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[67.164.59.41]) by smtp.googlemail.com with ESMTPSA id 98e67ed59e1d1-313b2137b77sm161367a91.34.2025.06.10.17.13.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Jun 2025 17:13:23 -0700 (PDT) From: "Vishal Moola (Oracle)" To: Geert Uytterhoeven Cc: linux-m68k@lists.linux-m68k.org, linux-kernel@vger.kernel.org, Andrew Morton , "Vishal Moola (Oracle)" Subject: [PATCH 1/4] m68k: mm: Convert get_pointer_table() to use ptdescs Date: Tue, 10 Jun 2025 17:12:52 -0700 Message-ID: <20250611001255.527952-2-vishal.moola@gmail.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250611001255.527952-1-vishal.moola@gmail.com> References: <20250611001255.527952-1-vishal.moola@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" Motorola uses get_pointer_table() for page tables, so it should be using struct ptdesc, not struct page. This helps us prepare to allocate ptdescs as their own memory descriptor, and prepares to remove a user of page->lru. Signed-off-by: Vishal Moola (Oracle) Reviewed-by: Geert Uytterhoeven --- arch/m68k/mm/motorola.c | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-) diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c index 745bd575dcfa..35c3571ffbef 100644 --- a/arch/m68k/mm/motorola.c +++ b/arch/m68k/mm/motorola.c @@ -148,16 +148,18 @@ void *get_pointer_table(struct mm_struct *mm, int typ= e) =20 /* * For a pointer table for a user process address space, a - * table is taken from a page allocated for the purpose. Each - * page can hold 8 pointer tables. The page is remapped in + * table is taken from a ptdesc allocated for the purpose. Each + * ptdesc can hold 8 pointer tables. The ptdesc is remapped in * virtual address space to be noncacheable. */ if (mask =3D=3D 0) { - void *page; + struct ptdesc *ptdesc =3D pagetable_alloc(GFP_KERNEL | __GFP_ZERO, 0); + void *pt_addr; ptable_desc *new; =20 - if (!(page =3D (void *)get_zeroed_page(GFP_KERNEL))) + if (!ptdesc) return NULL; + pt_addr =3D ptdesc_address(ptdesc); =20 switch (type) { case TABLE_PTE: @@ -165,23 +167,23 @@ void *get_pointer_table(struct mm_struct *mm, int typ= e) * m68k doesn't have SPLIT_PTE_PTLOCKS for not having * SMP. */ - pagetable_pte_ctor(mm, virt_to_ptdesc(page)); + pagetable_pte_ctor(mm, ptdesc); break; case TABLE_PMD: - pagetable_pmd_ctor(mm, virt_to_ptdesc(page)); + pagetable_pmd_ctor(mm, ptdesc); break; case TABLE_PGD: - pagetable_pgd_ctor(virt_to_ptdesc(page)); + pagetable_pgd_ctor(ptdesc); break; } =20 - mmu_page_ctor(page); + mmu_page_ctor(pt_addr); =20 - new =3D PD_PTABLE(page); + new =3D PD_PTABLE(pt_addr); PD_MARKBITS(new) =3D ptable_mask(type) - 1; list_add_tail(new, dp); =20 - return (pmd_t *)page; + return (pmd_t *)pt_addr; } =20 for (tmp =3D 1, off =3D 0; (mask & tmp) =3D=3D 0; tmp <<=3D 1, off +=3D p= table_size(type)) @@ -191,7 +193,7 @@ void *get_pointer_table(struct mm_struct *mm, int type) /* move to end of list */ list_move_tail(dp, &ptable_list[type]); } - return page_address(PD_PAGE(dp)) + off; + return ptdesc_address(PD_PTDESC(dp)) + off; } =20 int free_pointer_table(void *table, int type) --=20 2.49.0