1 files changed, 356 insertions, 0 deletions

diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
new file mode 100644
index 000000000000..e96fe9062500
--- /dev/null
+++ b/include/linux/nodemask.h
@@ -0,0 +1,356 @@
+#ifndef __LINUX_NODEMASK_H
+#define __LINUX_NODEMASK_H
+
+/*
+ * Nodemasks provide a bitmap suitable for representing the
+ * set of Node's in a system, one bit position per Node number.
+ *
+ * See detailed comments in the file linux/bitmap.h describing the
+ * data type on which these nodemasks are based.
+ *
+ * For details of nodemask_scnprintf() and nodemask_parse(),
+ * see bitmap_scnprintf() and bitmap_parse() in lib/bitmap.c.
+ * For details of nodelist_scnprintf() and nodelist_parse(), see
+ * bitmap_scnlistprintf() and bitmap_parselist(), also in bitmap.c.
+ *
+ * The available nodemask operations are:
+ *
+ * void node_set(node, mask)            turn on bit 'node' in mask
+ * void node_clear(node, mask)          turn off bit 'node' in mask
+ * void nodes_setall(mask)              set all bits
+ * void nodes_clear(mask)               clear all bits
+ * int node_isset(node, mask)           true iff bit 'node' set in mask
+ * int node_test_and_set(node, mask)    test and set bit 'node' in mask
+ *
+ * void nodes_and(dst, src1, src2)      dst = src1 & src2  [intersection]
+ * void nodes_or(dst, src1, src2)       dst = src1 | src2  [union]
+ * void nodes_xor(dst, src1, src2)      dst = src1 ^ src2
+ * void nodes_andnot(dst, src1, src2)   dst = src1 & ~src2
+ * void nodes_complement(dst, src)      dst = ~src
+ *
+ * int nodes_equal(mask1, mask2)        Does mask1 == mask2?
+ * int nodes_intersects(mask1, mask2)   Do mask1 and mask2 intersect?
+ * int nodes_subset(mask1, mask2)       Is mask1 a subset of mask2?
+ * int nodes_empty(mask)                Is mask empty (no bits sets)?
+ * int nodes_full(mask)                 Is mask full (all bits sets)?
+ * int nodes_weight(mask)               Hamming weight - number of set bits
+ *
+ * void nodes_shift_right(dst, src, n)  Shift right
+ * void nodes_shift_left(dst, src, n)   Shift left
+ *
+ * int first_node(mask)                 Number lowest set bit, or MAX_NUMNODES
+ * int next_node(node, mask)            Next node past 'node', or MAX_NUMNODES
+ * int first_unset_node(mask)           First node not set in mask, or 
+ *                                      MAX_NUMNODES.
+ *
+ * nodemask_t nodemask_of_node(node)    Return nodemask with bit 'node' set
+ * NODE_MASK_ALL                        Initializer - all bits set
+ * NODE_MASK_NONE                       Initializer - no bits set
+ * unsigned long *nodes_addr(mask)      Array of unsigned long's in mask
+ *
+ * int nodemask_scnprintf(buf, len, mask) Format nodemask for printing
+ * int nodemask_parse(ubuf, ulen, mask) Parse ascii string as nodemask
+ * int nodelist_scnprintf(buf, len, mask) Format nodemask as list for printing
+ * int nodelist_parse(buf, map)         Parse ascii string as nodelist
+ *
+ * for_each_node_mask(node, mask)       for-loop node over mask
+ *
+ * int num_online_nodes()               Number of online Nodes
+ * int num_possible_nodes()             Number of all possible Nodes
+ *
+ * int node_online(node)                Is some node online?
+ * int node_possible(node)              Is some node possible?
