github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-04 04:23:35 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

ptdesc: convert __page_flags to pt_flags

Browse Source 
Patch series "Some ptdesc cleanups".

The first two patches here are preparation for splitting struct ptdesc
from struct page and struct folio.  I think their only dependency is on
the memdesc_flags_t patches from August which is in mm-new.  The third
patch is just something I noticed while working on the code.


This patch (of 3):

Use the new memdesc_flags_t type to show that these are the same bits as
page/folio/slab and thesefore have the zone/node/section information in
them.  Remove a use of ptdesc_folio() by converting
pagetable_is_reserved() to use test_bit() directly.

Link: https://lkml.kernel.org/r/20250908171104.2409217-1-willy@infradead.org
Link: https://lkml.kernel.org/r/20250908171104.2409217-2-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2025-09-08 18:11:00 +01:00 committed by Andrew Morton
parent 6106864b87
commit 522abd9227
2 changed files with 9 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/linux/mm.h
View File

@ -2934,6 +2934,11 @@ static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long a
}
#endif /* CONFIG_MMU */
enum pt_flags {
PT_reserved = PG_reserved,
/* High bits are used for zone/node/section */
};
static inline struct ptdesc *virt_to_ptdesc(const void *x)
{
return page_ptdesc(virt_to_page(x));
@ -2951,7 +2956,7 @@ static inline void *ptdesc_address(const struct ptdesc *pt)
static inline bool pagetable_is_reserved(struct ptdesc *pt)
{
return folio_test_reserved(ptdesc_folio(pt));
return test_bit(PT_reserved, &pt->pt_flags.f);
}
/**

6
include/linux/mm_types.h
View File

@ -524,7 +524,7 @@ FOLIO_MATCH(compound_head, _head_3);
/**
* struct ptdesc - Memory descriptor for page tables.
* @__page_flags: Same as page flags. Powerpc only.
* @pt_flags: enum pt_flags plus zone/node/section.
* @pt_rcu_head: For freeing page table pages.
* @pt_list: List of used page tables. Used for s390 gmap shadow pages
* (which are not linked into the user page tables) and x86
@ -546,7 +546,7 @@ FOLIO_MATCH(compound_head, _head_3);
* understanding of the issues.
*/
struct ptdesc {
unsigned long __page_flags;
memdesc_flags_t pt_flags;
union {
struct rcu_head pt_rcu_head;
@ -584,7 +584,7 @@ struct ptdesc {
#define TABLE_MATCH(pg, pt) \
static_assert(offsetof(struct page, pg) == offsetof(struct ptdesc, pt))
TABLE_MATCH(flags, __page_flags);
TABLE_MATCH(flags, pt_flags);
TABLE_MATCH(compound_head, pt_list);
TABLE_MATCH(compound_head, _pt_pad_1);
TABLE_MATCH(mapping, __page_mapping);