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

diff --git a/arch/alpha/include/asm/smp.h b/arch/alpha/include/asm/smp.h
index 544c69af8168b27baf40a32b34f334bad1d106a4..547e90951cec07a92bd31d6b9cf37f293612383e 100644 (file)
--- a/arch/alpha/include/asm/smp.h
+++ b/arch/alpha/include/asm/smp.h
@@ -45,7 +45,6 @@ extern struct cpuinfo_alpha cpu_data[NR_CPUS];
 #define raw_smp_processor_id() (current_thread_info()->cpu)
 
 extern int smp_num_cpus;
-#define cpu_possible_map       cpu_present_map
 
 extern void arch_send_call_function_single_ipi(int cpu);
 extern void arch_send_call_function_ipi(cpumask_t mask);

diff --git a/arch/alpha/kernel/process.c b/arch/alpha/kernel/process.c
index 351407e07e71a715a654936b744e498f2cbfb2e0..f238370c907d9f4c86ecbed9da7332ccf08908c3 100644 (file)
--- a/arch/alpha/kernel/process.c
+++ b/arch/alpha/kernel/process.c
@@ -94,6 +94,7 @@ common_shutdown_1(void *generic_ptr)
                flags |= 0x00040000UL; /* "remain halted" */
                *pflags = flags;
                cpu_clear(cpuid, cpu_present_map);
+               cpu_clear(cpuid, cpu_possible_map);
                halt();
        }
 #endif
@@ -120,6 +121,7 @@ common_shutdown_1(void *generic_ptr)
 #ifdef CONFIG_SMP
        /* Wait for the secondaries to halt. */
        cpu_clear(boot_cpuid, cpu_present_map);
+       cpu_clear(boot_cpuid, cpu_possible_map);
        while (cpus_weight(cpu_present_map))
                barrier();
 #endif

diff --git a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c
index cf7da10097bb29d5f8fb69aaefc9107a3419783a..d953e510f68d71ff417206e98c76dc9c13be45ad 100644 (file)
--- a/arch/alpha/kernel/smp.c
+++ b/arch/alpha/kernel/smp.c
@@ -70,11 +70,6 @@ enum ipi_message_type {
 /* Set to a secondary's cpuid when it comes online.  */
 static int smp_secondary_alive __devinitdata = 0;
 
-/* Which cpus ids came online.  */
-cpumask_t cpu_online_map;
-
-EXPORT_SYMBOL(cpu_online_map);
-
 int smp_num_probed;            /* Internal processor count */
 int smp_num_cpus = 1;          /* Number that came online.  */
 EXPORT_SYMBOL(smp_num_cpus);
@@ -440,6 +435,7 @@ setup_smp(void)
                                ((char *)cpubase + i*hwrpb->processor_size);
                        if ((cpu->flags & 0x1cc) == 0x1cc) {
                                smp_num_probed++;
+                               cpu_set(i, cpu_possible_map);
                                cpu_set(i, cpu_present_map);
                                cpu->pal_revision = boot_cpu_palrev;
                        }
@@ -473,6 +469,7 @@ smp_prepare_cpus(unsigned int max_cpus)
 
        /* Nothing to do on a UP box, or when told not to.  */
        if (smp_num_probed == 1 || max_cpus == 0) {
+               cpu_possible_map = cpumask_of_cpu(boot_cpuid);
                cpu_present_map = cpumask_of_cpu(boot_cpuid);
                printk(KERN_INFO "SMP mode deactivated.\n");
                return;

diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index e42a749a56dd5c85abc823e2666ff7b4683c2da0..bd905c0a73651f85d54fffb25146b50d7d267368 100644 (file)
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -33,16 +33,6 @@
 #include <asm/tlbflush.h>
 #include <asm/ptrace.h>
 
-/*
- * bitmask of present and online CPUs.
- * The present bitmask indicates that the CPU is physically present.
- * The online bitmask indicates that the CPU is up and running.
- */
-cpumask_t cpu_possible_map;
-EXPORT_SYMBOL(cpu_possible_map);
-cpumask_t cpu_online_map;
-EXPORT_SYMBOL(cpu_online_map);
-
 /*
  * as from 2.5, kernels no longer have an init_tasks structure
  * so we need some other way of telling a new secondary core

diff --git a/arch/cris/arch-v32/kernel/smp.c b/arch/cris/arch-v32/kernel/smp.c
index 52e16c6436f9bac0733022622fa252d217b40369..9dac17334640a9cf3eda77c0c0a22b53e817f0a1 100644 (file)
--- a/arch/cris/arch-v32/kernel/smp.c
+++ b/arch/cris/arch-v32/kernel/smp.c
@@ -29,11 +29,7 @@
 spinlock_t cris_atomic_locks[] = { [0 ... LOCK_COUNT - 1] = SPIN_LOCK_UNLOCKED};
 
