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x86: show cpuinfo only for online CPUs

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Fix regressions introduced with 92cb7612ae.

It can happen that cpuinfo is displayed for CPUs that are not online or
even worse for CPUs not present at all. As an example, following was
shown for a "second" CPU of a single core K8 variant:

    processor       : 0
    vendor_id       : unknown
    cpu family      : 0
    model           : 0
    model name      : unknown
    stepping        : 0
    cache size      : 0 KB
    fpu             : yes
    fpu_exception   : yes
    cpuid level     : 0
    wp              : yes
    flags           :
    bogomips        : 0.00
    clflush size    : 0
    cache_alignment : 0
    address sizes   : 0 bits physical, 0 bits virtual
    power management:

Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Andreas Herrmann 2007-11-01 19:32:17 +01:00 committed by Thomas Gleixner
parent 903675569e
commit c0c52d28e0
2 changed files with 6 additions and 10 deletions
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8
arch/x86/kernel/cpu/proc.c
View File

@ -89,8 +89,6 @@ static int show_cpuinfo(struct seq_file *m, void *v)
int fpu_exception;
#ifdef CONFIG_SMP
if (!cpu_online(n))
return 0;
n = c->cpu_index;
#endif
seq_printf(m, "processor\t: %d\n"
@ -177,14 +175,14 @@ static int show_cpuinfo(struct seq_file *m, void *v)
static void *c_start(struct seq_file *m, loff_t *pos)
{
if (*pos == 0) /* just in case, cpu 0 is not the first */
*pos = first_cpu(cpu_possible_map);
if ((*pos) < NR_CPUS && cpu_possible(*pos))
*pos = first_cpu(cpu_online_map);
if ((*pos) < NR_CPUS && cpu_online(*pos))
return &cpu_data(*pos);
return NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
*pos = next_cpu(*pos, cpu_possible_map);
*pos = next_cpu(*pos, cpu_online_map);
return c_start(m, pos);
}
static void c_stop(struct seq_file *m, void *v)

8
arch/x86/kernel/setup_64.c
View File

@ -1078,8 +1078,6 @@ static int show_cpuinfo(struct seq_file *m, void *v)
#ifdef CONFIG_SMP
if (!cpu_online(c->cpu_index))
return 0;
cpu = c->cpu_index;
#endif
@ -1171,15 +1169,15 @@ static int show_cpuinfo(struct seq_file *m, void *v)
static void *c_start(struct seq_file *m, loff_t *pos)
{
if (*pos == 0) /* just in case, cpu 0 is not the first */
*pos = first_cpu(cpu_possible_map);
if ((*pos) < NR_CPUS && cpu_possible(*pos))
*pos = first_cpu(cpu_online_map);
if ((*pos) < NR_CPUS && cpu_online(*pos))
return &cpu_data(*pos);
return NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
*pos = next_cpu(*pos, cpu_possible_map);
*pos = next_cpu(*pos, cpu_online_map);
return c_start(m, pos);
}