Commit 0dd4da5b authored by Matthew Wilcox's avatar Matthew Wilcox Committed by Linus Torvalds

mm: introduce _slub_counter_t

Instead of putting the ifdef in the middle of the definition of struct
page, pull it forward to the rest of the ifdeffery around the SLUB
cmpxchg_double optimisation.

Link: http://lkml.kernel.org/r/20171220155552.15884-6-willy@infradead.orgSigned-off-by: default avatarMatthew Wilcox <mawilcox@microsoft.com>
Acked-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: default avatarMichal Hocko <mhocko@suse.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b26435a0
......@@ -41,9 +41,15 @@ struct hmm;
*/
#ifdef CONFIG_HAVE_ALIGNED_STRUCT_PAGE
#define _struct_page_alignment __aligned(2 * sizeof(unsigned long))
#if defined(CONFIG_HAVE_CMPXCHG_DOUBLE)
#define _slub_counter_t unsigned long
#else
#define _struct_page_alignment
#define _slub_counter_t unsigned int
#endif
#else /* !CONFIG_HAVE_ALIGNED_STRUCT_PAGE */
#define _struct_page_alignment
#define _slub_counter_t unsigned int
#endif /* !CONFIG_HAVE_ALIGNED_STRUCT_PAGE */
struct page {
/* First double word block */
......@@ -66,18 +72,7 @@ struct page {
};
union {
#if defined(CONFIG_HAVE_CMPXCHG_DOUBLE) && \
defined(CONFIG_HAVE_ALIGNED_STRUCT_PAGE)
/* Used for cmpxchg_double in slub */
unsigned long counters;
#else
/*
* Keep _refcount separate from slub cmpxchg_double data.
* As the rest of the double word is protected by slab_lock
* but _refcount is not.
*/
unsigned counters;
#endif
_slub_counter_t counters;
unsigned int active; /* SLAB */
struct { /* SLUB */
unsigned inuse:16;
......
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