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Miller" , Andreas Larsson , Andrew Morton , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: Re: [PATCH 6/8] mm/bootmem_info: stop marking mem_section_usage as MIX_SECTION_INFO Message-ID: References: <20260511-bootmem_info_prep-v1-0-3fb0be6fc688@kernel.org> <20260511-bootmem_info_prep-v1-6-3fb0be6fc688@kernel.org> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260511-bootmem_info_prep-v1-6-3fb0be6fc688@kernel.org> On Mon, May 11, 2026 at 04:05:34PM +0200, David Hildenbrand (Arm) wrote: > We never free the ms->usage data for boot memory sections (see > section_deactivate()). And to identify whether ms->usage was allocated > from memblock, we simply identify it by looking at PG_reserved. > > Consequently, there is no need to mark ms->usage as MIX_SECTION_INFO. > Let's just stop doing that. > > Signed-off-by: David Hildenbrand (Arm) Reviewed-by: Mike Rapoport (Microsoft) > --- > mm/bootmem_info.c | 12 +----------- > 1 file changed, 1 insertion(+), 11 deletions(-) > > diff --git a/mm/bootmem_info.c b/mm/bootmem_info.c > index cce1d560f094..0fa78db7fbc0 100644 > --- a/mm/bootmem_info.c > +++ b/mm/bootmem_info.c > @@ -38,10 +38,8 @@ void put_page_bootmem(struct page *page) > > static void __init register_page_bootmem_info_section(unsigned long start_pfn) > { > - unsigned long mapsize, section_nr, i; > + unsigned long section_nr; > struct mem_section *ms; > - struct mem_section_usage *usage; > - struct page *page; > > start_pfn = SECTION_ALIGN_DOWN(start_pfn); > section_nr = pfn_to_section_nr(start_pfn); > @@ -50,14 +48,6 @@ static void __init register_page_bootmem_info_section(unsigned long start_pfn) > if (!preinited_vmemmap_section(ms)) > register_page_bootmem_memmap(section_nr, pfn_to_page(start_pfn), > PAGES_PER_SECTION); > - > - usage = ms->usage; > - page = virt_to_page(usage); > - > - mapsize = PAGE_ALIGN(mem_section_usage_size()) >> PAGE_SHIFT; > - > - for (i = 0; i < mapsize; i++, page++) > - get_page_bootmem(section_nr, page, MIX_SECTION_INFO); > } > > void __init register_page_bootmem_info_node(struct pglist_data *pgdat) > > -- > 2.43.0 > -- Sincerely yours, Mike.