 /* CPU masks */
-cpumask_t cpu_online_map = CPU_MASK_NONE;
-EXPORT_SYMBOL(cpu_online_map);
 cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
-cpumask_t cpu_possible_map;
-EXPORT_SYMBOL(cpu_possible_map);
 EXPORT_SYMBOL(phys_cpu_present_map);
 
 /* Variables used during SMP boot */

diff --git a/arch/cris/include/asm/smp.h b/arch/cris/include/asm/smp.h
index dba33aba3e95583e815becee7cfecca797d64b9b..c615a06dd757aa46ca2e35b4d141b1834fb4bbc2 100644 (file)
--- a/arch/cris/include/asm/smp.h
+++ b/arch/cris/include/asm/smp.h
@@ -4,7 +4,6 @@
 #include <linux/cpumask.h>
 
 extern cpumask_t phys_cpu_present_map;
-extern cpumask_t cpu_possible_map;
 
 #define raw_smp_processor_id() (current_thread_info()->cpu)
 

diff --git a/arch/ia64/include/asm/smp.h b/arch/ia64/include/asm/smp.h
index 12d96e0cd5134d9d95e01e6714b5b75179dcfcf7..21c402365d0ea7f86bf63cbf0009bb7c7e266642 100644 (file)
--- a/arch/ia64/include/asm/smp.h
+++ b/arch/ia64/include/asm/smp.h
@@ -57,7 +57,6 @@ extern struct smp_boot_data {
 
 extern char no_int_routing __devinitdata;
 
-extern cpumask_t cpu_online_map;
 extern cpumask_t cpu_core_map[NR_CPUS];
 DECLARE_PER_CPU(cpumask_t, cpu_sibling_map);
 extern int smp_num_siblings;

diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index 1dcbb85fc4ee9f05253d5d76b5e8033b39a07cf9..4ede6e571c38344eeca9b1510da75d013d0c0b38 100644 (file)
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -131,12 +131,6 @@ struct task_struct *task_for_booting_cpu;
  */
 DEFINE_PER_CPU(int, cpu_state);
 
-/* Bitmasks of currently online, and possible CPUs */
-cpumask_t cpu_online_map;
-EXPORT_SYMBOL(cpu_online_map);
-cpumask_t cpu_possible_map = CPU_MASK_NONE;
-EXPORT_SYMBOL(cpu_possible_map);
-
 cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned;
 EXPORT_SYMBOL(cpu_core_map);
 DEFINE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map);

diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
index dbaed4a638153bc43c5fa4d6e138039bb5cca8df..17a6dab0931958d66b3d2a5ebae28864d2a2d396 100644 (file)
--- a/arch/m32r/Kconfig
+++ b/arch/m32r/Kconfig
@@ -10,6 +10,7 @@ config M32R
        default y
        select HAVE_IDE
        select HAVE_OPROFILE
+       select INIT_ALL_POSSIBLE
 
 config SBUS
        bool

diff --git a/arch/m32r/kernel/smpboot.c b/arch/m32r/kernel/smpboot.c
index 39cb6da72dcbef3358d04e2b419a150f88c299ba..0f06b3722e960518bc275b1167b6948e5eb35914 100644 (file)
--- a/arch/m32r/kernel/smpboot.c
+++ b/arch/m32r/kernel/smpboot.c
@@ -73,17 +73,11 @@ static unsigned int bsp_phys_id = -1;
 /* Bitmask of physically existing CPUs */
 physid_mask_t phys_cpu_present_map;
 
-/* Bitmask of currently online CPUs */
-cpumask_t cpu_online_map;
-EXPORT_SYMBOL(cpu_online_map);
-
 cpumask_t cpu_bootout_map;
 cpumask_t cpu_bootin_map;
 static cpumask_t cpu_callin_map;
 cpumask_t cpu_callout_map;
 EXPORT_SYMBOL(cpu_callout_map);
-cpumask_t cpu_possible_map = CPU_MASK_ALL;
-EXPORT_SYMBOL(cpu_possible_map);
 