+ *
+ * int any_online_node(mask)            First online node in mask
+ *
+ * node_set_online(node)                set bit 'node' in node_online_map
+ * node_set_offline(node)               clear bit 'node' in node_online_map
+ *
+ * for_each_node(node)                  for-loop node over node_possible_map
+ * for_each_online_node(node)           for-loop node over node_online_map
+ *
+ * Subtlety:
+ * 1) The 'type-checked' form of node_isset() causes gcc (3.3.2, anyway)
+ *    to generate slightly worse code.  So use a simple one-line #define
+ *    for node_isset(), instead of wrapping an inline inside a macro, the
+ *    way we do the other calls.
+ */
+
+#include <linux/kernel.h>
+#include <linux/threads.h>
+#include <linux/bitmap.h>
+#include <linux/numa.h>
+#include <asm/bug.h>
+
+typedef struct { DECLARE_BITMAP(bits, MAX_NUMNODES); } nodemask_t;
+extern nodemask_t _unused_nodemask_arg_;
+
+#define node_set(node, dst) __node_set((node), &(dst))
+static inline void __node_set(int node, volatile nodemask_t *dstp)
+{
+        set_bit(node, dstp->bits);
+}
+
+#define node_clear(node, dst) __node_clear((node), &(dst))
+static inline void __node_clear(int node, volatile nodemask_t *dstp)
+{
+        clear_bit(node, dstp->bits);
+}
+
+#define nodes_setall(dst) __nodes_setall(&(dst), MAX_NUMNODES)
+static inline void __nodes_setall(nodemask_t *dstp, int nbits)
+{
+        bitmap_fill(dstp->bits, nbits);
+}
+
+#define nodes_clear(dst) __nodes_clear(&(dst), MAX_NUMNODES)
+static inline void __nodes_clear(nodemask_t *dstp, int nbits)
+{
+        bitmap_zero(dstp->bits, nbits);
+}
+
+/* No static inline type checking - see Subtlety (1) above. */
+#define node_isset(node, nodemask) test_bit((node), (nodemask).bits)
+
+#define node_test_and_set(node, nodemask) \
+                        __node_test_and_set((node), &(nodemask))
+static inline int __node_test_and_set(int node, nodemask_t *addr)
+{
+        return test_and_set_bit(node, addr->bits);
+}
+
+#define nodes_and(dst, src1, src2) \
+                        __nodes_and(&(dst), &(src1), &(src2), MAX_NUMNODES)
+static inline void __nodes_and(nodemask_t *dstp, const nodemask_t *src1p,
+                                        const nodemask_t *src2p, int nbits)
+{
+        bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits);
+}
+
+#define nodes_or(dst, src1, src2) \
+                        __nodes_or(&(dst), &(src1), &(src2), MAX_NUMNODES)
+static inline void __nodes_or(nodemask_t *dstp, const nodemask_t *src1p,
+                                        const nodemask_t *src2p, int nbits)
+{
+        bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits);
+}
+
+#define nodes_xor(dst, src1, src2) \
+                        __nodes_xor(&(dst), &(src1), &(src2), MAX_NUMNODES)
+static inline void __nodes_xor(nodemask_t *dstp, const nodemask_t *src1p,
+                                        const nodemask_t *src2p, int nbits)
+{
+        bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits);
+}
+
+#define nodes_andnot(dst, src1, src2) \
+                        __nodes_andnot(&(dst), &(src1), &(src2), MAX_NUMNODES)
+static inline void __nodes_andnot(nodemask_t *dstp, const nodemask_t *src1p,
+                                        const nodemask_t *src2p, int nbits)
+{
+        bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits);
+}
+
+#define nodes_complement(dst, src) \
+                        __nodes_complement(&(dst), &(src), MAX_NUMNODES)
+static inline void __nodes_complement(nodemask_t *dstp,
+                                        const nodemask_t *srcp, int nbits)
+{
+        bitmap_complement(dstp->bits, srcp->bits, nbits);
+}
+
+#define nodes_equal(src1, src2) \
+                        __nodes_equal(&(src1), &(src2), MAX_NUMNODES)
+static inline int __nodes_equal(const nodemask_t *src1p,
