Commit 35926ff5 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Revert "cpusets: randomize node rotor used in cpuset_mem_spread_node()" 



This reverts commit 0ac0c0d0, which
caused cross-architecture build problems for all the wrong reasons.
IA64 already added its own version of __node_random(), but the fact is,
there is nothing architectural about the function, and the original
commit was just badly done. Revert it, since no fix is forthcoming.

Requested-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b612a055

arch/x86/mm/numa.c

+0 −17
Original line number Diff line number Diff line
@@ -2,7 +2,6 @@ 
#include <linux/topology.h>

#include <linux/module.h>

#include <linux/bootmem.h>

#include <linux/random.h>



#ifdef CONFIG_DEBUG_PER_CPU_MAPS

# define DBG(x...) printk(KERN_DEBUG x)
@@ -66,19 +65,3 @@ const struct cpumask *cpumask_of_node(int node) 
}

EXPORT_SYMBOL(cpumask_of_node);

#endif
 


/*

 * Return the bit number of a random bit set in the nodemask.

 *   (returns -1 if nodemask is empty)

 */

int __node_random(const nodemask_t *maskp)

{

	int w, bit = -1;



	w = nodes_weight(*maskp);

	if (w)

		bit = bitmap_ord_to_pos(maskp->bits,

			get_random_int() % w, MAX_NUMNODES);

	return bit;

}

EXPORT_SYMBOL(__node_random);

include/linux/bitmap.h

+0 −1
Original line number Diff line number Diff line
@@ -141,7 +141,6 @@ extern int bitmap_find_free_region(unsigned long *bitmap, int bits, int order); 
extern void bitmap_release_region(unsigned long *bitmap, int pos, int order);

extern int bitmap_allocate_region(unsigned long *bitmap, int pos, int order);

extern void bitmap_copy_le(void *dst, const unsigned long *src, int nbits);

extern int bitmap_ord_to_pos(const unsigned long *bitmap, int n, int bits);



#define BITMAP_LAST_WORD_MASK(nbits)					\

(									\

include/linux/nodemask.h

+0 −8
Original line number Diff line number Diff line
@@ -66,8 +66,6 @@ 
 * int num_online_nodes()		Number of online Nodes

 * int num_possible_nodes()		Number of all possible Nodes

 *

 * int node_random(mask)		Random node with set bit in mask

 *

 * int node_online(node)		Is some node online?

 * int node_possible(node)		Is some node possible?

 *
@@ -432,10 +430,6 @@ static inline void node_set_offline(int nid) 
	node_clear_state(nid, N_ONLINE);

	nr_online_nodes = num_node_state(N_ONLINE);

}



#define node_random(mask) __node_random(&(mask))

extern int __node_random(const nodemask_t *maskp);



#else



static inline int node_state(int node, enum node_states state)
@@ -466,8 +460,6 @@ static inline int num_node_state(enum node_states state) 


#define node_set_online(node)	   node_set_state((node), N_ONLINE)

#define node_set_offline(node)	   node_clear_state((node), N_ONLINE)



static inline int node_random(const nodemask_t mask) { return 0; }

#endif



#define node_online_map 	node_states[N_ONLINE]

kernel/fork.c

+0 −4
Original line number Diff line number Diff line
@@ -1086,10 +1086,6 @@ static struct task_struct *copy_process(unsigned long clone_flags, 
 	}

	mpol_fix_fork_child_flag(p);

#endif

#ifdef CONFIG_CPUSETS

	p->cpuset_mem_spread_rotor = node_random(p->mems_allowed);

	p->cpuset_slab_spread_rotor = node_random(p->mems_allowed);

#endif

#ifdef CONFIG_TRACE_IRQFLAGS

	p->irq_events = 0;

#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW

lib/bitmap.c

+1 −1
Original line number Diff line number Diff line
@@ -672,7 +672,7 @@ static int bitmap_pos_to_ord(const unsigned long *buf, int pos, int bits) 
 *

 * The bit positions 0 through @bits are valid positions in @buf.

 */

int bitmap_ord_to_pos(const unsigned long *buf, int ord, int bits)

static int bitmap_ord_to_pos(const unsigned long *buf, int ord, int bits)

{

	int pos = 0;

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