 /* Per CPU bogomips and other parameters */
 struct cpuinfo_m32r cpu_data[NR_CPUS] __cacheline_aligned;

diff --git a/arch/mips/include/asm/smp.h b/arch/mips/include/asm/smp.h
index 0ff5b523ea77d8f6a5b7b2337969e414ce5ddaa8..86557b5d1b3f152932d9fe02744cad4eb4ec6316 100644 (file)
--- a/arch/mips/include/asm/smp.h
+++ b/arch/mips/include/asm/smp.h
@@ -38,9 +38,6 @@ extern int __cpu_logical_map[NR_CPUS];
 #define SMP_RESCHEDULE_YOURSELF        0x1     /* XXX braindead */
 #define SMP_CALL_FUNCTION      0x2
 
-extern cpumask_t phys_cpu_present_map;
-#define cpu_possible_map       phys_cpu_present_map
-
 extern void asmlinkage smp_bootstrap(void);
 
 /*

diff --git a/arch/mips/kernel/smp-cmp.c b/arch/mips/kernel/smp-cmp.c
index ca476c4f62a57d12d839975334662254824a3b2f..6789c1a121206bef4db84babf3f2fadc077f6e04 100644 (file)
--- a/arch/mips/kernel/smp-cmp.c
+++ b/arch/mips/kernel/smp-cmp.c
@@ -226,7 +226,7 @@ void __init cmp_smp_setup(void)
 
        for (i = 1; i < NR_CPUS; i++) {
                if (amon_cpu_avail(i)) {
-                       cpu_set(i, phys_cpu_present_map);
+                       cpu_set(i, cpu_possible_map);
                        __cpu_number_map[i]     = ++ncpu;
                        __cpu_logical_map[ncpu] = i;
                }

diff --git a/arch/mips/kernel/smp-mt.c b/arch/mips/kernel/smp-mt.c
index 87a1816c1f4589cdb90c88896830b16b77b84f58..6f7ee5ac46ee5d5f1544967d3e1f3c94ea1fc7df 100644 (file)
--- a/arch/mips/kernel/smp-mt.c
+++ b/arch/mips/kernel/smp-mt.c
@@ -70,7 +70,7 @@ static unsigned int __init smvp_vpe_init(unsigned int tc, unsigned int mvpconf0,
                write_vpe_c0_vpeconf0(tmp);
 
                /* Record this as available CPU */
-               cpu_set(tc, phys_cpu_present_map);
+               cpu_set(tc, cpu_possible_map);
                __cpu_number_map[tc]    = ++ncpu;
                __cpu_logical_map[ncpu] = tc;
        }

diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index 8bf88faf5afdcb5e7eca6923fa5f4d41f988880e..3da94704f81645027d246cf6aea5be80119eddfa 100644 (file)
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -44,15 +44,10 @@
 #include <asm/mipsmtregs.h>
 #endif /* CONFIG_MIPS_MT_SMTC */
 
-cpumask_t phys_cpu_present_map;                /* Bitmask of available CPUs */
 volatile cpumask_t cpu_callin_map;     /* Bitmask of started secondaries */
-cpumask_t cpu_online_map;              /* Bitmask of currently online CPUs */
 int __cpu_number_map[NR_CPUS];         /* Map physical to logical */
 int __cpu_logical_map[NR_CPUS];                /* Map logical to physical */
 
-EXPORT_SYMBOL(phys_cpu_present_map);
-EXPORT_SYMBOL(cpu_online_map);
-
 extern void cpu_idle(void);
 
 /* Number of TCs (or siblings in Intel speak) per CPU core */
@@ -195,7 +190,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 /* preload SMP state for boot cpu */
 void __devinit smp_prepare_boot_cpu(void)
 {
-       cpu_set(0, phys_cpu_present_map);
+       cpu_set(0, cpu_possible_map);
        cpu_set(0, cpu_online_map);
        cpu_set(0, cpu_callin_map);
 }

