mm: use page->private instead of page->index in percpu

Matthew Wilcox (Oracle) · akpm00 · commit 33d7f15f916e · 2024-11-07T14:38:07.000-08:00
The percpu allocator only uses one field in struct page, just change it from page->index to page->private. Link: https://lkml.kernel.org/r/20241005200121.3231142-8-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
diff --git a/mm/percpu.c b/mm/percpu.c
@@ -253,13 +253,13 @@ static int pcpu_chunk_slot(const struct pcpu_chunk *chunk)
 /* set the pointer to a chunk in a page struct */
 static void pcpu_set_page_chunk(struct page *page, struct pcpu_chunk *pcpu)
 {
-	page->index = (unsigned long)pcpu;
+	page->private = (unsigned long)pcpu;
 }
 
 /* obtain pointer to a chunk from a page struct */
 static struct pcpu_chunk *pcpu_get_page_chunk(struct page *page)
 {
-	return (struct pcpu_chunk *)page->index;
+	return (struct pcpu_chunk *)page->private;
 }
 
 static int __maybe_unused pcpu_page_idx(unsigned int cpu, int page_idx)

Original file line number	Diff line number	Diff line change
`@@ -253,13 +253,13 @@ static int pcpu_chunk_slot(const struct pcpu_chunk *chunk)`
`253`	`253`	`/* set the pointer to a chunk in a page struct */`
`254`	`254`	`static void pcpu_set_page_chunk(struct page page, struct pcpu_chunk pcpu)`
`255`	`255`	`{`
`256`		`- page->index = (unsigned long)pcpu;`
	`256`	`+ page->private = (unsigned long)pcpu;`
`257`	`257`	`}`
`258`	`258`
`259`	`259`	`/* obtain pointer to a chunk from a page struct */`
`260`	`260`	`static struct pcpu_chunk pcpu_get_page_chunk(struct page page)`
`261`	`261`	`{`
`262`		`- return (struct pcpu_chunk *)page->index;`
	`262`	`+ return (struct pcpu_chunk *)page->private;`
`263`	`263`	`}`
`264`	`264`
`265`	`265`	`static int __maybe_unused pcpu_page_idx(unsigned int cpu, int page_idx)`