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Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko Subject: Re: [PATCH 07/14] mm/bootmem_info: avoid using sparse_decode_mem_map() Message-ID: References: <20260317165652.99114-1-david@kernel.org> <20260317165652.99114-8-david@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260317165652.99114-8-david@kernel.org> X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 154A3100018 X-Stat-Signature: y8o66g1gikrricgc4eyupbihc7c7zpzj X-HE-Tag: 1773822021-6084 X-HE-Meta: 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 Vq1h73iq igEb6brKllsn++e1MmBsIssBgMLVmZPBI7eXrsVq+wJfs5RGOqvOtEi3R/Xdn0SjdWsr1in0JogKZk7V07atFtW2u6BVXyvYCIqmYQ7k5l1B6AmFEBFzowlJqhJlOo0d3rkpPGxwQuQh36cnXxVCHL7lg+P3+WSgU8UMOrggI+cDWtoxSGF7mP5OXNsuwY57+4zRWReEYLEw/DhCuftjwphVf0TfngkKsuwBVTLAXKBFIXC748eKSc32+Og5ZDx/AqmzMd84EHZhDFTJoZ/NdRbmWaQjmRi/YXgPdiEW+5VMyXKD3oSLnZsBaw3rV+sUJsCCp9YdeP52Bo5w= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Mar 17, 2026 at 05:56:45PM +0100, David Hildenbrand (Arm) wrote: > With SPARSEMEM_VMEMMAP, we can just do a pfn_to_page(). It is not super > clear whether the start_pfn is properly aligned ... so let's just make > sure it is. > > We will soon might try to remove the bootmem info completely, for now, > just keep it working as is. > > Signed-off-by: David Hildenbrand (Arm) Reviewed-by: Mike Rapoport (Microsoft) > --- > mm/bootmem_info.c | 9 ++++----- > 1 file changed, 4 insertions(+), 5 deletions(-) > > diff --git a/mm/bootmem_info.c b/mm/bootmem_info.c > index e61e08e24924..3d7675a3ae04 100644 > --- a/mm/bootmem_info.c > +++ b/mm/bootmem_info.c > @@ -44,17 +44,16 @@ static void __init register_page_bootmem_info_section(unsigned long start_pfn) > { > unsigned long mapsize, section_nr, i; > struct mem_section *ms; > - struct page *page, *memmap; > struct mem_section_usage *usage; > + struct page *page; > > + start_pfn = SECTION_ALIGN_DOWN(start_pfn); > section_nr = pfn_to_section_nr(start_pfn); > ms = __nr_to_section(section_nr); > > - memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); > - > if (!preinited_vmemmap_section(ms)) > - register_page_bootmem_memmap(section_nr, memmap, > - PAGES_PER_SECTION); > + register_page_bootmem_memmap(section_nr, pfn_to_page(start_pfn), > + PAGES_PER_SECTION); > > usage = ms->usage; > page = virt_to_page(usage); > -- > 2.43.0 > -- Sincerely yours, Mike.