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mm/rmap: remove RMAP_COMPOUND

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No longer used, let's remove it and clarify RMAP_NONE/RMAP_EXCLUSIVE a
bit.

Link: https://lkml.kernel.org/r/20231220224504.646757-23-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Yin Fengwei <fengwei.yin@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2023-12-20 23:44:46 +01:00 committed by Andrew Morton
parent 84f0169e6c
commit 0cae959e3a
2 changed files with 3 additions and 11 deletions
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12
include/linux/rmap.h
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@ -177,20 +177,14 @@ struct anon_vma *folio_get_anon_vma(struct folio *folio);
typedef int __bitwise rmap_t;
/*
* No special request: if the page is a subpage of a compound page, it is
* mapped via a PTE. The mapped (sub)page is possibly shared between processes.
* No special request: A mapped anonymous (sub)page is possibly shared between
* processes.
*/
#define RMAP_NONE ((__force rmap_t)0)
/* The (sub)page is exclusive to a single process. */
/* The anonymous (sub)page is exclusive to a single process. */
#define RMAP_EXCLUSIVE ((__force rmap_t)BIT(0))
/*
* The compound page is not mapped via PTEs, but instead via a single PMD and
* should be accounted accordingly.
*/
#define RMAP_COMPOUND ((__force rmap_t)BIT(1))
/*
* Internally, we're using an enum to specify the granularity. We make the
* compiler emit specialized code for each granularity.

2
mm/rmap.c
View File

@ -2662,8 +2662,6 @@ void rmap_walk_locked(struct folio *folio, struct rmap_walk_control *rwc)
* The following two functions are for anonymous (private mapped) hugepages.
* Unlike common anonymous pages, anonymous hugepages have no accounting code
* and no lru code, because we handle hugepages differently from common pages.
*
* RMAP_COMPOUND is ignored.
*/
void hugetlb_add_anon_rmap(struct folio *folio, struct vm_area_struct *vma,
unsigned long address, rmap_t flags)