diff --git a/arch/mips/kernel/smtc.c b/arch/mips/kernel/smtc.c
index 897fb2b4751c95715af0b798d79db5cf899a5e5d..b6cca01ff82b309e803105c1230957e943c87df8 100644 (file)
--- a/arch/mips/kernel/smtc.c
+++ b/arch/mips/kernel/smtc.c
@@ -290,7 +290,7 @@ static void smtc_configure_tlb(void)
  * possibly leave some TCs/VPEs as "slave" processors.
  *
  * Use c0_MVPConf0 to find out how many TCs are available, setting up
- * phys_cpu_present_map and the logical/physical mappings.
+ * cpu_possible_map and the logical/physical mappings.
  */
 
 int __init smtc_build_cpu_map(int start_cpu_slot)
@@ -304,7 +304,7 @@ int __init smtc_build_cpu_map(int start_cpu_slot)
         */
        ntcs = ((read_c0_mvpconf0() & MVPCONF0_PTC) >> MVPCONF0_PTC_SHIFT) + 1;
        for (i=start_cpu_slot; i<NR_CPUS && i<ntcs; i++) {
-               cpu_set(i, phys_cpu_present_map);
+               cpu_set(i, cpu_possible_map);
                __cpu_number_map[i] = i;
                __cpu_logical_map[i] = i;
        }
@@ -521,7 +521,7 @@ void smtc_prepare_cpus(int cpus)
         * Pull any physically present but unused TCs out of circulation.
         */
        while (tc < (((val & MVPCONF0_PTC) >> MVPCONF0_PTC_SHIFT) + 1)) {
-               cpu_clear(tc, phys_cpu_present_map);
+               cpu_clear(tc, cpu_possible_map);
                cpu_clear(tc, cpu_present_map);
                tc++;
        }

diff --git a/arch/mips/pmc-sierra/yosemite/smp.c b/arch/mips/pmc-sierra/yosemite/smp.c
index 3a7df647ca7739b9336cc22ade77c34d883d5252..f78c29b68d77015e114195154c76671e2ce7d1a6 100644 (file)
--- a/arch/mips/pmc-sierra/yosemite/smp.c
+++ b/arch/mips/pmc-sierra/yosemite/smp.c
@@ -141,7 +141,7 @@ static void __cpuinit yos_boot_secondary(int cpu, struct task_struct *idle)
 }
 
 /*
- * Detect available CPUs, populate phys_cpu_present_map before smp_init
+ * Detect available CPUs, populate cpu_possible_map before smp_init
  *
  * We don't want to start the secondary CPU yet nor do we have a nice probing
  * feature in PMON so we just assume presence of the secondary core.
@@ -150,10 +150,10 @@ static void __init yos_smp_setup(void)
 {
        int i;
 
-       cpus_clear(phys_cpu_present_map);
+       cpus_clear(cpu_possible_map);
 
        for (i = 0; i < 2; i++) {
-               cpu_set(i, phys_cpu_present_map);
+               cpu_set(i, cpu_possible_map);
                __cpu_number_map[i]     = i;
                __cpu_logical_map[i]    = i;
        }

diff --git a/arch/mips/sgi-ip27/ip27-smp.c b/arch/mips/sgi-ip27/ip27-smp.c
index ba5cdebeaf0d23d703ce93a163cdd1b030a6bdf6..5b47d6b65275ba6835043e8a050958ba014d0ed2 100644 (file)
--- a/arch/mips/sgi-ip27/ip27-smp.c
+++ b/arch/mips/sgi-ip27/ip27-smp.c
@@ -76,7 +76,7 @@ static int do_cpumask(cnodeid_t cnode, nasid_t nasid, int highest)
                        /* Only let it join in if it's marked enabled */
                        if ((acpu->cpu_info.flags & KLINFO_ENABLE) &&
                            (tot_cpus_found != NR_CPUS)) {
-                               cpu_set(cpuid, phys_cpu_present_map);
+                               cpu_set(cpuid, cpu_possible_map);
                                alloc_cpupda(cpuid, tot_cpus_found);
                                cpus_found++;
                                tot_cpus_found++;

diff --git a/arch/mips/sibyte/bcm1480/smp.c b/arch/mips/sibyte/bcm1480/smp.c
index bd9eeb43ed0e1bd86a365322374ae9b9cfdfe25c..dddfda8e829461e8297ab44cfad6501e34641ca3 100644 (file)
--- a/arch/mips/sibyte/bcm1480/smp.c
+++ b/arch/mips/sibyte/bcm1480/smp.c
@@ -136,7 +136,7 @@ static void __cpuinit bcm1480_boot_secondary(int cpu, struct task_struct *idle)
 
