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Fri, 19 Dec 2025 03:58:35 -0800 (PST) From: chengkaitao To: davem@davemloft.net, andreas@gaisler.com, akpm@linux-foundation.org, david@kernel.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com Cc: kevin.brodsky@arm.com, dave.hansen@linux.intel.com, ziy@nvidia.com, chengkaitao@kylinos.cn, willy@infradead.org, zhengqi.arch@bytedance.com, sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v4 1/3] sparc: Use vmemmap_populate_hugepages for vmemmap_populate Date: Fri, 19 Dec 2025 19:58:10 +0800 Message-ID: <20251219115812.65855-2-pilgrimtao@gmail.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20251219115812.65855-1-pilgrimtao@gmail.com> References: <20251219115812.65855-1-pilgrimtao@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Chengkaitao 1. In the SPARC architecture, reimplemented vmemmap_populate using vmemmap_populate_hugepages. 2. Allow the SPARC arch to fallback to vmemmap_populate_basepages(), when vmemmap_alloc_block returns NULL. Signed-off-by: Chengkaitao Acked-by: Mike Rapoport (Microsoft) --- arch/sparc/mm/init_64.c | 47 ++++++++++++++--------------------------- 1 file changed, 16 insertions(+), 31 deletions(-) diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index df9f7c444c39..858eaa6615ea 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -2581,8 +2581,8 @@ unsigned long _PAGE_CACHE __read_mostly; EXPORT_SYMBOL(_PAGE_CACHE); =20 #ifdef CONFIG_SPARSEMEM_VMEMMAP -int __meminit vmemmap_populate(unsigned long vstart, unsigned long vend, - int node, struct vmem_altmap *altmap) +void __meminit vmemmap_set_pmd(pmd_t *pmd, void *p, int node, + unsigned long addr, unsigned long next) { unsigned long pte_base; =20 @@ -2595,39 +2595,24 @@ int __meminit vmemmap_populate(unsigned long vstart= , unsigned long vend, =20 pte_base |=3D _PAGE_PMD_HUGE; =20 - vstart =3D vstart & PMD_MASK; - vend =3D ALIGN(vend, PMD_SIZE); - for (; vstart < vend; vstart +=3D PMD_SIZE) { - pgd_t *pgd =3D vmemmap_pgd_populate(vstart, node); - unsigned long pte; - p4d_t *p4d; - pud_t *pud; - pmd_t *pmd; - - if (!pgd) - return -ENOMEM; - - p4d =3D vmemmap_p4d_populate(pgd, vstart, node); - if (!p4d) - return -ENOMEM; - - pud =3D vmemmap_pud_populate(p4d, vstart, node); - if (!pud) - return -ENOMEM; + pmd_val(*pmd) =3D pte_base | __pa(p); +} =20 - pmd =3D pmd_offset(pud, vstart); - pte =3D pmd_val(*pmd); - if (!(pte & _PAGE_VALID)) { - void *block =3D vmemmap_alloc_block(PMD_SIZE, node); +int __meminit vmemmap_check_pmd(pmd_t *pmdp, int node, + unsigned long addr, unsigned long next) +{ + int large =3D pmd_leaf(*pmdp); =20 - if (!block) - return -ENOMEM; + if (large) + vmemmap_verify((pte_t *)pmdp, node, addr, next); =20 - pmd_val(*pmd) =3D pte_base | __pa(block); - } - } + return large; +} =20 - return 0; +int __meminit vmemmap_populate(unsigned long vstart, unsigned long vend, + int node, struct vmem_altmap *altmap) +{ + return vmemmap_populate_hugepages(vstart, vend, node, altmap); } #endif /* CONFIG_SPARSEMEM_VMEMMAP */ =20 --=20 2.50.1 (Apple Git-155)