diff options
Diffstat (limited to 'include/linux/nodemask.h')
| -rw-r--r-- | include/linux/nodemask.h | 47 |
1 files changed, 44 insertions, 3 deletions
diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h index 848025cd708..b359c4a9ec9 100644 --- a/include/linux/nodemask.h +++ b/include/linux/nodemask.h @@ -82,6 +82,12 @@ * 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. + * + * NODEMASK_SCRATCH + * When doing above logical AND, OR, XOR, Remap operations the callers tend to + * need temporary nodemask_t's on the stack. But if NODES_SHIFT is large, + * nodemask_t's consume too much stack space. NODEMASK_SCRATCH is a helper + * for such situations. See below and CPUMASK_ALLOC also. */ #include <linux/kernel.h> @@ -408,6 +414,19 @@ static inline int num_node_state(enum node_states state) #define next_online_node(nid) next_node((nid), node_states[N_ONLINE]) extern int nr_node_ids; +extern int nr_online_nodes; + +static inline void node_set_online(int nid) +{ + node_set_state(nid, N_ONLINE); + nr_online_nodes = num_node_state(N_ONLINE); +} + +static inline void node_set_offline(int nid) +{ + node_clear_state(nid, N_ONLINE); + nr_online_nodes = num_node_state(N_ONLINE); +} #else static inline int node_state(int node, enum node_states state) @@ -434,7 +453,10 @@ static inline int num_node_state(enum node_states state) #define first_online_node 0 #define next_online_node(nid) (MAX_NUMNODES) #define nr_node_ids 1 +#define nr_online_nodes 1 +#define node_set_online(node) node_set_state((node), N_ONLINE) +#define node_set_offline(node) node_clear_state((node), N_ONLINE) #endif #define node_online_map node_states[N_ONLINE] @@ -454,10 +476,29 @@ static inline int num_node_state(enum node_states state) #define node_online(node) node_state((node), N_ONLINE) #define node_possible(node) node_state((node), N_POSSIBLE) -#define node_set_online(node) node_set_state((node), N_ONLINE) -#define node_set_offline(node) node_clear_state((node), N_ONLINE) - #define for_each_node(node) for_each_node_state(node, N_POSSIBLE) #define for_each_online_node(node) for_each_node_state(node, N_ONLINE) +/* + * For nodemask scrach area.(See CPUMASK_ALLOC() in cpumask.h) + */ + +#if NODES_SHIFT > 8 /* nodemask_t > 64 bytes */ +#define NODEMASK_ALLOC(x, m) struct x *m = kmalloc(sizeof(*m), GFP_KERNEL) +#define NODEMASK_FREE(m) kfree(m) +#else +#define NODEMASK_ALLOC(x, m) struct x _m, *m = &_m +#define NODEMASK_FREE(m) +#endif + +/* A example struture for using NODEMASK_ALLOC, used in mempolicy. */ +struct nodemask_scratch { + nodemask_t mask1; + nodemask_t mask2; +}; + +#define NODEMASK_SCRATCH(x) NODEMASK_ALLOC(nodemask_scratch, x) +#define NODEMASK_SCRATCH_FREE(x) NODEMASK_FREE(x) + + #endif /* __LINUX_NODEMASK_H */ |