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mm/gup: Remove hpage_pincount_sub()

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Move the assertion (and correct it to be a cheaper variant),
and inline the atomic_sub() operation.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-01-07 14:19:39 -05:00
parent 78d9d6ced3
commit 6315d8a23c
1 changed files with 3 additions and 10 deletions
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13
mm/gup.c
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@ -29,14 +29,6 @@ struct follow_page_context {
unsigned int page_mask;
};
static void hpage_pincount_sub(struct page *page, int refs)
{
VM_BUG_ON_PAGE(!hpage_pincount_available(page), page);
VM_BUG_ON_PAGE(page != compound_head(page), page);
atomic_sub(refs, compound_pincount_ptr(page));
}
/* Equivalent to calling put_page() @refs times. */
static void put_page_refs(struct page *page, int refs)
{
@ -169,12 +161,13 @@ __maybe_unused struct page *try_grab_compound_head(struct page *page,
static void put_compound_head(struct page *page, int refs, unsigned int flags)
{
VM_BUG_ON_PAGE(PageTail(page), page);
if (flags & FOLL_PIN) {
mod_node_page_state(page_pgdat(page), NR_FOLL_PIN_RELEASED,
refs);
if (hpage_pincount_available(page))
hpage_pincount_sub(page, refs);
atomic_sub(refs, compound_pincount_ptr(page));
else
refs *= GUP_PIN_COUNTING_BIAS;
}