 /*
  * Use CFE to find out how many CPUs are available, setting up
- * phys_cpu_present_map and the logical/physical mappings.
+ * cpu_possible_map and the logical/physical mappings.
  * XXXKW will the boot CPU ever not be physical 0?
  *
  * Common setup before any secondaries are started
@@ -145,14 +145,14 @@ static void __init bcm1480_smp_setup(void)
 {
        int i, num;
 
-       cpus_clear(phys_cpu_present_map);
-       cpu_set(0, phys_cpu_present_map);
+       cpus_clear(cpu_possible_map);
+       cpu_set(0, cpu_possible_map);
        __cpu_number_map[0] = 0;
        __cpu_logical_map[0] = 0;
 
        for (i = 1, num = 0; i < NR_CPUS; i++) {
                if (cfe_cpu_stop(i) == 0) {
-                       cpu_set(i, phys_cpu_present_map);
+                       cpu_set(i, cpu_possible_map);
                        __cpu_number_map[i] = ++num;
                        __cpu_logical_map[num] = i;
                }

diff --git a/arch/mips/sibyte/sb1250/smp.c b/arch/mips/sibyte/sb1250/smp.c
index 0734b933e969240054bd54e8f05f65608ba20f4c..5950a288a7daab17939664417fadacd68ca28d7b 100644 (file)
--- a/arch/mips/sibyte/sb1250/smp.c
+++ b/arch/mips/sibyte/sb1250/smp.c
@@ -124,7 +124,7 @@ static void __cpuinit sb1250_boot_secondary(int cpu, struct task_struct *idle)
 
 /*
  * Use CFE to find out how many CPUs are available, setting up
- * phys_cpu_present_map and the logical/physical mappings.
+ * cpu_possible_map and the logical/physical mappings.
  * XXXKW will the boot CPU ever not be physical 0?
  *
  * Common setup before any secondaries are started
@@ -133,14 +133,14 @@ static void __init sb1250_smp_setup(void)
 {
        int i, num;
 
-       cpus_clear(phys_cpu_present_map);
-       cpu_set(0, phys_cpu_present_map);
+       cpus_clear(cpu_possible_map);
+       cpu_set(0, cpu_possible_map);
        __cpu_number_map[0] = 0;
        __cpu_logical_map[0] = 0;
 
        for (i = 1, num = 0; i < NR_CPUS; i++) {
                if (cfe_cpu_stop(i) == 0) {
-                       cpu_set(i, phys_cpu_present_map);
+                       cpu_set(i, cpu_possible_map);
                        __cpu_number_map[i] = ++num;
                        __cpu_logical_map[num] = i;
                }

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 644a70b1b04e4fd9ecf16d2e73d6e22ea5227115..aacf11d33723edc80aa3638ba5256e83d0c74bf2 100644 (file)
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -11,6 +11,7 @@ config PARISC
        select HAVE_OPROFILE
        select RTC_CLASS
        select RTC_DRV_PARISC
+       select INIT_ALL_POSSIBLE
        help
          The PA-RISC microprocessor is designed by Hewlett-Packard and used
          in many of their workstations & servers (HP9000 700 and 800 series,

diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index d47f3975c9c6b683d4e0cfaf21dcf9156d68988d..80bc000523face7176458cf26c452f461ecd6413 100644 (file)
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -67,21 +67,6 @@ static volatile int cpu_now_booting __read_mostly = 0;       /* track which CPU is boo
 
 static int parisc_max_cpus __read_mostly = 1;
 
-/* online cpus are ones that we've managed to bring up completely
- * possible cpus are all valid cpu 
- * present cpus are all detected cpu
- *
- * On startup we bring up the "possible" cpus. Since we discover
- * CPUs later, we add them as hotplug, so the possible cpu mask is
- * empty in the beginning.
- */
-
-cpumask_t cpu_online_map   __read_mostly = CPU_MASK_NONE;      /* Bitmap of online CPUs */
-cpumask_t cpu_possible_map __read_mostly = CPU_MASK_ALL;       /* Bitmap of Present CPUs */
-
-EXPORT_SYMBOL(cpu_online_map);
-EXPORT_SYMBOL(cpu_possible_map);
-
 DEFINE_PER_CPU(spinlock_t, ipi_lock) = SPIN_LOCK_UNLOCKED;
 
 enum ipi_message_type {

diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index ff9f7010097d1568943329a15d8c04458beddc4c..d1165566f06487a6860e8d14e3586f7230d6b66d 100644 (file)
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -60,13 +60,9 @@
 int smp_hw_index[NR_CPUS];
 struct thread_info *secondary_ti;
 
