zsmalloc: use page->private instead of page->first_page
We are going to rework how compound_head() work. It will not use page->first_page as we have it now. The only other user of page->first_page beyond compound pages is zsmalloc. Let's use page->private instead of page->first_page here. It occupies the same storage space. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Reviewed-by: Andrea Arcangeli <aarcange@redhat.com> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Hugh Dickins <hughd@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -16,7 +16,7 @@
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* struct page(s) to form a zspage.
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*
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* Usage of struct page fields:
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* page->first_page: points to the first component (0-order) page
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* page->private: points to the first component (0-order) page
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* page->index (union with page->freelist): offset of the first object
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* starting in this page. For the first page, this is
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* always 0, so we use this field (aka freelist) to point
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@ -26,8 +26,7 @@
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*
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* For _first_ page only:
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*
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* page->private (union with page->first_page): refers to the
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* component page after the first page
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* page->private: refers to the component page after the first page
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* If the page is first_page for huge object, it stores handle.
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* Look at size_class->huge.
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* page->freelist: points to the first free object in zspage.
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@ -774,7 +773,7 @@ static struct page *get_first_page(struct page *page)
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if (is_first_page(page))
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return page;
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else
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return page->first_page;
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return (struct page *)page_private(page);
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}
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static struct page *get_next_page(struct page *page)
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@ -959,7 +958,7 @@ static struct page *alloc_zspage(struct size_class *class, gfp_t flags)
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* Allocate individual pages and link them together as:
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* 1. first page->private = first sub-page
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* 2. all sub-pages are linked together using page->lru
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* 3. each sub-page is linked to the first page using page->first_page
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* 3. each sub-page is linked to the first page using page->private
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*
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* For each size class, First/Head pages are linked together using
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* page->lru. Also, we set PG_private to identify the first page
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@ -984,7 +983,7 @@ static struct page *alloc_zspage(struct size_class *class, gfp_t flags)
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if (i == 1)
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set_page_private(first_page, (unsigned long)page);
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if (i >= 1)
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page->first_page = first_page;
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set_page_private(page, (unsigned long)first_page);
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if (i >= 2)
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list_add(&page->lru, &prev_page->lru);
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if (i == class->pages_per_zspage - 1) /* last page */
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