The patch titled
Subject: Revert "riscv: mm: add support for ZONE_DEVICE"
has been added to the -mm mm-unstable branch. Its filename is
revert-riscv-mm-add-support-for-zone_device.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/revert-riscv-mm-add-support-for-zone_device.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Alistair Popple <apopple@xxxxxxxxxx>
Subject: Revert "riscv: mm: add support for ZONE_DEVICE"
Date: Tue, 7 Jan 2025 14:42:41 +1100
DEVMAP PTEs are no longer required to support ZONE_DEVICE so remove them.
Link: https://lkml.kernel.org/r/dd557b20d49a08f6172e6cff76753850300fda57.1736221254.git-series.apopple@xxxxxxxxxx
Signed-off-by: Alistair Popple <apopple@xxxxxxxxxx>
Suggested-by: Chunyan Zhang <zhang.lyra@xxxxxxxxx>
Reviewed-by: Björn Töpel <bjorn@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/riscv/Kconfig | 1 -
arch/riscv/include/asm/pgtable-64.h | 20 --------------------
arch/riscv/include/asm/pgtable-bits.h | 1 -
arch/riscv/include/asm/pgtable.h | 17 -----------------
4 files changed, 39 deletions(-)
--- a/arch/riscv/include/asm/pgtable-64.h~revert-riscv-mm-add-support-for-zone_device
+++ a/arch/riscv/include/asm/pgtable-64.h
@@ -398,24 +398,4 @@ static inline struct page *pgd_page(pgd_
#define p4d_offset p4d_offset
p4d_t *p4d_offset(pgd_t *pgd, unsigned long address);
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-static inline int pte_devmap(pte_t pte);
-static inline pte_t pmd_pte(pmd_t pmd);
-
-static inline int pmd_devmap(pmd_t pmd)
-{
- return pte_devmap(pmd_pte(pmd));
-}
-
-static inline int pud_devmap(pud_t pud)
-{
- return 0;
-}
-
-static inline int pgd_devmap(pgd_t pgd)
-{
- return 0;
-}
-#endif
-
#endif /* _ASM_RISCV_PGTABLE_64_H */
--- a/arch/riscv/include/asm/pgtable-bits.h~revert-riscv-mm-add-support-for-zone_device
+++ a/arch/riscv/include/asm/pgtable-bits.h
@@ -19,7 +19,6 @@
#define _PAGE_SOFT (3 << 8) /* Reserved for software */
#define _PAGE_SPECIAL (1 << 8) /* RSW: 0x1 */
-#define _PAGE_DEVMAP (1 << 9) /* RSW, devmap */
#define _PAGE_TABLE _PAGE_PRESENT
/*
--- a/arch/riscv/include/asm/pgtable.h~revert-riscv-mm-add-support-for-zone_device
+++ a/arch/riscv/include/asm/pgtable.h
@@ -399,13 +399,6 @@ static inline int pte_special(pte_t pte)
return pte_val(pte) & _PAGE_SPECIAL;
}
-#ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
-static inline int pte_devmap(pte_t pte)
-{
- return pte_val(pte) & _PAGE_DEVMAP;
-}
-#endif
-
/* static inline pte_t pte_rdprotect(pte_t pte) */
static inline pte_t pte_wrprotect(pte_t pte)
@@ -447,11 +440,6 @@ static inline pte_t pte_mkspecial(pte_t
return __pte(pte_val(pte) | _PAGE_SPECIAL);
}
-static inline pte_t pte_mkdevmap(pte_t pte)
-{
- return __pte(pte_val(pte) | _PAGE_DEVMAP);
-}
-
static inline pte_t pte_mkhuge(pte_t pte)
{
return pte;
@@ -763,11 +751,6 @@ static inline pmd_t pmd_mkdirty(pmd_t pm
return pte_pmd(pte_mkdirty(pmd_pte(pmd)));
}
-static inline pmd_t pmd_mkdevmap(pmd_t pmd)
-{
- return pte_pmd(pte_mkdevmap(pmd_pte(pmd)));
-}
-
static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp, pmd_t pmd)
{
--- a/arch/riscv/Kconfig~revert-riscv-mm-add-support-for-zone_device
+++ a/arch/riscv/Kconfig
@@ -42,7 +42,6 @@ config RISCV
select ARCH_HAS_PMEM_API
select ARCH_HAS_PREEMPT_LAZY
select ARCH_HAS_PREPARE_SYNC_CORE_CMD
- select ARCH_HAS_PTE_DEVMAP if 64BIT && MMU
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_SET_DIRECT_MAP if MMU
select ARCH_HAS_SET_MEMORY if MMU
_
Patches currently in -mm which might be from apopple@xxxxxxxxxx are
fuse-fix-dax-truncate-punch_hole-fault-path.patch
fs-dax-return-unmapped-busy-pages-from-dax_layout_busy_page_range.patch
fs-dax-dont-skip-locked-entries-when-scanning-entries.patch
fs-dax-refactor-wait-for-dax-idle-page.patch
fs-dax-create-a-common-implementation-to-break-dax-layouts.patch
fs-dax-always-remove-dax-page-cache-entries-when-breaking-layouts.patch
fs-dax-ensure-all-pages-are-idle-prior-to-filesystem-unmount.patch
fs-dax-remove-page_mapping_dax_shared-mapping-flag.patch
mm-gup-remove-redundant-check-for-pci-p2pdma-page.patch
mm-mm_init-move-p2pdma-page-refcount-initialisation-to-p2pdma.patch
mm-allow-compound-zone-device-pages.patch
mm-memory-enhance-insert_page_into_pte_locked-to-create-writable-mappings.patch
mm-memory-add-vmf_insert_page_mkwrite.patch
rmap-add-support-for-pud-sized-mappings-to-rmap.patch
huge_memory-add-vmf_insert_folio_pud.patch
huge_memory-add-vmf_insert_folio_pmd.patch
memremap-add-is_devdax_page-and-is_fsdax_page-helpers.patch
mm-gup-dont-allow-foll_longterm-pinning-of-fs-dax-pages.patch
proc-task_mmu-mark-devdax-and-fsdax-pages-as-always-unpinned.patch
mm-mlock-skip-zone_device-pmds-during-mlock.patch
fs-dax-properly-refcount-fs-dax-pages.patch
device-dax-properly-refcount-device-dax-pages-when-mapping.patch
mm-remove-pxx_devmap-callers.patch
mm-remove-devmap-related-functions-and-page-table-bits.patch
revert-riscv-mm-add-support-for-zone_device.patch
