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Mon, 12 Jun 2023 14:04:54 -0700 (PDT) Received: from unknowna0e70b2ca394.attlocal.net ([2600:1700:2f7d:1800::16]) by smtp.googlemail.com with ESMTPSA id s125-20020a817783000000b00569eb609458sm2757115ywc.81.2023.06.12.14.04.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 Jun 2023 14:04:54 -0700 (PDT) From: "Vishal Moola (Oracle)" To: Andrew Morton , Matthew Wilcox Cc: linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-openrisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, Hugh Dickins , "Vishal Moola (Oracle)" Subject: [PATCH v4 04/34] pgtable: Create struct ptdesc Date: Mon, 12 Jun 2023 14:03:53 -0700 Message-Id: <20230612210423.18611-5-vishal.moola@gmail.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230612210423.18611-1-vishal.moola@gmail.com> References: <20230612210423.18611-1-vishal.moola@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 38E544001E X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: h7kcwfi5iwwdaxc6wbkdqa135hz8gwwz X-HE-Tag: 1686603895-558543 X-HE-Meta: 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 JyFC62o2 3uvDJO+JheRDPyWDQPE+pyUXuC2LxKprvrwiY7GipOsILF6T8QXJzNyolu9v6hbWbjrEb6t1KRee/ZnARsuGGZGfE4E/985SIPghmb2iMU8a7DCYsZ6P+DdJvxnjooGWz3arcKU9NQDt8DzD5rZwgY8CdGi/WgcfMG3FbPqPKG+MWpkFP0unZeDgV7Zz8tek1xj6MuLkVVrPABsex4pJnKleqR4Qkex0HVt62Sc8gzWwscdNduKK+8d6rQUczO3/5UMxxb9umn7GWlnb8FEWIMIp25ez8lCVZQOWo01Y/eqyLH9d+wISOWNNV1YbmMHs1bl7o9sDU4zwMZKi0u/tI3jf1UV/7/GqMpipLsWpOoRat2G6/GpLF4docIn/Tue0QLzWO+4x8z/dmGDc5QcAyR5rw5OvOllvLux64kY5X3mQtudptc8JcD/vKF/f/9g3ftFQy8tMznhr8Q7Jq0KyGs5AHqXks80J0xJGP9YCBVzEHzm6ZF/1oHRO/r6Km8v1krozKsnwHjbpno/w6n3EyTqkGdg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Currently, page table information is stored within struct page. As part of simplifying struct page, create struct ptdesc for page table information. Signed-off-by: Vishal Moola (Oracle) --- include/linux/pgtable.h | 51 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index c5a51481bbb9..330de96ebfd6 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -975,6 +975,57 @@ static inline void ptep_modify_prot_commit(struct vm_area_struct *vma, #endif /* __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION */ #endif /* CONFIG_MMU */ + +/** + * struct ptdesc - Memory descriptor for page tables. + * @__page_flags: Same as page flags. Unused for page tables. + * @pt_list: List of used page tables. Used for s390 and x86. + * @_pt_pad_1: Padding that aliases with page's compound head. + * @pmd_huge_pte: Protected by ptdesc->ptl, used for THPs. + * @_pt_s390_gaddr: Aliases with page's mapping. Used for s390 gmap only. + * @pt_mm: Used for x86 pgds. + * @pt_frag_refcount: For fragmented page table tracking. Powerpc and s390 only. + * @ptl: Lock for the page table. + * + * This struct overlays struct page for now. Do not modify without a good + * understanding of the issues. + */ +struct ptdesc { + unsigned long __page_flags; + + union { + struct list_head pt_list; + struct { + unsigned long _pt_pad_1; + pgtable_t pmd_huge_pte; + }; + }; + unsigned long _pt_s390_gaddr; + + union { + struct mm_struct *pt_mm; + atomic_t pt_frag_refcount; + }; + +#if ALLOC_SPLIT_PTLOCKS + spinlock_t *ptl; +#else + spinlock_t ptl; +#endif +}; + +#define TABLE_MATCH(pg, pt) \ + static_assert(offsetof(struct page, pg) == offsetof(struct ptdesc, pt)) +TABLE_MATCH(flags, __page_flags); +TABLE_MATCH(compound_head, pt_list); +TABLE_MATCH(compound_head, _pt_pad_1); +TABLE_MATCH(pmd_huge_pte, pmd_huge_pte); +TABLE_MATCH(mapping, _pt_s390_gaddr); +TABLE_MATCH(pt_mm, pt_mm); +TABLE_MATCH(ptl, ptl); +#undef TABLE_MATCH +static_assert(sizeof(struct ptdesc) <= sizeof(struct page)); + /* * No-op macros that just return the current protection value. Defined here * because these macros can be used even if CONFIG_MMU is not defined. -- 2.40.1