LU-9859 libcfs: move tgt_descs to standard Linux bitmaps.

[fs/lustre-release.git] / libcfs / include / libcfs / linux / linux-mem.h

diff --git a/libcfs/include/libcfs/linux/linux-mem.h b/libcfs/include/libcfs/linux/linux-mem.h
index 086d16b..80668b1 100644 (file)
--- a/libcfs/include/libcfs/linux/linux-mem.h
+++ b/libcfs/include/libcfs/linux/linux-mem.h
@@ -37,14 +37,6 @@
 #ifndef __LIBCFS_LINUX_CFS_MEM_H__
 #define __LIBCFS_LINUX_CFS_MEM_H__
 
-#ifndef __LIBCFS_LIBCFS_H__
-#error Do not #include this file directly. #include <libcfs/libcfs.h> instead
-#endif
-
-#ifndef __KERNEL__
-#error This include is only for kernel use.
-#endif
-
 #include <linux/mm.h>
 #include <linux/vmalloc.h>
 #include <linux/pagemap.h>
@@ -52,32 +44,61 @@
 #ifdef HAVE_MM_INLINE
 # include <linux/mm_inline.h>
 #endif
+#include <linux/sched.h>
+#ifdef HAVE_SCHED_HEADERS
+#include <linux/sched/mm.h>
+#endif
+
+#ifdef HAVE_TOTALRAM_PAGES_AS_FUNC
+ #ifndef cfs_totalram_pages
+  #define cfs_totalram_pages() totalram_pages()
+ #endif
+#else
+ #ifndef cfs_totalram_pages
+  #define cfs_totalram_pages() totalram_pages
+ #endif
+#endif
+
+#ifndef HAVE_MEMALLOC_RECLAIM
+static inline unsigned int memalloc_noreclaim_save(void)
+{
+       unsigned int flags = current->flags & PF_MEMALLOC;
+
+       current->flags |= PF_MEMALLOC;
+       return flags;
+}
+
+static inline void memalloc_noreclaim_restore(unsigned int flags)
+{
+       current->flags = (current->flags & ~PF_MEMALLOC) | flags;
+}
+#endif /* !HAVE_MEMALLOC_RECLAIM */
+
+#ifndef HAVE_BITMAP_ALLOC
+static inline unsigned long *bitmap_alloc(unsigned int nbits, gfp_t flags)
+{
+       return kmalloc_array(BITS_TO_LONGS(nbits), sizeof(unsigned long),
+                            flags);
+}
+
+static inline unsigned long *bitmap_zalloc(unsigned int nbits, gfp_t flags)
+{
+       return bitmap_alloc(nbits, flags | __GFP_ZERO);
+}
+
+static inline void bitmap_free(const unsigned long *bitmap)
+{
+       kfree(bitmap);
+}
+#endif /* !HAVE_BITMAP_ALLOC */
 
 /*
  * Shrinker
  */
-#ifdef HAVE_SHRINK_CONTROL
 # define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask)  \
                        struct shrinker *shrinker, \
                        struct shrink_control *sc
 # define shrink_param(sc, var) ((sc)->var)
-#else
-struct shrink_control {
-       gfp_t gfp_mask;
-       unsigned long nr_to_scan;
-};
-# ifdef HAVE_SHRINKER_WANT_SHRINK_PTR
-#  define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask)  \
-                        struct shrinker *shrinker, \
-                        int nr_to_scan, gfp_t gfp_mask
-# else
-#  define SHRINKER_ARGS(sc, nr_to_scan, gfp_mask)  \
-                        int nr_to_scan, gfp_t gfp_mask
-# endif
-       /* avoid conflict with spl mm_compat.h */
-# define HAVE_SHRINK_CONTROL_STRUCT 1
-# define shrink_param(sc, var) (var)
-#endif
 
 #ifdef HAVE_SHRINKER_COUNT
 struct shrinker_var {