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mm/memory.c: use folios in __copy_remote_vm_str()

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Patch series "Remove unmap_and_put_page()".

This patchset uses folios in both the callers of unmap_and_put_page(),
saving a couple calls to compound_head() wrappers.


This patch (of 3):

Use kmap_local_folio() instead of kmap_local_page().  Replaces 2 calls to
compound_head() from unmap_and_put_page() with one.

This prepares us for the removal of unmap_and_put_page().

Link: https://lkml.kernel.org/r/20250709194017.927978-3-vishal.moola@gmail.com
Link: https://lkml.kernel.org/r/20250709194017.927978-4-vishal.moola@gmail.com
Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Jordan Rome <linux@jordanrome.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Vishal Moola (Oracle) 2025-07-09 12:40:16 -07:00 committed by Andrew Morton
parent db87a4e236
commit 0ec5eea208
1 changed files with 5 additions and 3 deletions
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8
mm/memory.c
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@ -6815,6 +6815,7 @@ static int __copy_remote_vm_str(struct mm_struct *mm, unsigned long addr,
while (len) {
int bytes, offset, retval;
void *maddr;
struct folio *folio;
struct page *page;
struct vm_area_struct *vma = NULL;
@ -6830,17 +6831,18 @@ static int __copy_remote_vm_str(struct mm_struct *mm, unsigned long addr,
goto out;
}
folio = page_folio(page);
bytes = len;
offset = addr & (PAGE_SIZE - 1);
if (bytes > PAGE_SIZE - offset)
bytes = PAGE_SIZE - offset;
maddr = kmap_local_page(page);
maddr = kmap_local_folio(folio, folio_page_idx(folio, page) * PAGE_SIZE);
retval = strscpy(buf, maddr + offset, bytes);
if (retval >= 0) {
/* Found the end of the string */
buf += retval;
unmap_and_put_page(page, maddr);
folio_release_kmap(folio, maddr);
break;
}
@ -6858,7 +6860,7 @@ static int __copy_remote_vm_str(struct mm_struct *mm, unsigned long addr,
}
len -= bytes;
unmap_and_put_page(page, maddr);
folio_release_kmap(folio, maddr);
}
out: