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mm: mass constification of folio/page pointers

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Now that page_pgoff() takes const pointers, we can constify the pointers
to a lot of functions.

Link: https://lkml.kernel.org/r/20241005200121.3231142-5-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2024-10-05 21:01:15 +01:00 committed by Andrew Morton
parent 713da0b33b
commit 68158bfa3d
7 changed files with 37 additions and 30 deletions
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7
include/linux/ksm.h
View File

@ -90,7 +90,7 @@ struct folio *ksm_might_need_to_copy(struct folio *folio,
void rmap_walk_ksm(struct folio *folio, struct rmap_walk_control *rwc); void rmap_walk_ksm(struct folio *folio, struct rmap_walk_control *rwc);
void folio_migrate_ksm(struct folio *newfolio, struct folio *folio); void folio_migrate_ksm(struct folio *newfolio, struct folio *folio);
void collect_procs_ksm(struct folio *folio, struct page *page, void collect_procs_ksm(const struct folio *folio, const struct page *page,
struct list_head *to_kill, int force_early); struct list_head *to_kill, int force_early);
long ksm_process_profit(struct mm_struct *); long ksm_process_profit(struct mm_struct *);
@ -122,8 +122,9 @@ static inline void ksm_might_unmap_zero_page(struct mm_struct *mm, pte_t pte)
{ {
} }
static inline void collect_procs_ksm(struct folio *folio, struct page *page, static inline void collect_procs_ksm(const struct folio *folio,
struct list_head *to_kill, int force_early) const struct page *page, struct list_head *to_kill,
int force_early)
{ {
} }

10
include/linux/rmap.h
View File

@ -171,7 +171,7 @@ static inline void anon_vma_merge(struct vm_area_struct *vma,
unlink_anon_vmas(next); unlink_anon_vmas(next);
} }
struct anon_vma *folio_get_anon_vma(struct folio *folio); struct anon_vma *folio_get_anon_vma(const struct folio *folio);
/* RMAP flags, currently only relevant for some anon rmap operations. */ /* RMAP flags, currently only relevant for some anon rmap operations. */
typedef int __bitwise rmap_t; typedef int __bitwise rmap_t;
@ -194,8 +194,8 @@ enum rmap_level {
RMAP_LEVEL_PMD, RMAP_LEVEL_PMD,
}; };
static inline void __folio_rmap_sanity_checks(struct folio *folio, static inline void __folio_rmap_sanity_checks(const struct folio *folio,
struct page *page, int nr_pages, enum rmap_level level) const struct page *page, int nr_pages, enum rmap_level level)
{ {
/* hugetlb folios are handled separately. */ /* hugetlb folios are handled separately. */
VM_WARN_ON_FOLIO(folio_test_hugetlb(folio), folio); VM_WARN_ON_FOLIO(folio_test_hugetlb(folio), folio);
@ -771,14 +771,14 @@ struct rmap_walk_control {
bool (*rmap_one)(struct folio *folio, struct vm_area_struct *vma, bool (*rmap_one)(struct folio *folio, struct vm_area_struct *vma,
unsigned long addr, void *arg); unsigned long addr, void *arg);
int (*done)(struct folio *folio); int (*done)(struct folio *folio);
struct anon_vma *(*anon_lock)(struct folio *folio, struct anon_vma *(*anon_lock)(const struct folio *folio,
struct rmap_walk_control *rwc); struct rmap_walk_control *rwc);
bool (*invalid_vma)(struct vm_area_struct *vma, void *arg); bool (*invalid_vma)(struct vm_area_struct *vma, void *arg);
}; };
void rmap_walk(struct folio *folio, struct rmap_walk_control *rwc); void rmap_walk(struct folio *folio, struct rmap_walk_control *rwc);
void rmap_walk_locked(struct folio *folio, struct rmap_walk_control *rwc); void rmap_walk_locked(struct folio *folio, struct rmap_walk_control *rwc);
struct anon_vma *folio_lock_anon_vma_read(struct folio *folio, struct anon_vma *folio_lock_anon_vma_read(const struct folio *folio,
struct rmap_walk_control *rwc); struct rmap_walk_control *rwc);
#else /* !CONFIG_MMU */ #else /* !CONFIG_MMU */

5
mm/internal.h
View File

@ -1117,10 +1117,11 @@ void ClearPageHWPoisonTakenOff(struct page *page);
bool take_page_off_buddy(struct page *page); bool take_page_off_buddy(struct page *page);
bool put_page_back_buddy(struct page *page); bool put_page_back_buddy(struct page *page);
struct task_struct *task_early_kill(struct task_struct *tsk, int force_early); struct task_struct *task_early_kill(struct task_struct *tsk, int force_early);
void add_to_kill_ksm(struct task_struct *tsk, struct page *p, void add_to_kill_ksm(struct task_struct *tsk, const struct page *p,
struct vm_area_struct *vma, struct list_head *to_kill, struct vm_area_struct *vma, struct list_head *to_kill,
unsigned long ksm_addr); unsigned long ksm_addr);
unsigned long page_mapped_in_vma(struct page *page, struct vm_area_struct *vma); unsigned long page_mapped_in_vma(const struct page *page,
struct vm_area_struct *vma);
#else #else
static inline void unmap_poisoned_folio(struct folio *folio, enum ttu_flags ttu) static inline void unmap_poisoned_folio(struct folio *folio, enum ttu_flags ttu)

