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mm: pgtable: remove pte_offset_map_nolock()

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Now no users are using the pte_offset_map_nolock(), remove it.

Link: https://lkml.kernel.org/r/d04f9bbbcde048fb6ffa6f2bdbc6f9b22d5286f9.1727332572.git.zhengqi.arch@bytedance.com
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Reviewed-by: Muchun Song <muchun.song@linux.dev>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Qi Zheng 2024-09-26 14:46:26 +08:00 committed by Andrew Morton
parent 2441774f2d
commit 583e66debd
3 changed files with 0 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/mm/split_page_table_lock.rst
View File

@ -16,9 +16,6 @@ There are helpers to lock/unlock a table and other accessor functions:
- pte_offset_map_lock()
maps PTE and takes PTE table lock, returns pointer to PTE with
pointer to its PTE table lock, or returns NULL if no PTE table;
- pte_offset_map_nolock()
maps PTE, returns pointer to PTE with pointer to its PTE table
lock (not taken), or returns NULL if no PTE table;
- pte_offset_map_ro_nolock()
maps PTE, returns pointer to PTE with pointer to its PTE table
lock (not taken), or returns NULL if no PTE table;

2
include/linux/mm.h
View File

@ -3015,8 +3015,6 @@ static inline pte_t *pte_offset_map_lock(struct mm_struct *mm, pmd_t *pmd,
return pte;
}
pte_t *pte_offset_map_nolock(struct mm_struct *mm, pmd_t *pmd,
unsigned long addr, spinlock_t **ptlp);
pte_t *pte_offset_map_ro_nolock(struct mm_struct *mm, pmd_t *pmd,
unsigned long addr, spinlock_t **ptlp);
pte_t *pte_offset_map_rw_nolock(struct mm_struct *mm, pmd_t *pmd,

21
mm/pgtable-generic.c
View File

@ -305,18 +305,6 @@ pte_t *__pte_offset_map(pmd_t *pmd, unsigned long addr, pmd_t *pmdvalp)
return NULL;
}
pte_t *pte_offset_map_nolock(struct mm_struct *mm, pmd_t *pmd,
unsigned long addr, spinlock_t **ptlp)
{
pmd_t pmdval;
pte_t *pte;
pte = __pte_offset_map(pmd, addr, &pmdval);
if (likely(pte))
*ptlp = pte_lockptr(mm, &pmdval);
return pte;
}
pte_t *pte_offset_map_ro_nolock(struct mm_struct *mm, pmd_t *pmd,
unsigned long addr, spinlock_t **ptlp)
{
@ -372,15 +360,6 @@ pte_t *pte_offset_map_rw_nolock(struct mm_struct *mm, pmd_t *pmd,
* and disconnected table. Until pte_unmap(pte) unmaps and rcu_read_unlock()s
* afterwards.
*
* pte_offset_map_nolock(mm, pmd, addr, ptlp), above, is like pte_offset_map();
* but when successful, it also outputs a pointer to the spinlock in ptlp - as
* pte_offset_map_lock() does, but in this case without locking it. This helps
* the caller to avoid a later pte_lockptr(mm, *pmd), which might by that time
* act on a changed *pmd: pte_offset_map_nolock() provides the correct spinlock
* pointer for the page table that it returns. In principle, the caller should
* recheck *pmd once the lock is taken; in practice, no callsite needs that -
* either the mmap_lock for write, or pte_same() check on contents, is enough.
*
* pte_offset_map_ro_nolock(mm, pmd, addr, ptlp), above, is like pte_offset_map();
* but when successful, it also outputs a pointer to the spinlock in ptlp - as
* pte_offset_map_lock() does, but in this case without locking it. This helps