun.song@linux.dev>
In-Reply-To: <20260708-bootmem_info_part2-v1-2-156ce4986598@kernel.org>
Date: Thu, 9 Jul 2026 14:19:22 +0800
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
 Andy Lutomirski <luto@kernel.org>,
 Peter Zijlstra <peterz@infradead.org>,
 Thomas Gleixner <tglx@kernel.org>,
 Ingo Molnar <mingo@redhat.com>,
 Borislav Petkov <bp@alien8.de>,
 x86@kernel.org,
 "H. Peter Anvin" <hpa@zytor.com>,
 Andrew Morton <akpm@linux-foundation.org>,
 Lorenzo Stoakes <ljs@kernel.org>,
 "Liam R. Howlett" <liam@infradead.org>,
 Vlastimil Babka <vbabka@kernel.org>,
 Mike Rapoport <rppt@kernel.org>,
 Suren Baghdasaryan <surenb@google.com>,
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 Johannes Weiner <hannes@cmpxchg.org>,
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References: <20260708-bootmem_info_part2-v1-0-156ce4986598@kernel.org>
 <20260708-bootmem_info_part2-v1-2-156ce4986598@kernel.org>
To: "David Hildenbrand (Arm)" <david@kernel.org>
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> On Jul 8, 2026, at 22:10, David Hildenbrand (Arm) <david@kernel.org> wrote:
> 
> Let's extend free_reserved_page() in page_alloc.c to free_reserved_pages(),
> dropping the custom x86 variant. The common-code variant will consume an
> order, so adjust the x86 callers accordingly.
> 
> Make free_reserved_pages() assume that we are freeing ordinary
> high-order pages, just with the special "reserved" flavor. The target
> use case for now is freeing vmemmap PMD pages.
> 
> Set the refcount directly to 0 (instead of 1) and call
> __free_frozen_pages(). Add some kerneldoc. Use a single
> adjust_managed_page_count() call.
> 
> Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>

Reviewed-by: Muchun Song <muchun.song@linux.dev>

Thanks.