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Fix weird uses of num_online_cpus().

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This may be OK in archs with contiguous CPU numbers and without
hotplug CPUs, but it sets a terrible example.

And open-coding it like drivers/scsi/hpsa.c is just weird.

BTRFS has a weird comparison with num_online_cpus() too, but since
BTRFS just screwed up my test machines' root partition, I'm not
touching it :)

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Reported-by: Oleg Drokin <green@linuxhacker.ru>
This commit is contained in:
Rusty Russell 2015-03-05 10:49:19 +10:30
parent 2f0f267ea0
commit c8ed00107b
5 changed files with 8 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/m32r/kernel/smpboot.c
View File

@ -376,7 +376,7 @@ void __init smp_cpus_done(unsigned int max_cpus)
if (!cpumask_equal(&cpu_callin_map, cpu_online_mask))
BUG();
for (cpu_id = 0 ; cpu_id < num_online_cpus() ; cpu_id++)
for_each_online_cpu(cpu_id)
show_cpu_info(cpu_id);
/*

2
arch/sh/include/asm/mmu_context.h
View File

@ -99,7 +99,7 @@ static inline int init_new_context(struct task_struct *tsk,
{
int i;
for (i = 0; i < num_online_cpus(); i++)
for_each_online_cpu(i)
cpu_context(i, mm) = NO_CONTEXT;
return 0;

6
arch/sh/kernel/smp.c
View File

@ -363,7 +363,7 @@ void flush_tlb_mm(struct mm_struct *mm)
smp_call_function(flush_tlb_mm_ipi, (void *)mm, 1);
} else {
int i;
for (i = 0; i < num_online_cpus(); i++)
for_each_online_cpu(i)
if (smp_processor_id() != i)
cpu_context(i, mm) = 0;
}
@ -400,7 +400,7 @@ void flush_tlb_range(struct vm_area_struct *vma,
smp_call_function(flush_tlb_range_ipi, (void *)&fd, 1);
} else {
int i;
for (i = 0; i < num_online_cpus(); i++)
for_each_online_cpu(i)
if (smp_processor_id() != i)
cpu_context(i, mm) = 0;
}
@ -443,7 +443,7 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
smp_call_function(flush_tlb_page_ipi, (void *)&fd, 1);
} else {
int i;
for (i = 0; i < num_online_cpus(); i++)
for_each_online_cpu(i)
if (smp_processor_id() != i)
cpu_context(i, vma->vm_mm) = 0;
}

2
arch/um/kernel/smp.c
View File

@ -45,7 +45,7 @@ void smp_send_stop(void)
int i;
printk(KERN_INFO "Stopping all CPUs...");
for (i = 0; i < num_online_cpus(); i++) {
for_each_online_cpu(i) {
if (i == current_thread->cpu)
continue;
os_write_file(cpu_data[i].ipi_pipe[1], "S", 1);

6
drivers/scsi/hpsa.c
View File

@ -6632,14 +6632,12 @@ static void fail_all_outstanding_cmds(struct ctlr_info *h)
static void set_lockup_detected_for_all_cpus(struct ctlr_info *h, u32 value)
{
int i, cpu;
int cpu;
cpu = cpumask_first(cpu_online_mask);
for (i = 0; i < num_online_cpus(); i++) {
for_each_online_cpu(cpu) {
u32 *lockup_detected;
lockup_detected = per_cpu_ptr(h->lockup_detected, cpu);
*lockup_detected = value;
cpu = cpumask_next(cpu, cpu_online_mask);
}
wmb(); /* be sure the per-cpu variables are out to memory */
}