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mm: remove remaining is_swap_pmd() users and is_swap_pmd()

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Update copy_huge_pmd() and change_huge_pmd() to use
pmd_is_valid_softleaf() - as this checks for the only valid non-present
huge PMD states.

Also update mm/debug_vm_pgtable.c to explicitly test for a valid leaf PMD
entry (which it was not before, which was incorrect), and have it test
against pmd_is_huge() and pmd_is_valid_softleaf() rather than
is_swap_pmd().

With these changes done there are no further users of is_swap_pmd(), so
remove it.

Link: https://lkml.kernel.org/r/1628b00b00c8498bbd2c20b82117ee87845fb738.1762812360.git.lorenzo.stoakes@oracle.com
Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Byungchul Park <byungchul@sk.com>
Cc: Chengming Zhou <chengming.zhou@linux.dev>
Cc: Chris Li <chrisl@kernel.org>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Gregory Price <gourry@gourry.net>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: "Huang, Ying" <ying.huang@linux.alibaba.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Jann Horn <jannh@google.com>
Cc: Janosch Frank <frankja@linux.ibm.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Joshua Hahn <joshua.hahnjy@gmail.com>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Mathew Brost <matthew.brost@intel.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Nico Pache <npache@redhat.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Rakie Kim <rakie.kim@sk.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Wei Xu <weixugc@google.com>
Cc: xu xin <xu.xin16@zte.com.cn>
Cc: Yuanchu Xie <yuanchu@google.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Lorenzo Stoakes
2025-11-10 22:21:30 +00:00
committed by Andrew Morton
parent 15eabc898d
commit c0a80c2ce6
3 changed files with 18 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
include/linux/huge_mm.h
View File

@@ -486,11 +486,6 @@ void vma_adjust_trans_huge(struct vm_area_struct *vma, unsigned long start,
spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma);
spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma);
static inline int is_swap_pmd(pmd_t pmd)
{
return !pmd_none(pmd) && !pmd_present(pmd);
}
/* mmap_lock must be held on entry */
static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
struct vm_area_struct *vma)
@@ -692,10 +687,6 @@ static inline void vma_adjust_trans_huge(struct vm_area_struct *vma,
struct vm_area_struct *next)
{
}
static inline int is_swap_pmd(pmd_t pmd)
{
return 0;
}
static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
struct vm_area_struct *vma)
{

25
mm/debug_vm_pgtable.c
View File

@@ -74,6 +74,7 @@ struct pgtable_debug_args {
unsigned long fixed_pte_pfn;
swp_entry_t swp_entry;
swp_entry_t leaf_entry;
};
static void __init pte_basic_tests(struct pgtable_debug_args *args, int idx)
@@ -745,7 +746,7 @@ static void __init pmd_soft_dirty_tests(struct pgtable_debug_args *args)
WARN_ON(pmd_soft_dirty(pmd_clear_soft_dirty(pmd)));
}
static void __init pmd_swap_soft_dirty_tests(struct pgtable_debug_args *args)
static void __init pmd_leaf_soft_dirty_tests(struct pgtable_debug_args *args)
{
pmd_t pmd;
@@ -757,15 +758,16 @@ static void __init pmd_swap_soft_dirty_tests(struct pgtable_debug_args *args)
return;
pr_debug("Validating PMD swap soft dirty\n");
pmd = swp_entry_to_pmd(args->swp_entry);
WARN_ON(!is_swap_pmd(pmd));
pmd = swp_entry_to_pmd(args->leaf_entry);
WARN_ON(!pmd_is_huge(pmd));
WARN_ON(!pmd_is_valid_softleaf(pmd));
WARN_ON(!pmd_swp_soft_dirty(pmd_swp_mksoft_dirty(pmd)));
WARN_ON(pmd_swp_soft_dirty(pmd_swp_clear_soft_dirty(pmd)));
}
#else /* !CONFIG_TRANSPARENT_HUGEPAGE */
static void __init pmd_soft_dirty_tests(struct pgtable_debug_args *args) { }
static void __init pmd_swap_soft_dirty_tests(struct pgtable_debug_args *args) { }
static void __init pmd_leaf_soft_dirty_tests(struct pgtable_debug_args *args) { }
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
static void __init pte_swap_exclusive_tests(struct pgtable_debug_args *args)
@@ -818,7 +820,7 @@ static void __init pte_swap_tests(struct pgtable_debug_args *args)
}
#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
static void __init pmd_swap_tests(struct pgtable_debug_args *args)
static void __init pmd_softleaf_tests(struct pgtable_debug_args *args)
{
swp_entry_t arch_entry;
pmd_t pmd1, pmd2;
@@ -827,15 +829,16 @@ static void __init pmd_swap_tests(struct pgtable_debug_args *args)
return;
pr_debug("Validating PMD swap\n");
pmd1 = swp_entry_to_pmd(args->swp_entry);
WARN_ON(!is_swap_pmd(pmd1));
pmd1 = swp_entry_to_pmd(args->leaf_entry);
WARN_ON(!pmd_is_huge(pmd1));
WARN_ON(!pmd_is_valid_softleaf(pmd1));
arch_entry = __pmd_to_swp_entry(pmd1);
pmd2 = __swp_entry_to_pmd(arch_entry);
WARN_ON(memcmp(&pmd1, &pmd2, sizeof(pmd1)));
}
#else /* !CONFIG_ARCH_ENABLE_THP_MIGRATION */
static void __init pmd_swap_tests(struct pgtable_debug_args *args) { }
static void __init pmd_softleaf_tests(struct pgtable_debug_args *args) { }
#endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */
static void __init swap_migration_tests(struct pgtable_debug_args *args)
@@ -1229,6 +1232,8 @@ static int __init init_args(struct pgtable_debug_args *args)
max_swap_offset = swp_offset(pte_to_swp_entry(swp_entry_to_pte(swp_entry(0, ~0UL))));
/* Create a swp entry with all possible bits set while still being swap. */
args->swp_entry = swp_entry(MAX_SWAPFILES - 1, max_swap_offset);
/* Create a non-present migration entry. */
args->leaf_entry = make_writable_migration_entry(~0UL);
/*
* Allocate (huge) pages because some of the tests need to access
@@ -1318,12 +1323,12 @@ static int __init debug_vm_pgtable(void)
pte_soft_dirty_tests(&args);
pmd_soft_dirty_tests(&args);
pte_swap_soft_dirty_tests(&args);
pmd_swap_soft_dirty_tests(&args);
pmd_leaf_soft_dirty_tests(&args);
pte_swap_exclusive_tests(&args);
pte_swap_tests(&args);
pmd_swap_tests(&args);
pmd_softleaf_tests(&args);
swap_migration_tests(&args);

5
mm/huge_memory.c
View File

@@ -1800,7 +1800,8 @@ int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
ret = -EAGAIN;
pmd = *src_pmd;
if (unlikely(thp_migration_supported() && is_swap_pmd(pmd))) {
if (unlikely(thp_migration_supported() &&
pmd_is_valid_softleaf(pmd))) {
copy_huge_non_present_pmd(dst_mm, src_mm, dst_pmd, src_pmd, addr,
dst_vma, src_vma, pmd, pgtable);
ret = 0;
@@ -2487,7 +2488,7 @@ int change_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
if (!ptl)
return 0;
if (thp_migration_supported() && is_swap_pmd(*pmd)) {
if (thp_migration_supported() && pmd_is_valid_softleaf(*pmd)) {
change_non_present_huge_pmd(mm, addr, pmd, uffd_wp,
uffd_wp_resolve);
goto unlock;