-cpumask_t cpu_possible_map = CPU_MASK_NONE;
-cpumask_t cpu_online_map = CPU_MASK_NONE;
 DEFINE_PER_CPU(cpumask_t, cpu_sibling_map) = CPU_MASK_NONE;
 DEFINE_PER_CPU(cpumask_t, cpu_core_map) = CPU_MASK_NONE;
 
-EXPORT_SYMBOL(cpu_online_map);
-EXPORT_SYMBOL(cpu_possible_map);
 EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
 EXPORT_PER_CPU_SYMBOL(cpu_core_map);
 

diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 8116a3328a19dd9b0cc79bbc3cd5b32a10e0234a..b4aa5869c7f9c5b9eef1ce41bd56d0b7eeb4677b 100644 (file)
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -75,6 +75,7 @@ config S390
        select HAVE_KRETPROBES
        select HAVE_KVM if 64BIT
        select HAVE_ARCH_TRACEHOOK
+       select INIT_ALL_POSSIBLE
 
 source "init/Kconfig"
 

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index b5595688a47777d72eb803dd00fd8a15b35dee66..f03914b8ed2f85942416266fa15758a20bb0b5eb 100644 (file)
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -52,12 +52,6 @@
 struct _lowcore *lowcore_ptr[NR_CPUS];
 EXPORT_SYMBOL(lowcore_ptr);
 
-cpumask_t cpu_online_map = CPU_MASK_NONE;
-EXPORT_SYMBOL(cpu_online_map);
-
-cpumask_t cpu_possible_map = CPU_MASK_ALL;
-EXPORT_SYMBOL(cpu_possible_map);
-
 static struct task_struct *current_set[NR_CPUS];
 
 static u8 smp_cpu_type;

diff --git a/arch/sh/kernel/smp.c b/arch/sh/kernel/smp.c
index 3c5ad1660bbcdd6b0366934167b3dc879cdb026d..593937d0c495a1cbda18fae03c25418c6dd60801 100644 (file)
--- a/arch/sh/kernel/smp.c
+++ b/arch/sh/kernel/smp.c
@@ -31,12 +31,6 @@
 int __cpu_number_map[NR_CPUS];         /* Map physical to logical */
 int __cpu_logical_map[NR_CPUS];                /* Map logical to physical */
 
-cpumask_t cpu_possible_map;
-EXPORT_SYMBOL(cpu_possible_map);
-
-cpumask_t cpu_online_map;
-EXPORT_SYMBOL(cpu_online_map);
-
 static inline void __init smp_store_cpu_info(unsigned int cpu)
 {
        struct sh_cpuinfo *c = cpu_data + cpu;

diff --git a/arch/sparc/include/asm/smp_32.h b/arch/sparc/include/asm/smp_32.h
index a8180e546a48f87a6d5b9a7123d9ed91a3b51a56..8408d9d2a662264c0f71184c22fd62f4dc2adb92 100644 (file)
--- a/arch/sparc/include/asm/smp_32.h
+++ b/arch/sparc/include/asm/smp_32.h
@@ -29,8 +29,6 @@
  */
 
 extern unsigned char boot_cpu_id;
-extern cpumask_t phys_cpu_present_map;
-#define cpu_possible_map phys_cpu_present_map
 
 typedef void (*smpfunc_t)(unsigned long, unsigned long, unsigned long,
                       unsigned long, unsigned long);

diff --git a/arch/sparc/kernel/smp.c b/arch/sparc/kernel/smp.c
index e396c1f17a922deaef7b03a0751d06f1345770fd..1e5ac4e282e1285030aaa43380b91c01b7bcff48 100644 (file)
--- a/arch/sparc/kernel/smp.c
+++ b/arch/sparc/kernel/smp.c
@@ -39,8 +39,6 @@ volatile unsigned long cpu_callin_map[NR_CPUS] __cpuinitdata = {0,};
 unsigned char boot_cpu_id = 0;
 unsigned char boot_cpu_id4 = 0; /* boot_cpu_id << 2 */
 