5
mm/ksm.c
View File

@ -1051,7 +1051,8 @@ static int unmerge_ksm_pages(struct vm_area_struct *vma,
return err; return err;
} }
static inline struct ksm_stable_node *folio_stable_node(struct folio *folio) static inline
struct ksm_stable_node *folio_stable_node(const struct folio *folio)
{ {
return folio_test_ksm(folio) ? folio_raw_mapping(folio) : NULL; return folio_test_ksm(folio) ? folio_raw_mapping(folio) : NULL;
} }
@ -3067,7 +3068,7 @@ again:
/* /*
* Collect processes when the error hit an ksm page. * Collect processes when the error hit an ksm page.
*/ */
void collect_procs_ksm(struct folio *folio, struct page *page, void collect_procs_ksm(const struct folio *folio, const struct page *page,
struct list_head *to_kill, int force_early) struct list_head *to_kill, int force_early)
{ {
struct ksm_stable_node *stable_node; struct ksm_stable_node *stable_node;

24
mm/memory-failure.c
View File

@ -445,7 +445,7 @@ static unsigned long dev_pagemap_mapping_shift(struct vm_area_struct *vma,
* Schedule a process for later kill. * Schedule a process for later kill.
* Uses GFP_ATOMIC allocations to avoid potential recursions in the VM. * Uses GFP_ATOMIC allocations to avoid potential recursions in the VM.
*/ */
static void __add_to_kill(struct task_struct *tsk, struct page *p, static void __add_to_kill(struct task_struct *tsk, const struct page *p,
struct vm_area_struct *vma, struct list_head *to_kill, struct vm_area_struct *vma, struct list_head *to_kill,
unsigned long addr) unsigned long addr)
{ {
@ -461,7 +461,7 @@ static void __add_to_kill(struct task_struct *tsk, struct page *p,
if (is_zone_device_page(p)) if (is_zone_device_page(p))
tk->size_shift = dev_pagemap_mapping_shift(vma, tk->addr); tk->size_shift = dev_pagemap_mapping_shift(vma, tk->addr);
else else
tk->size_shift = page_shift(compound_head(p)); tk->size_shift = folio_shift(page_folio(p));
/* /*
* Send SIGKILL if "tk->addr == -EFAULT". Also, as * Send SIGKILL if "tk->addr == -EFAULT". Also, as
@ -486,7 +486,7 @@ static void __add_to_kill(struct task_struct *tsk, struct page *p,
list_add_tail(&tk->nd, to_kill); list_add_tail(&tk->nd, to_kill);
} }
static void add_to_kill_anon_file(struct task_struct *tsk, struct page *p, static void add_to_kill_anon_file(struct task_struct *tsk, const struct page *p,
struct vm_area_struct *vma, struct list_head *to_kill, struct vm_area_struct *vma, struct list_head *to_kill,
unsigned long addr) unsigned long addr)
{ {
@ -509,7 +509,7 @@ static bool task_in_to_kill_list(struct list_head *to_kill,
return false; return false;
} }
void add_to_kill_ksm(struct task_struct *tsk, struct page *p, void add_to_kill_ksm(struct task_struct *tsk, const struct page *p,
struct vm_area_struct *vma, struct list_head *to_kill, struct vm_area_struct *vma, struct list_head *to_kill,
unsigned long addr) unsigned long addr)
{ {
@ -606,8 +606,9 @@ struct task_struct *task_early_kill(struct task_struct *tsk, int force_early)
/* /*
* Collect processes when the error hit an anonymous page. * Collect processes when the error hit an anonymous page.
*/ */
static void collect_procs_anon(struct folio *folio, struct page *page, static void collect_procs_anon(const struct folio *folio,
struct list_head *to_kill, int force_early) const struct page *page, struct list_head *to_kill,
int force_early)
{ {
struct task_struct *tsk; struct task_struct *tsk;
struct anon_vma *av; struct anon_vma *av;
@ -643,8 +644,9 @@ static void collect_procs_anon(struct folio *folio, struct page *page,
/* /*
* Collect processes when the error hit a file mapped page. * Collect processes when the error hit a file mapped page.
*/ */
static void collect_procs_file(struct folio *folio, struct page *page, static void collect_procs_file(const struct folio *folio,
struct list_head *to_kill, int force_early) const struct page *page, struct list_head *to_kill,
int force_early)
{ {
struct vm_area_struct *vma; struct vm_area_struct *vma;
struct task_struct *tsk; struct task_struct *tsk;
@ -680,7 +682,7 @@ static void collect_procs_file(struct folio *folio, struct page *page,
} }
#ifdef CONFIG_FS_DAX #ifdef CONFIG_FS_DAX
static void add_to_kill_fsdax(struct task_struct *tsk, struct page *p, static void add_to_kill_fsdax(struct task_struct *tsk, const struct page *p,
struct vm_area_struct *vma, struct vm_area_struct *vma,
struct list_head *to_kill, pgoff_t pgoff) struct list_head *to_kill, pgoff_t pgoff)
{ {
@ -691,7 +693,7 @@ static void add_to_kill_fsdax(struct task_struct *tsk, struct page *p,
/* /*
* Collect processes when the error hit a fsdax page. * Collect processes when the error hit a fsdax page.
*/ */
static void collect_procs_fsdax(struct page *page, static void collect_procs_fsdax(const struct page *page,
struct address_space *mapping, pgoff_t pgoff, struct address_space *mapping, pgoff_t pgoff,
struct list_head *to_kill, bool pre_remove) struct list_head *to_kill, bool pre_remove)
{ {
@ -725,7 +727,7 @@ static void collect_procs_fsdax(struct page *page,
/* /*
* Collect the processes who have the corrupted page mapped to kill. * Collect the processes who have the corrupted page mapped to kill.
*/ */
static void collect_procs(struct folio *folio, struct page *page, static void collect_procs(const struct folio *folio, const struct page *page,
struct list_head *tokill, int force_early) struct list_head *tokill, int force_early)
{ {
if (!folio->mapping) if (!folio->mapping)

