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mm: make page_ext_get() take a const argument

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In order to constify other functions, we need page_ext_get() to be const. 
This is no problem as lookup_page_ext() already takes a const argument.

Link: https://lkml.kernel.org/r/20240326171045.410737-4-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2024-03-26 17:10:25 +00:00 committed by Andrew Morton
parent fa92722e38
commit 6e65aa55cd
3 changed files with 3 additions and 5 deletions
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4
include/linux/page_ext.h
View File

@ -77,7 +77,7 @@ static inline void page_ext_init(void)
}
#endif
extern struct page_ext *page_ext_get(struct page *page);
extern struct page_ext *page_ext_get(const struct page *page);
extern void page_ext_put(struct page_ext *page_ext);
static inline void *page_ext_data(struct page_ext *page_ext,
@ -117,7 +117,7 @@ static inline void page_ext_init_flatmem(void)
{
}
static inline struct page_ext *page_ext_get(struct page *page)
static inline struct page_ext *page_ext_get(const struct page *page)
{
return NULL;
}

2
include/linux/pgalloc_tag.h
View File

@ -12,8 +12,6 @@
#include <linux/page_ext.h>
extern struct page_ext_operations page_alloc_tagging_ops;
extern struct page_ext *page_ext_get(struct page *page);
extern void page_ext_put(struct page_ext *page_ext);
static inline union codetag_ref *codetag_ref_from_page_ext(struct page_ext *page_ext)
{

2
mm/page_ext.c
View File

@ -514,7 +514,7 @@ void __meminit pgdat_page_ext_init(struct pglist_data *pgdat)
* Context: Any context. Caller may not sleep until they have called
* page_ext_put().
*/
struct page_ext *page_ext_get(struct page *page)
struct page_ext *page_ext_get(const struct page *page)
{
struct page_ext *page_ext;