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authorMatthew Wilcox <mawilcox@microsoft.com>2018-01-31 16:18:58 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-01-31 17:18:38 -0800
commit0dd4da5b110c6915d4244b8ed87a1c8d3945224b (patch)
tree69ad0fb64702834985ae993daeaef5ad31943a34 /include/linux
parentb26435a0115b245ea2dd705efcce877ec417bc74 (diff)
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.org Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Christoph Lameter <cl@linux.com> Cc: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/mm_types.h21
1 files changed, 8 insertions, 13 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 8c3b8cea22ee..5521c9799c50 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -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;