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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Nicholas Piggin , Christophe Leroy , Ackerley Tng , Frank van der Linden , aneesh.kumar@linux.ibm.com, joao.m.martins@oracle.com, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 12/69] mm/hugetlb_cma: Validate hugetlb CMA range by zone at reserve time Message-ID: References: <20260513130542.35604-1-songmuchun@bytedance.com> <20260513130542.35604-13-songmuchun@bytedance.com> 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: <20260513130542.35604-13-songmuchun@bytedance.com> On Wed, May 13, 2026 at 09:04:40PM +0800, Muchun Song wrote: > Hugetlb CMA allocation currently has to cope with CMA areas that span > multiple zones. > > Validate the reserved CMA range up front in hugetlb_cma_reserve() so > later hugetlb CMA allocations can assume a zone-consistent area. > > Also drop the pfn_valid() check from cma_validate_zones(). mem_section > is not fully initialized at this point, so the check can trigger false > warnings. Keep the sanity check in cma_activate_area() instead. > > Acked-by: Mike Rapoport (Microsoft) > Signed-off-by: Muchun Song Reviewed-by: Oscar Salvador (SUSE) -- Oscar Salvador SUSE Labs