+                                        const nodemask_t *src2p, int nbits)
+{
+        return bitmap_equal(src1p->bits, src2p->bits, nbits);
+}
+
+#define nodes_intersects(src1, src2) \
+                        __nodes_intersects(&(src1), &(src2), MAX_NUMNODES)
+static inline int __nodes_intersects(const nodemask_t *src1p,
+                                        const nodemask_t *src2p, int nbits)
+{
+        return bitmap_intersects(src1p->bits, src2p->bits, nbits);
+}
+
+#define nodes_subset(src1, src2) \
+                        __nodes_subset(&(src1), &(src2), MAX_NUMNODES)
+static inline int __nodes_subset(const nodemask_t *src1p,
+                                        const nodemask_t *src2p, int nbits)
+{
+        return bitmap_subset(src1p->bits, src2p->bits, nbits);
+}
+
+#define nodes_empty(src) __nodes_empty(&(src), MAX_NUMNODES)
+static inline int __nodes_empty(const nodemask_t *srcp, int nbits)
+{
+        return bitmap_empty(srcp->bits, nbits);
+}
+
+#define nodes_full(nodemask) __nodes_full(&(nodemask), MAX_NUMNODES)
+static inline int __nodes_full(const nodemask_t *srcp, int nbits)
+{
+        return bitmap_full(srcp->bits, nbits);
+}
+
+#define nodes_weight(nodemask) __nodes_weight(&(nodemask), MAX_NUMNODES)
+static inline int __nodes_weight(const nodemask_t *srcp, int nbits)
+{
+        return bitmap_weight(srcp->bits, nbits);
+}
+
+#define nodes_shift_right(dst, src, n) \
+                        __nodes_shift_right(&(dst), &(src), (n), MAX_NUMNODES)
+static inline void __nodes_shift_right(nodemask_t *dstp,
+                                        const nodemask_t *srcp, int n, int nbits)
+{
+        bitmap_shift_right(dstp->bits, srcp->bits, n, nbits);
+}
+
+#define nodes_shift_left(dst, src, n) \
+                        __nodes_shift_left(&(dst), &(src), (n), MAX_NUMNODES)
+static inline void __nodes_shift_left(nodemask_t *dstp,
+                                        const nodemask_t *srcp, int n, int nbits)
+{
+        bitmap_shift_left(dstp->bits, srcp->bits, n, nbits);
+}
+
+/* FIXME: better would be to fix all architectures to never return
+          > MAX_NUMNODES, then the silly min_ts could be dropped. */
+
+#define first_node(src) __first_node(&(src))
+static inline int __first_node(const nodemask_t *srcp)
+{
+        return min_t(int, MAX_NUMNODES, find_first_bit(srcp->bits, MAX_NUMNODES));
+}
+
+#define next_node(n, src) __next_node((n), &(src))
+static inline int __next_node(int n, const nodemask_t *srcp)
+{
+        return min_t(int,MAX_NUMNODES,find_next_bit(srcp->bits, MAX_NUMNODES, n+1));
+}
+
+#define nodemask_of_node(node)                                          \
+({                                                                      \
+        typeof(_unused_nodemask_arg_) m;                                \
+        if (sizeof(m) == sizeof(unsigned long)) {                       \
+                m.bits[0] = 1UL<<(node);                                \
+        } else {                                                        \
+                nodes_clear(m);                                         \
+                node_set((node), m);                                    \
+        }                                                               \
+        m;                                                              \
+})
+
+#define first_unset_node(mask) __first_unset_node(&(mask))
+static inline int __first_unset_node(const nodemask_t *maskp)
+{
+        return min_t(int,MAX_NUMNODES,
+                        find_first_zero_bit(maskp->bits, MAX_NUMNODES));
+}
+
+#define NODE_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(MAX_NUMNODES)
+
+#if MAX_NUMNODES <= BITS_PER_LONG
+
+#define NODE_MASK_ALL                                                   \
