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Code Issues Releases Wiki Activity

uprobes: use new_folio in __replace_page() 

Saves several calls to compound_head().

Link: https://lkml.kernel.org/r/20220902194653.1739778-57-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) 2022-09-02 20:46:52 +01:00 committed by Andrew Morton
parent 0c826c0b6a
commit 82e66bf761
1 changed files with 5 additions and 4 deletions
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9
kernel/events/uprobes.c
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@ -155,6 +155,7 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
struct page *old_page, struct page *new_page)
{
struct folio *old_folio = page_folio(old_page);
struct folio *new_folio;
struct mm_struct *mm = vma->vm_mm;
DEFINE_FOLIO_VMA_WALK(pvmw, old_folio, vma, addr, 0);
int err;
@ -164,8 +165,8 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
addr + PAGE_SIZE);
if (new_page) {
err = mem_cgroup_charge(page_folio(new_page), vma->vm_mm,
GFP_KERNEL);
new_folio = page_folio(new_page);
err = mem_cgroup_charge(new_folio, vma->vm_mm, GFP_KERNEL);
if (err)
return err;
}
@ -180,9 +181,9 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
VM_BUG_ON_PAGE(addr != pvmw.address, old_page);
if (new_page) {
get_page(new_page);
folio_get(new_folio);
page_add_new_anon_rmap(new_page, vma, addr);
lru_cache_add_inactive_or_unevictable(new_page, vma);
folio_add_lru_vma(new_folio, vma);
} else
/* no new page, just dec_mm_counter for old_page */
dec_mm_counter(mm, MM_ANONPAGES);