-cpumask_t cpu_online_map = CPU_MASK_NONE;
-cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
 cpumask_t smp_commenced_mask = CPU_MASK_NONE;
 
 /* The only guaranteed locking primitive available on all Sparc
@@ -334,7 +332,7 @@ void __init smp_setup_cpu_possible_map(void)
        instance = 0;
        while (!cpu_find_by_instance(instance, NULL, &mid)) {
                if (mid < NR_CPUS) {
-                       cpu_set(mid, phys_cpu_present_map);
+                       cpu_set(mid, cpu_possible_map);
                        cpu_set(mid, cpu_present_map);
                }
                instance++;
@@ -354,7 +352,7 @@ void __init smp_prepare_boot_cpu(void)
 
        current_thread_info()->cpu = cpuid;
        cpu_set(cpuid, cpu_online_map);
-       cpu_set(cpuid, phys_cpu_present_map);
+       cpu_set(cpuid, cpu_possible_map);
 }
 
 int __cpuinit __cpu_up(unsigned int cpu)

diff --git a/arch/sparc/kernel/sparc_ksyms.c b/arch/sparc/kernel/sparc_ksyms.c
index b0dfff84865365a595e39283e480b1ccbd9eb850..32d11a5fe3a86f9e5f60acfefff09a2dd0d98c41 100644 (file)
--- a/arch/sparc/kernel/sparc_ksyms.c
+++ b/arch/sparc/kernel/sparc_ksyms.c
@@ -113,10 +113,6 @@ EXPORT_PER_CPU_SYMBOL(__cpu_data);
 #ifdef CONFIG_SMP
 /* IRQ implementation. */
 EXPORT_SYMBOL(synchronize_irq);
-
-/* CPU online map and active count. */
-EXPORT_SYMBOL(cpu_online_map);
-EXPORT_SYMBOL(phys_cpu_present_map);
 #endif
 
 EXPORT_SYMBOL(__udelay);

diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index f500b0618bb0d3b4badcdee2c5c8cb20225c97e9..a97b8822c22ca029acc8ea1fe0fc6cc90c88efd0 100644 (file)
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -49,14 +49,10 @@
 
 int sparc64_multi_core __read_mostly;
 
-cpumask_t cpu_possible_map __read_mostly = CPU_MASK_NONE;
-cpumask_t cpu_online_map __read_mostly = CPU_MASK_NONE;
 DEFINE_PER_CPU(cpumask_t, cpu_sibling_map) = CPU_MASK_NONE;
 cpumask_t cpu_core_map[NR_CPUS] __read_mostly =
        { [0 ... NR_CPUS-1] = CPU_MASK_NONE };
 
-EXPORT_SYMBOL(cpu_possible_map);
-EXPORT_SYMBOL(cpu_online_map);
 EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
 EXPORT_SYMBOL(cpu_core_map);
 

diff --git a/arch/um/kernel/smp.c b/arch/um/kernel/smp.c
index 045772142844690f2471d9330b836da594c945f8..98351c78bc814de7062dc5e9c213810ee4811de5 100644 (file)
--- a/arch/um/kernel/smp.c
+++ b/arch/um/kernel/smp.c
@@ -25,13 +25,6 @@ DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 #include "irq_user.h"
 #include "os.h"
 
-/* CPU online map, set by smp_boot_cpus */
-cpumask_t cpu_online_map = CPU_MASK_NONE;
-cpumask_t cpu_possible_map = CPU_MASK_NONE;
-
-EXPORT_SYMBOL(cpu_online_map);
-EXPORT_SYMBOL(cpu_possible_map);
-
 /* Per CPU bogomips and other parameters
  * The only piece used here is the ipi pipe, which is set before SMP is
  * started and never changed.

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 7b1093397319766b2e4848a5a883b0dc35f49804..468c2f9d47aec1c76fcc8dd585b1ccfc95f3e335 100644 (file)
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -101,14 +101,8 @@ EXPORT_SYMBOL(smp_num_siblings);
 /* Last level cache ID of each logical CPU */
 DEFINE_PER_CPU(u16, cpu_llc_id) = BAD_APICID;
 
-/* bitmap of online cpus */
-cpumask_t cpu_online_map __read_mostly;
-EXPORT_SYMBOL(cpu_online_map);
-
 cpumask_t cpu_callin_map;
 cpumask_t cpu_callout_map;
-cpumask_t cpu_possible_map;
-EXPORT_SYMBOL(cpu_possible_map);
 
