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Wed, 19 Feb 2025 05:05:17 +0000 From: Alistair Popple To: akpm@linux-foundation.org, linux-mm@kvack.org Cc: Alistair Popple , gerald.schaefer@linux.ibm.com, dan.j.williams@intel.com, jgg@ziepe.ca, willy@infradead.org, david@redhat.com, linux-kernel@vger.kernel.org, nvdimm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org, jhubbard@nvidia.com, hch@lst.de, zhang.lyra@gmail.com, debug@rivosinc.com, bjorn@kernel.org, balbirs@nvidia.com Subject: [PATCH RFC v2 01/12] mm: Remove PFN_MAP, PFN_SG_CHAIN and PFN_SG_LAST Date: Wed, 19 Feb 2025 16:04:45 +1100 Message-ID: <5b91f54d5e608e0ba4555e6d107a58a9d7f7e2ad.1739941374.git-series.apopple@nvidia.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: References: X-ClientProxiedBy: SY5P282CA0110.AUSP282.PROD.OUTLOOK.COM (2603:10c6:10:20b::15) To DS0PR12MB7726.namprd12.prod.outlook.com (2603:10b6:8:130::6) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR12MB7726:EE_|SJ2PR12MB8875:EE_ X-MS-Office365-Filtering-Correlation-Id: 959f831e-1f39-4119-92ca-08dd50a30079 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|376014|366016; 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The PFN_SG_CHAIN and PFN_SG_LAST flags never appear to have been used so also remove them. Signed-off-by: Alistair Popple Reviewed-by: Christoph Hellwig --- include/linux/pfn_t.h | 31 +++---------------------------- mm/memory.c | 2 -- tools/testing/nvdimm/test/iomap.c | 4 ---- 3 files changed, 3 insertions(+), 34 deletions(-) diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h index 2d91482..46afa12 100644 --- a/include/linux/pfn_t.h +++ b/include/linux/pfn_t.h @@ -5,26 +5,13 @@ /* * PFN_FLAGS_MASK - mask of all the possible valid pfn_t flags - * PFN_SG_CHAIN - pfn is a pointer to the next scatterlist entry - * PFN_SG_LAST - pfn references a page and is the last scatterlist entry * PFN_DEV - pfn is not covered by system memmap by default - * PFN_MAP - pfn has a dynamic page mapping established by a device driver - * PFN_SPECIAL - for CONFIG_FS_DAX_LIMITED builds to allow XIP, but not - * get_user_pages */ #define PFN_FLAGS_MASK (((u64) (~PAGE_MASK)) << (BITS_PER_LONG_LONG - PAGE_SHIFT)) -#define PFN_SG_CHAIN (1ULL << (BITS_PER_LONG_LONG - 1)) -#define PFN_SG_LAST (1ULL << (BITS_PER_LONG_LONG - 2)) #define PFN_DEV (1ULL << (BITS_PER_LONG_LONG - 3)) -#define PFN_MAP (1ULL << (BITS_PER_LONG_LONG - 4)) -#define PFN_SPECIAL (1ULL << (BITS_PER_LONG_LONG - 5)) #define PFN_FLAGS_TRACE \ - { PFN_SPECIAL, "SPECIAL" }, \ - { PFN_SG_CHAIN, "SG_CHAIN" }, \ - { PFN_SG_LAST, "SG_LAST" }, \ - { PFN_DEV, "DEV" }, \ - { PFN_MAP, "MAP" } + { PFN_DEV, "DEV" } static inline pfn_t __pfn_to_pfn_t(unsigned long pfn, u64 flags) { @@ -46,7 +33,7 @@ static inline pfn_t phys_to_pfn_t(phys_addr_t addr, u64 flags) static inline bool pfn_t_has_page(pfn_t pfn) { - return (pfn.val & PFN_MAP) == PFN_MAP || (pfn.val & PFN_DEV) == 0; + return (pfn.val & PFN_DEV) == 0; } static inline unsigned long pfn_t_to_pfn(pfn_t pfn) @@ -100,7 +87,7 @@ static inline pud_t pfn_t_pud(pfn_t pfn, pgprot_t pgprot) #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP static inline bool pfn_t_devmap(pfn_t pfn) { - const u64 flags = PFN_DEV|PFN_MAP; + const u64 flags = PFN_DEV; return (pfn.val & flags) == flags; } @@ -116,16 +103,4 @@ pmd_t pmd_mkdevmap(pmd_t pmd); pud_t pud_mkdevmap(pud_t pud); #endif #endif /* CONFIG_ARCH_HAS_PTE_DEVMAP */ - -#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL -static inline bool pfn_t_special(pfn_t pfn) -{ - return (pfn.val & PFN_SPECIAL) == PFN_SPECIAL; -} -#else -static inline bool pfn_t_special(pfn_t pfn) -{ - return false; -} -#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */ #endif /* _LINUX_PFN_T_H_ */ diff --git a/mm/memory.c b/mm/memory.c index 1e4424a..bdc8dce 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2570,8 +2570,6 @@ static bool vm_mixed_ok(struct vm_area_struct *vma, pfn_t pfn, bool mkwrite) return true; if (pfn_t_devmap(pfn)) return true; - if (pfn_t_special(pfn)) - return true; if (is_zero_pfn(pfn_t_to_pfn(pfn))) return true; return false; diff --git a/tools/testing/nvdimm/test/iomap.c b/tools/testing/nvdimm/test/iomap.c index e431372..ddceb04 100644 --- a/tools/testing/nvdimm/test/iomap.c +++ b/tools/testing/nvdimm/test/iomap.c @@ -137,10 +137,6 @@ EXPORT_SYMBOL_GPL(__wrap_devm_memremap_pages); pfn_t __wrap_phys_to_pfn_t(phys_addr_t addr, unsigned long flags) { - struct nfit_test_resource *nfit_res = get_nfit_res(addr); - - if (nfit_res) - flags &= ~PFN_MAP; return phys_to_pfn_t(addr, flags); } EXPORT_SYMBOL(__wrap_phys_to_pfn_t);