aboutsummaryrefslogtreecommitdiffstats
path: root/kernel/cpu.c
diff options
context:
space:
mode:
authorRusty Russell <rusty@rustcorp.com.au>2008-12-13 05:49:41 -0500
committerRusty Russell <rusty@rustcorp.com.au>2008-12-13 05:49:41 -0500
commit98a79d6a50181ca1ecf7400eda01d5dc1bc0dbf0 (patch)
treee8829ee975b77745da153b9d23601e3a1497ad68 /kernel/cpu.c
parent6c34bc2976b30dc8b56392c020e25bae1f363cab (diff)
cpumask: centralize cpu_online_map and cpu_possible_map
Impact: cleanup Each SMP arch defines these themselves. Move them to a central location. Twists: 1) Some archs (m32, parisc, s390) set possible_map to all 1, so we add a CONFIG_INIT_ALL_POSSIBLE for this rather than break them. 2) mips and sparc32 '#define cpu_possible_map phys_cpu_present_map'. Those archs simply have phys_cpu_present_map replaced everywhere. 3) Alpha defined cpu_possible_map to cpu_present_map; this is tricky so I just manipulate them both in sync. 4) IA64, cris and m32r have gratuitous 'extern cpumask_t cpu_possible_map' declarations. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Reviewed-by: Grant Grundler <grundler@parisc-linux.org> Tested-by: Tony Luck <tony.luck@intel.com> Acked-by: Ingo Molnar <mingo@elte.hu> Cc: Mike Travis <travis@sgi.com> Cc: ink@jurassic.park.msu.ru Cc: rmk@arm.linux.org.uk Cc: starvik@axis.com Cc: tony.luck@intel.com Cc: takata@linux-m32r.org Cc: ralf@linux-mips.org Cc: grundler@parisc-linux.org Cc: paulus@samba.org Cc: schwidefsky@de.ibm.com Cc: lethal@linux-sh.org Cc: wli@holomorphy.com Cc: davem@davemloft.net Cc: jdike@addtoit.com Cc: mingo@redhat.com
Diffstat (limited to 'kernel/cpu.c')
-rw-r--r--kernel/cpu.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 8ea32e8d68b0..bae131a1211b 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -24,19 +24,20 @@
24cpumask_t cpu_present_map __read_mostly; 24cpumask_t cpu_present_map __read_mostly;
25EXPORT_SYMBOL(cpu_present_map); 25EXPORT_SYMBOL(cpu_present_map);
26 26
27#ifndef CONFIG_SMP
28
29/* 27/*
30 * Represents all cpu's that are currently online. 28 * Represents all cpu's that are currently online.
31 */ 29 */
32cpumask_t cpu_online_map __read_mostly = CPU_MASK_ALL; 30cpumask_t cpu_online_map __read_mostly;
33EXPORT_SYMBOL(cpu_online_map); 31EXPORT_SYMBOL(cpu_online_map);
34 32
33#ifdef CONFIG_INIT_ALL_POSSIBLE
35cpumask_t cpu_possible_map __read_mostly = CPU_MASK_ALL; 34cpumask_t cpu_possible_map __read_mostly = CPU_MASK_ALL;
35#else
36cpumask_t cpu_possible_map __read_mostly;
37#endif
36EXPORT_SYMBOL(cpu_possible_map); 38EXPORT_SYMBOL(cpu_possible_map);
37 39
38#else /* CONFIG_SMP */ 40#ifdef CONFIG_SMP
39
40/* Serializes the updates to cpu_online_map, cpu_present_map */ 41/* Serializes the updates to cpu_online_map, cpu_present_map */
41static DEFINE_MUTEX(cpu_add_remove_lock); 42static DEFINE_MUTEX(cpu_add_remove_lock);
42 43