 /* representing HT siblings of each logical CPU */
 DEFINE_PER_CPU(cpumask_t, cpu_sibling_map);

diff --git a/arch/x86/mach-voyager/voyager_smp.c b/arch/x86/mach-voyager/voyager_smp.c
index 52145007bd7efb8e99a9516ddeb09af6ea1e445b..9c990185e9f2676500115db4d452c57b1d5b625d 100644 (file)
--- a/arch/x86/mach-voyager/voyager_smp.c
+++ b/arch/x86/mach-voyager/voyager_smp.c
@@ -63,11 +63,6 @@ static int voyager_extended_cpus = 1;
 /* Used for the invalidate map that's also checked in the spinlock */
 static volatile unsigned long smp_invalidate_needed;
 
-/* Bitmask of currently online CPUs - used by setup.c for
-   /proc/cpuinfo, visible externally but still physical */
-cpumask_t cpu_online_map = CPU_MASK_NONE;
-EXPORT_SYMBOL(cpu_online_map);
-
 /* Bitmask of CPUs present in the system - exported by i386_syms.c, used
  * by scheduler but indexed physically */
 cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
@@ -218,8 +213,6 @@ static cpumask_t smp_commenced_mask = CPU_MASK_NONE;
 /* This is for the new dynamic CPU boot code */
 cpumask_t cpu_callin_map = CPU_MASK_NONE;
 cpumask_t cpu_callout_map = CPU_MASK_NONE;
-cpumask_t cpu_possible_map = CPU_MASK_NONE;
-EXPORT_SYMBOL(cpu_possible_map);
 
 /* The per processor IRQ masks (these are usually kept in sync) */
 static __u16 vic_irq_mask[NR_CPUS] __cacheline_aligned;

diff --git a/include/asm-m32r/smp.h b/include/asm-m32r/smp.h
index c5dd66916692ad1723fa29bd34089165afef582c..b96a6d2ffbc3f16161cb7fbc8e85de866dfeaaf3 100644 (file)
--- a/include/asm-m32r/smp.h
+++ b/include/asm-m32r/smp.h
@@ -63,8 +63,6 @@ extern volatile int cpu_2_physid[NR_CPUS];
 #define raw_smp_processor_id() (current_thread_info()->cpu)
 
 extern cpumask_t cpu_callout_map;
-extern cpumask_t cpu_possible_map;
-extern cpumask_t cpu_present_map;
 
 static __inline__ int hard_smp_processor_id(void)
 {

diff --git a/init/Kconfig b/init/Kconfig
index f763762d544a135a0a06f67f36701b9f0d331140..7656623f50069e915c58fa773ec1a8e210050638 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -916,6 +916,15 @@ config KMOD
 
 endif # MODULES
 
+config INIT_ALL_POSSIBLE
+       bool
+       help
+         Back when each arch used to define their own cpu_online_map and
+         cpu_possible_map, some of them chose to initialize cpu_possible_map
+         with all 1s, and others with all 0s.  When they were centralised,
+         it was better to provide this option than to break all the archs
+         and have several arch maintainers persuing me down dark alleys.
+
 config STOP_MACHINE
        bool
        default y

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 8ea32e8d68b05c95b211830deee92d9a7929637b..bae131a1211b55a9051bfe581dd74df8e72dc248 100644 (file)
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -24,19 +24,20 @@
 cpumask_t cpu_present_map __read_mostly;
 EXPORT_SYMBOL(cpu_present_map);
 
-#ifndef CONFIG_SMP
-
 /*
  * Represents all cpu's that are currently online.
  */
-cpumask_t cpu_online_map __read_mostly = CPU_MASK_ALL;
+cpumask_t cpu_online_map __read_mostly;
 EXPORT_SYMBOL(cpu_online_map);
 
+#ifdef CONFIG_INIT_ALL_POSSIBLE
 cpumask_t cpu_possible_map __read_mostly = CPU_MASK_ALL;
+#else
+cpumask_t cpu_possible_map __read_mostly;
+#endif
 EXPORT_SYMBOL(cpu_possible_map);
 
-#else /* CONFIG_SMP */
-
+#ifdef CONFIG_SMP
 /* Serializes the updates to cpu_online_map, cpu_present_map */
 static DEFINE_MUTEX(cpu_add_remove_lock);