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UPSTREAM: mm/ksm: Remove reuse_ksm_page()

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Remove the function as the last reference has gone away with the do_wp_page()
changes.

Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit 1a0cf26323c80e2f1c58fc04f15686de61bfab0c)

Bug: 176847924
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Change-Id: I70e5938a046d0fc449288ae46c83cb7c39d7de48
This commit is contained in:
Peter Xu 2020-08-21 19:49:56 -04:00 committed by spakkkk
parent 1bb6e8409b
commit 4342b61384
2 changed files with 0 additions and 32 deletions
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7
include/linux/ksm.h
View File

@ -53,8 +53,6 @@ struct page *ksm_might_need_to_copy(struct page *page,
void rmap_walk_ksm(struct page *page, struct rmap_walk_control *rwc);
void ksm_migrate_page(struct page *newpage, struct page *oldpage);
bool reuse_ksm_page(struct page *page,
struct vm_area_struct *vma, unsigned long address);
#else /* !CONFIG_KSM */
@ -88,11 +86,6 @@ static inline void rmap_walk_ksm(struct page *page,
static inline void ksm_migrate_page(struct page *newpage, struct page *oldpage)
{
}
static inline bool reuse_ksm_page(struct page *page,
struct vm_area_struct *vma, unsigned long address)
{
return false;
}
#endif /* CONFIG_MMU */
#endif /* !CONFIG_KSM */

25
mm/ksm.c
View File

@ -2650,31 +2650,6 @@ again:
goto again;
}
bool reuse_ksm_page(struct page *page,
struct vm_area_struct *vma,
unsigned long address)
{
#ifdef CONFIG_DEBUG_VM
if (WARN_ON(is_zero_pfn(page_to_pfn(page))) ||
WARN_ON(!page_mapped(page)) ||
WARN_ON(!PageLocked(page))) {
dump_page(page, "reuse_ksm_page");
return false;
}
#endif
if (PageSwapCache(page) || !page_stable_node(page))
return false;
/* Prohibit parallel get_ksm_page() */
if (!page_ref_freeze(page, 1))
return false;
page_move_anon_rmap(page, vma);
page->index = linear_page_index(vma, address);
page_ref_unfreeze(page, 1);
return true;
}
#ifdef CONFIG_MIGRATION
void ksm_migrate_page(struct page *newpage, struct page *oldpage)
{