5
mm/page_vma_mapped.c
View File

@ -337,9 +337,10 @@ next_pte:
* outside the VMA or not present, returns -EFAULT. * outside the VMA or not present, returns -EFAULT.
* Only valid for normal file or anonymous VMAs. * Only valid for normal file or anonymous VMAs.
*/ */
unsigned long page_mapped_in_vma(struct page *page, struct vm_area_struct *vma) unsigned long page_mapped_in_vma(const struct page *page,
struct vm_area_struct *vma)
{ {
struct folio *folio = page_folio(page); const struct folio *folio = page_folio(page);
struct page_vma_mapped_walk pvmw = { struct page_vma_mapped_walk pvmw = {
.pfn = page_to_pfn(page), .pfn = page_to_pfn(page),
.nr_pages = 1, .nr_pages = 1,

11
mm/rmap.c
View File

@ -496,7 +496,7 @@ void __init anon_vma_init(void)
* concurrently without folio lock protection). See folio_lock_anon_vma_read() * concurrently without folio lock protection). See folio_lock_anon_vma_read()
* which has already covered that, and comment above remap_pages(). * which has already covered that, and comment above remap_pages().
*/ */
struct anon_vma *folio_get_anon_vma(struct folio *folio) struct anon_vma *folio_get_anon_vma(const struct folio *folio)
{ {
struct anon_vma *anon_vma = NULL; struct anon_vma *anon_vma = NULL;
unsigned long anon_mapping; unsigned long anon_mapping;
@ -540,7 +540,7 @@ out:
* reference like with folio_get_anon_vma() and then block on the mutex * reference like with folio_get_anon_vma() and then block on the mutex
* on !rwc->try_lock case. * on !rwc->try_lock case.
*/ */
struct anon_vma *folio_lock_anon_vma_read(struct folio *folio, struct anon_vma *folio_lock_anon_vma_read(const struct folio *folio,
struct rmap_walk_control *rwc) struct rmap_walk_control *rwc)
{ {
struct anon_vma *anon_vma = NULL; struct anon_vma *anon_vma = NULL;
@ -1271,8 +1271,9 @@ static void __folio_set_anon(struct folio *folio, struct vm_area_struct *vma,
* @vma: the vm area in which the mapping is added * @vma: the vm area in which the mapping is added
* @address: the user virtual address mapped * @address: the user virtual address mapped
*/ */
static void __page_check_anon_rmap(struct folio *folio, struct page *page, static void __page_check_anon_rmap(const struct folio *folio,
struct vm_area_struct *vma, unsigned long address) const struct page *page, struct vm_area_struct *vma,
unsigned long address)
{ {
/* /*
* The page's anon-rmap details (mapping and index) are guaranteed to * The page's anon-rmap details (mapping and index) are guaranteed to
@ -2569,7 +2570,7 @@ void __put_anon_vma(struct anon_vma *anon_vma)
anon_vma_free(root); anon_vma_free(root);
} }
static struct anon_vma *rmap_walk_anon_lock(struct folio *folio, static struct anon_vma *rmap_walk_anon_lock(const struct folio *folio,
struct rmap_walk_control *rwc) struct rmap_walk_control *rwc)
{ {
struct anon_vma *anon_vma; struct anon_vma *anon_vma;