forked from luck/tmp_suning_uos_patched
[PATCH] i386 boottime for_each_cpu broken
for_each_cpu walks through all processors in cpu_possible_map, which is defined as cpu_callout_map on i386 and isn't initialised until all processors have been booted. This breaks things which do for_each_cpu iterations early during boot. So, define cpu_possible_map as a bitmap with NR_CPUS bits populated. This was triggered by a patch i'm working on which does alloc_percpu before bringing up secondary processors. From: Alexander Nyberg <alexn@telia.com> i386-boottime-for_each_cpu-broken.patch i386-boottime-for_each_cpu-broken-fix.patch The SMP version of __alloc_percpu checks the cpu_possible_map before allocating memory for a certain cpu. With the above patches the BSP cpuid is never set in cpu_possible_map which breaks CONFIG_SMP on uniprocessor machines (as soon as someone tries to dereference something allocated via __alloc_percpu, which in fact is never allocated since the cpu is not set in cpu_possible_map). Signed-off-by: Zwane Mwaikambo <zwane@arm.linux.org.uk> Signed-off-by: Alexander Nyberg <alexn@telia.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
parent
d7271b14b2
commit
4ad8d38342
|
@ -122,7 +122,7 @@ static int MP_valid_apicid(int apicid, int version)
|
|||
|
||||
static void __init MP_processor_info (struct mpc_config_processor *m)
|
||||
{
|
||||
int ver, apicid;
|
||||
int ver, apicid, cpu, found_bsp = 0;
|
||||
physid_mask_t tmp;
|
||||
|
||||
if (!(m->mpc_cpuflag & CPU_ENABLED))
|
||||
|
@ -181,6 +181,7 @@ static void __init MP_processor_info (struct mpc_config_processor *m)
|
|||
if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
|
||||
Dprintk(" Bootup CPU\n");
|
||||
boot_cpu_physical_apicid = m->mpc_apicid;
|
||||
found_bsp = 1;
|
||||
}
|
||||
|
||||
if (num_processors >= NR_CPUS) {
|
||||
|
@ -204,6 +205,11 @@ static void __init MP_processor_info (struct mpc_config_processor *m)
|
|||
return;
|
||||
}
|
||||
|
||||
if (found_bsp)
|
||||
cpu = 0;
|
||||
else
|
||||
cpu = num_processors - 1;
|
||||
cpu_set(cpu, cpu_possible_map);
|
||||
tmp = apicid_to_cpu_present(apicid);
|
||||
physids_or(phys_cpu_present_map, phys_cpu_present_map, tmp);
|
||||
|
||||
|
|
|
@ -88,6 +88,8 @@ EXPORT_SYMBOL(cpu_online_map);
|
|||
cpumask_t cpu_callin_map;
|
||||
cpumask_t cpu_callout_map;
|
||||
EXPORT_SYMBOL(cpu_callout_map);
|
||||
cpumask_t cpu_possible_map;
|
||||
EXPORT_SYMBOL(cpu_possible_map);
|
||||
static cpumask_t smp_commenced_mask;
|
||||
|
||||
/* TSC's upper 32 bits can't be written in eariler CPU (before prescott), there
|
||||
|
@ -1265,6 +1267,7 @@ void __devinit smp_prepare_boot_cpu(void)
|
|||
cpu_set(smp_processor_id(), cpu_online_map);
|
||||
cpu_set(smp_processor_id(), cpu_callout_map);
|
||||
cpu_set(smp_processor_id(), cpu_present_map);
|
||||
cpu_set(smp_processor_id(), cpu_possible_map);
|
||||
per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE;
|
||||
}
|
||||
|
||||
|
|
|
@ -242,6 +242,8 @@ static cpumask_t smp_commenced_mask = CPU_MASK_NONE;
|
|||
cpumask_t cpu_callin_map = CPU_MASK_NONE;
|
||||
cpumask_t cpu_callout_map = CPU_MASK_NONE;
|
||||
EXPORT_SYMBOL(cpu_callout_map);
|
||||
cpumask_t cpu_possible_map = CPU_MASK_ALL;
|
||||
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;
|
||||
|
@ -1910,6 +1912,7 @@ void __devinit smp_prepare_boot_cpu(void)
|
|||
{
|
||||
cpu_set(smp_processor_id(), cpu_online_map);
|
||||
cpu_set(smp_processor_id(), cpu_callout_map);
|
||||
cpu_set(smp_processor_id(), cpu_possible_map);
|
||||
}
|
||||
|
||||
int __devinit
|
||||
|
|
|
@ -59,7 +59,7 @@ extern void cpu_uninit(void);
|
|||
|
||||
extern cpumask_t cpu_callout_map;
|
||||
extern cpumask_t cpu_callin_map;
|
||||
#define cpu_possible_map cpu_callout_map
|
||||
extern cpumask_t cpu_possible_map;
|
||||
|
||||
/* We don't mark CPUs online until __cpu_up(), so we need another measure */
|
||||
static inline int num_booting_cpus(void)
|
||||
|
|
Loading…
Reference in New Issue
Block a user