+((nodemask_t) { {                                                       \
+        [BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD           \
+} })
+
+#else
+
+#define NODE_MASK_ALL                                                   \
+((nodemask_t) { {                                                       \
+        [0 ... BITS_TO_LONGS(MAX_NUMNODES)-2] = ~0UL,                   \
+        [BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD           \
+} })
+
+#endif
+
+#define NODE_MASK_NONE                                                  \
+((nodemask_t) { {                                                       \
+        [0 ... BITS_TO_LONGS(MAX_NUMNODES)-1] =  0UL                    \
+} })
+
+#define nodes_addr(src) ((src).bits)
+
+#define nodemask_scnprintf(buf, len, src) \
+                        __nodemask_scnprintf((buf), (len), &(src), MAX_NUMNODES)
+static inline int __nodemask_scnprintf(char *buf, int len,
+                                        const nodemask_t *srcp, int nbits)
+{
+        return bitmap_scnprintf(buf, len, srcp->bits, nbits);
+}
+
+#define nodemask_parse(ubuf, ulen, dst) \
+                        __nodemask_parse((ubuf), (ulen), &(dst), MAX_NUMNODES)
+static inline int __nodemask_parse(const char __user *buf, int len,
+                                        nodemask_t *dstp, int nbits)
+{
+        return bitmap_parse(buf, len, dstp->bits, nbits);
+}
+
+#define nodelist_scnprintf(buf, len, src) \
+                        __nodelist_scnprintf((buf), (len), &(src), MAX_NUMNODES)
+static inline int __nodelist_scnprintf(char *buf, int len,
+                                        const nodemask_t *srcp, int nbits)
+{
+        return bitmap_scnlistprintf(buf, len, srcp->bits, nbits);
+}
+
+#define nodelist_parse(buf, dst) __nodelist_parse((buf), &(dst), MAX_NUMNODES)
+static inline int __nodelist_parse(const char *buf, nodemask_t *dstp, int nbits)
+{
+        return bitmap_parselist(buf, dstp->bits, nbits);
+}
+
+#if MAX_NUMNODES > 1
+#define for_each_node_mask(node, mask)                  \
+        for ((node) = first_node(mask);                 \
+                (node) < MAX_NUMNODES;                  \
+                (node) = next_node((node), (mask)))
+#else /* MAX_NUMNODES == 1 */
+#define for_each_node_mask(node, mask)                  \
+        if (!nodes_empty(mask))                         \
+                for ((node) = 0; (node) < 1; (node)++)
+#endif /* MAX_NUMNODES */
+
+/*
+ * The following particular system nodemasks and operations
+ * on them manage all possible and online nodes.
+ */
+
+extern nodemask_t node_online_map;
+extern nodemask_t node_possible_map;
+
+#if MAX_NUMNODES > 1
+#define num_online_nodes()      nodes_weight(node_online_map)
+#define num_possible_nodes()    nodes_weight(node_possible_map)
+#define node_online(node)       node_isset((node), node_online_map)
+#define node_possible(node)     node_isset((node), node_possible_map)
+#else
+#define num_online_nodes()      1
+#define num_possible_nodes()    1
+#define node_online(node)       ((node) == 0)
+#define node_possible(node)     ((node) == 0)
+#endif
+
+#define any_online_node(mask)                   \
+({                                              \
+        int node;                               \
+        for_each_node_mask(node, (mask))        \
+                if (node_online(node))          \
+                        break;                  \
+        node;                                   \
+})
+
+#define node_set_online(node)      set_bit((node), node_online_map.bits)
+#define node_set_offline(node)     clear_bit((node), node_online_map.bits)
+
+#define for_each_node(node)        for_each_node_mask((node), node_possible_map)
+#define for_each_online_node(node) for_each_node_mask((node), node_online_map)
+
+#endif /* __LINUX_NODEMASK_H */