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Revert "mm: add private field of first tail to struct page and struct folio"

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This reverts commit 271227f13f which is
commit d340625f48 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: Idb42cdd16d37a180911fe1a335744c02aaf683dc
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Greg Kroah-Hartman
2024-07-20 12:50:36 +00:00
parent edd74f93c0
commit 323d7963f9
1 changed files with 0 additions and 14 deletions
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14
include/linux/mm_types.h
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@@ -145,7 +145,6 @@ struct page {
atomic_t compound_pincount;
#ifdef CONFIG_64BIT
unsigned int compound_nr; /* 1 << compound_order */
unsigned long _private_1;
#endif
};
struct { /* Second tail page of compound page */
@@ -266,7 +265,6 @@ struct page {
* @_total_mapcount: Do not use directly, call folio_entire_mapcount().
* @_pincount: Do not use directly, call folio_maybe_dma_pinned().
* @_folio_nr_pages: Do not use directly, call folio_nr_pages().
* @_private_1: Do not use directly, call folio_get_private_1().
*
* A folio is a physically, virtually and logically contiguous set
* of bytes. It is a power-of-two in size, and it is aligned to that
@@ -314,7 +312,6 @@ struct folio {
#ifdef CONFIG_64BIT
unsigned int _folio_nr_pages;
#endif
unsigned long _private_1;
};
#define FOLIO_MATCH(pg, fl) \
@@ -342,7 +339,6 @@ FOLIO_MATCH(compound_mapcount, _total_mapcount);
FOLIO_MATCH(compound_pincount, _pincount);
#ifdef CONFIG_64BIT
FOLIO_MATCH(compound_nr, _folio_nr_pages);
FOLIO_MATCH(_private_1, _private_1);
#endif
#undef FOLIO_MATCH
@@ -388,16 +384,6 @@ static inline void *folio_get_private(struct folio *folio)
return folio->private;
}
static inline void folio_set_private_1(struct folio *folio, unsigned long private)
{
folio->_private_1 = private;
}
static inline unsigned long folio_get_private_1(struct folio *folio)
{
return folio->_private_1;
}
struct page_frag_cache {
void * va;
#if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE)