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zsmalloc: Stop using slab fields in struct page

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The ->freelist and ->units members of struct page are for the use of
slab only.  I'm not particularly familiar with zsmalloc, so generate the
same code by using page->index to store 'page' (page->index and
page->freelist are at the same offset in struct page).  This should be
cleaned up properly at some point by somebody who is familiar with
zsmalloc.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Minchan Kim <minchan@kernel.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-10-04 14:46:47 +01:00 committed by Vlastimil Babka
parent 9c01e9af17
commit ffedd09fa9
1 changed files with 9 additions and 9 deletions
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18
mm/zsmalloc.c
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@ -17,10 +17,10 @@
* *
* Usage of struct page fields: * Usage of struct page fields:
* page->private: points to zspage * page->private: points to zspage
* page->freelist(index): links together all component pages of a zspage * page->index: links together all component pages of a zspage
* For the huge page, this is always 0, so we use this field * For the huge page, this is always 0, so we use this field
* to store handle. * to store handle.
* page->units: first object offset in a subpage of zspage * page->page_type: first object offset in a subpage of zspage
* *
* Usage of struct page flags: * Usage of struct page flags:
* PG_private: identifies the first component page * PG_private: identifies the first component page
@ -489,12 +489,12 @@ static inline struct page *get_first_page(struct zspage *zspage)
static inline int get_first_obj_offset(struct page *page) static inline int get_first_obj_offset(struct page *page)
{ {
return page->units; return page->page_type;
} }
static inline void set_first_obj_offset(struct page *page, int offset) static inline void set_first_obj_offset(struct page *page, int offset)
{ {
page->units = offset; page->page_type = offset;
} }
static inline unsigned int get_freeobj(struct zspage *zspage) static inline unsigned int get_freeobj(struct zspage *zspage)
@ -827,7 +827,7 @@ static struct page *get_next_page(struct page *page)
if (unlikely(PageHugeObject(page))) if (unlikely(PageHugeObject(page)))
return NULL; return NULL;
return page->freelist; return (struct page *)page->index;
} }
/** /**
@ -901,7 +901,7 @@ static void reset_page(struct page *page)
set_page_private(page, 0); set_page_private(page, 0);
page_mapcount_reset(page); page_mapcount_reset(page);
ClearPageHugeObject(page); ClearPageHugeObject(page);
page->freelist = NULL; page->index = 0;
} }
static int trylock_zspage(struct zspage *zspage) static int trylock_zspage(struct zspage *zspage)
@ -1027,7 +1027,7 @@ static void create_page_chain(struct size_class *class, struct zspage *zspage,
/* /*
* Allocate individual pages and link them together as: * Allocate individual pages and link them together as:
* 1. all pages are linked together using page->freelist * 1. all pages are linked together using page->index
* 2. each sub-page point to zspage using page->private * 2. each sub-page point to zspage using page->private
* *
* we set PG_private to identify the first page (i.e. no other sub-page * we set PG_private to identify the first page (i.e. no other sub-page
@ -1036,7 +1036,7 @@ static void create_page_chain(struct size_class *class, struct zspage *zspage,
for (i = 0; i < nr_pages; i++) { for (i = 0; i < nr_pages; i++) {
page = pages[i]; page = pages[i];
set_page_private(page, (unsigned long)zspage); set_page_private(page, (unsigned long)zspage);
page->freelist = NULL; page->index = 0;
if (i == 0) { if (i == 0) {
zspage->first_page = page; zspage->first_page = page;
SetPagePrivate(page); SetPagePrivate(page);
@ -1044,7 +1044,7 @@ static void create_page_chain(struct size_class *class, struct zspage *zspage,
class->pages_per_zspage == 1)) class->pages_per_zspage == 1))
SetPageHugeObject(page); SetPageHugeObject(page);
} else { } else {
prev_page->freelist = page; prev_page->index = (unsigned long)page;
} }
prev_page = page; prev_page = page;
} }