[PATCH 01/12] mm: Remove PFN_MAP, PFN_SG_CHAIN and PFN_SG_LAST
From: Alistair Popple <apopple@nvidia.com>
Date: 2025-05-29 06:32:28
Also in:
dri-devel, linux-arm-kernel, linux-cxl, linux-ext4, linux-fsdevel, linux-mm, linux-riscv, linux-xfs, lkml, loongarch, nvdimm
Subsystem:
libnvdimm: non-volatile memory device subsystem, memory management, memory management - core, the rest · Maintainers:
Dan Williams, Vishal Verma, Dave Jiang, Alison Schofield, Andrew Morton, David Hildenbrand, Linus Torvalds
The PFN_MAP flag is no longer used for anything, so remove it. The PFN_SG_CHAIN and PFN_SG_LAST flags never appear to have been used so also remove them. Signed-off-by: Alistair Popple <apopple@nvidia.com> Reviewed-by: Christoph Hellwig <hch@lst.de> --- 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 4919941..cc85f81 100644
--- a/mm/memory.c
+++ b/mm/memory.c@@ -2569,8 +2569,6 @@ 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);
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