The patch titled
Subject: mm: constify get_pfnblock_flags_mask and get_pfnblock_migratetype
has been added to the -mm tree. Its filename is
mm-constify-get_pfnblock_flags_mask-and-get_pfnblock_migratetype.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-constify-get_pfnblock_flags_mask-and-get_pfnblock_migratetype.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-constify-get_pfnblock_flags_mask-and-get_pfnblock_migratetype.patch
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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: mm: constify get_pfnblock_flags_mask and get_pfnblock_migratetype
The struct page is not modified by these routines, so it can be marked
const.
Link: https://lkml.kernel.org/r/20210416231531.2521383-6-willy@xxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: Vlastimil Babka <vbabka@xxxxxxx>
Reviewed-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
Reviewed-by: William Kucharski <william.kucharski@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/pageblock-flags.h | 2 +-
mm/page_alloc.c | 13 +++++++------
2 files changed, 8 insertions(+), 7 deletions(-)
--- a/include/linux/pageblock-flags.h~mm-constify-get_pfnblock_flags_mask-and-get_pfnblock_migratetype
+++ a/include/linux/pageblock-flags.h
@@ -54,7 +54,7 @@ extern unsigned int pageblock_order;
/* Forward declaration */
struct page;
-unsigned long get_pfnblock_flags_mask(struct page *page,
+unsigned long get_pfnblock_flags_mask(const struct page *page,
unsigned long pfn,
unsigned long mask);
--- a/mm/page_alloc.c~mm-constify-get_pfnblock_flags_mask-and-get_pfnblock_migratetype
+++ a/mm/page_alloc.c
@@ -474,7 +474,7 @@ static inline bool defer_init(int nid, u
#endif
/* Return a pointer to the bitmap storing bits affecting a block of pages */
-static inline unsigned long *get_pageblock_bitmap(struct page *page,
+static inline unsigned long *get_pageblock_bitmap(const struct page *page,
unsigned long pfn)
{
#ifdef CONFIG_SPARSEMEM
@@ -484,7 +484,7 @@ static inline unsigned long *get_pageblo
#endif /* CONFIG_SPARSEMEM */
}
-static inline int pfn_to_bitidx(struct page *page, unsigned long pfn)
+static inline int pfn_to_bitidx(const struct page *page, unsigned long pfn)
{
#ifdef CONFIG_SPARSEMEM
pfn &= (PAGES_PER_SECTION-1);
@@ -495,7 +495,7 @@ static inline int pfn_to_bitidx(struct p
}
static __always_inline
-unsigned long __get_pfnblock_flags_mask(struct page *page,
+unsigned long __get_pfnblock_flags_mask(const struct page *page,
unsigned long pfn,
unsigned long mask)
{
@@ -520,13 +520,14 @@ unsigned long __get_pfnblock_flags_mask(
*
* Return: pageblock_bits flags
*/
-unsigned long get_pfnblock_flags_mask(struct page *page, unsigned long pfn,
- unsigned long mask)
+unsigned long get_pfnblock_flags_mask(const struct page *page,
+ unsigned long pfn, unsigned long mask)
{
return __get_pfnblock_flags_mask(page, pfn, mask);
}
-static __always_inline int get_pfnblock_migratetype(struct page *page, unsigned long pfn)
+static __always_inline int get_pfnblock_migratetype(const struct page *page,
+ unsigned long pfn)
{
return __get_pfnblock_flags_mask(page, pfn, MIGRATETYPE_MASK);
}
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
mm-make-__dump_page-static.patch
mm-debug-factor-pagepoisoned-out-of-__dump_page.patch
mm-page_owner-constify-dump_page_owner.patch
mm-make-compound_head-const-preserving.patch
mm-constify-get_pfnblock_flags_mask-and-get_pfnblock_migratetype.patch
mm-constify-page_count-and-page_ref_count.patch
