Merge branch 'kallsyms'

include/linux/kallsyms_compat.h

@@ -0,0 +1,17 @@
+#ifndef _SPL_KALLSYMS_COMPAT_H
+#define _SPL_KALLSYMS_COMPAT_H
+
+#ifdef HAVE_KALLSYMS_LOOKUP_NAME
+
+#include <linux/kallsyms.h>
+#define spl_kallsyms_lookup_name(name) kallsyms_lookup_name(name)
+
+#else
+
+typedef unsigned long (*kallsyms_lookup_name_t)(const char *);
+extern kallsyms_lookup_name_t spl_kallsyms_lookup_name_fn;
+#define spl_kallsyms_lookup_name(name) spl_kallsyms_lookup_name_fn(name)
+
+#endif /* HAVE_KALLSYMS_LOOKUP_NAME */
+
+#endif /* _SPL_KALLSYMS_COMPAT_H */

include/sys/kmem.h

@@ -325,6 +325,7 @@ extern void spl_kmem_cache_free(spl_kmem_cache_t *skc, void *obj);
 extern void spl_kmem_cache_reap_now(spl_kmem_cache_t *skc);
 extern void spl_kmem_reap(void);
 
+int spl_kmem_init_kallsyms_lookup(void);
 int spl_kmem_init(void);
 void spl_kmem_fini(void);
 

include/sys/types.h

@@ -16,6 +16,7 @@ extern "C" {
 #include <linux/bitops_compat.h>
 #include <linux/smp_compat.h>
 #include <linux/workqueue_compat.h>
+#include <linux/kallsyms_compat.h>
 
 #ifndef HAVE_UINTPTR_T
 typedef unsigned long			uintptr_t;

include/sys/vmsystm.h

@@ -57,12 +57,71 @@ extern vmem_t *heap_arena;		/* primary kernel heap arena */
 extern vmem_t *zio_alloc_arena;		/* arena for zio caches */
 extern vmem_t *zio_arena;		/* arena for allocating zio memory */
 
-#define VMEM_ALLOC			0x01
-#define VMEM_FREE			0x02
-
 extern pgcnt_t spl_kmem_availrmem(void);
 extern size_t vmem_size(vmem_t *vmp, int typemask);
 
+/*
+ * The following symbols are available for use within the kernel
+ * itself, and they used to be available in older kernels.  But it
+ * looks like they have been removed perhaps due to lack of use.
+ * For our purposes we need them to access the global memory state
+ * of the system, which is even available to user space process
+ * in /proc/meminfo.  It's odd to me that there is no kernel API
+ * to get the same information, minimally the proc handler for
+ * the above mentioned /proc/meminfo file would make use of it.
+ */
+
+/* Source linux/fs/proc/mmu.c */
+#ifndef HAVE_GET_VMALLOC_INFO
+#ifdef CONFIG_MMU
+
+struct vmalloc_info {
+	unsigned long used;
+	unsigned long largest_chunk;
+};
+
+typedef void (*get_vmalloc_info_t)(struct vmalloc_info *);
+extern get_vmalloc_info_t get_vmalloc_info_fn;
+
+# define VMEM_ALLOC		0x01
+# define VMEM_FREE		0x02
+# define VMALLOC_TOTAL		(VMALLOC_END - VMALLOC_START)
+# define get_vmalloc_info(vmi)	get_vmalloc_info_fn(vmi)
+#else
+# error "CONFIG_MMU must be defined"
+#endif /* CONFIG_MMU */
+#endif /* HAVE_GET_VMALLOC_INFO */
+
+/* Source linux/mm/mmzone.c */
+#ifndef HAVE_FIRST_ONLINE_PGDAT
+typedef struct pglist_data *(*first_online_pgdat_t)(void);
+extern first_online_pgdat_t first_online_pgdat_fn;
+#define first_online_pgdat()	first_online_pgdat_fn()
+#endif /* HAVE_FIRST_ONLINE_PGDAT */
+
+/* Source linux/mm/mmzone.c */
+#ifndef HAVE_NEXT_ONLINE_PGDAT
+typedef struct pglist_data *(*next_online_pgdat_t)(struct pglist_data *);
+extern next_online_pgdat_t next_online_pgdat_fn;
+#define next_online_pgdat(pgd)	next_online_pgdat_fn(pgd)
+#endif /* HAVE_NEXT_ONLINE_PGDAT */
+
+/* Source linux/mm/mmzone.c */
+#ifndef HAVE_NEXT_ZONE
+typedef struct zone *(*next_zone_t)(struct zone *);
+extern next_zone_t next_zone_fn;
+#define next_zone(zone)		next_zone_fn(zone)
+#endif /* HAVE_NEXT_ZONE */
+
+/* Source linux/mm/vmstat.c */
+#ifndef HAVE_GET_ZONE_COUNTS
+typedef void (*get_zone_counts_t)(unsigned long *, unsigned long *,
+				  unsigned long *);
+extern get_zone_counts_t get_zone_counts_fn;
+#define get_zone_counts(a,i,f)	get_zone_counts_fn(a,i,f)
+#endif /* HAVE_GET_ZONE_COUNTS */
+
+
 #define xcopyin(from, to, size)		copy_from_user(to, from, size)
 #define xcopyout(from, to, size)	copy_to_user(to, from, size)