ARM: mmp: fix potential NULL dereference
[linux/fpc-iii.git] / arch / x86 / kernel / apic / ipi.c
blobcce91bf26676cddee4b5c42fa21016a801411079
1 #include <linux/cpumask.h>
2 #include <linux/interrupt.h>
3 #include <linux/init.h>
5 #include <linux/mm.h>
6 #include <linux/delay.h>
7 #include <linux/spinlock.h>
8 #include <linux/kernel_stat.h>
9 #include <linux/mc146818rtc.h>
10 #include <linux/cache.h>
11 #include <linux/cpu.h>
12 #include <linux/module.h>
14 #include <asm/smp.h>
15 #include <asm/mtrr.h>
16 #include <asm/tlbflush.h>
17 #include <asm/mmu_context.h>
18 #include <asm/apic.h>
19 #include <asm/proto.h>
20 #include <asm/ipi.h>
22 void default_send_IPI_mask_sequence_phys(const struct cpumask *mask, int vector)
24 unsigned long query_cpu;
25 unsigned long flags;
28 * Hack. The clustered APIC addressing mode doesn't allow us to send
29 * to an arbitrary mask, so I do a unicast to each CPU instead.
30 * - mbligh
32 local_irq_save(flags);
33 for_each_cpu(query_cpu, mask) {
34 __default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
35 query_cpu), vector, APIC_DEST_PHYSICAL);
37 local_irq_restore(flags);
40 void default_send_IPI_mask_allbutself_phys(const struct cpumask *mask,
41 int vector)
43 unsigned int this_cpu = smp_processor_id();
44 unsigned int query_cpu;
45 unsigned long flags;
47 /* See Hack comment above */
49 local_irq_save(flags);
50 for_each_cpu(query_cpu, mask) {
51 if (query_cpu == this_cpu)
52 continue;
53 __default_send_IPI_dest_field(per_cpu(x86_cpu_to_apicid,
54 query_cpu), vector, APIC_DEST_PHYSICAL);
56 local_irq_restore(flags);
59 #ifdef CONFIG_X86_32
61 void default_send_IPI_mask_sequence_logical(const struct cpumask *mask,
62 int vector)
64 unsigned long flags;
65 unsigned int query_cpu;
68 * Hack. The clustered APIC addressing mode doesn't allow us to send
69 * to an arbitrary mask, so I do a unicasts to each CPU instead. This
70 * should be modified to do 1 message per cluster ID - mbligh
73 local_irq_save(flags);
74 for_each_cpu(query_cpu, mask)
75 __default_send_IPI_dest_field(
76 early_per_cpu(x86_cpu_to_logical_apicid, query_cpu),
77 vector, apic->dest_logical);
78 local_irq_restore(flags);
81 void default_send_IPI_mask_allbutself_logical(const struct cpumask *mask,
82 int vector)
84 unsigned long flags;
85 unsigned int query_cpu;
86 unsigned int this_cpu = smp_processor_id();
88 /* See Hack comment above */
90 local_irq_save(flags);
91 for_each_cpu(query_cpu, mask) {
92 if (query_cpu == this_cpu)
93 continue;
94 __default_send_IPI_dest_field(
95 early_per_cpu(x86_cpu_to_logical_apicid, query_cpu),
96 vector, apic->dest_logical);
98 local_irq_restore(flags);
102 * This is only used on smaller machines.
104 void default_send_IPI_mask_logical(const struct cpumask *cpumask, int vector)
106 unsigned long mask = cpumask_bits(cpumask)[0];
107 unsigned long flags;
109 if (WARN_ONCE(!mask, "empty IPI mask"))
110 return;
112 local_irq_save(flags);
113 WARN_ON(mask & ~cpumask_bits(cpu_online_mask)[0]);
114 __default_send_IPI_dest_field(mask, vector, apic->dest_logical);
115 local_irq_restore(flags);
118 void default_send_IPI_allbutself(int vector)
121 * if there are no other CPUs in the system then we get an APIC send
122 * error if we try to broadcast, thus avoid sending IPIs in this case.
124 if (!(num_online_cpus() > 1))
125 return;
127 __default_local_send_IPI_allbutself(vector);
130 void default_send_IPI_all(int vector)
132 __default_local_send_IPI_all(vector);
135 void default_send_IPI_self(int vector)
137 __default_send_IPI_shortcut(APIC_DEST_SELF, vector, apic->dest_logical);
140 /* must come after the send_IPI functions above for inlining */
141 static int convert_apicid_to_cpu(int apic_id)
143 int i;
145 for_each_possible_cpu(i) {
146 if (per_cpu(x86_cpu_to_apicid, i) == apic_id)
147 return i;
149 return -1;
152 int safe_smp_processor_id(void)
154 int apicid, cpuid;
156 if (!cpu_has_apic)
157 return 0;
159 apicid = hard_smp_processor_id();
160 if (apicid == BAD_APICID)
161 return 0;
163 cpuid = convert_apicid_to_cpu(apicid);
165 return cpuid >= 0 ? cpuid : 0;
167 #endif