AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

[S390] cpuinfo: use get_online_cpus() instead of preempt_disable()

Browse Source 
Use get_online_cpus() instead of preempt_disable() to make sure cpus
don't go offline while accessing their per cpu data.
The preempt_disable() stuff is old code which was used before
get_online_cpus() was available.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2011-01-05 12:48:17 +01:00 committed by Martin Schwidefsky
parent 974de4d7e7
commit 19726cec63
1 changed files with 3 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/s390/kernel/processor.c
View File

@ -13,7 +13,7 @@
#include <linux/smp.h>
#include <linux/seq_file.h>
#include <linux/delay.h>
#include <linux/cpu.h>
#include <asm/elf.h>
#include <asm/lowcore.h>
#include <asm/param.h>
@ -47,7 +47,6 @@ static int show_cpuinfo(struct seq_file *m, void *v)
int i;
s390_adjust_jiffies();
preempt_disable();
if (!n) {
seq_printf(m, "vendor_id : IBM/S390\n"
"# processors : %i\n"
@ -60,7 +59,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
seq_printf(m, "%s ", hwcap_str[i]);
seq_puts(m, "\n");
}
get_online_cpus();
if (cpu_online(n)) {
struct cpuid *id = &per_cpu(cpu_id, n);
seq_printf(m, "processor %li: "
@ -69,7 +68,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
"machine = %04X\n",
n, id->version, id->ident, id->machine);
}
preempt_enable();
put_online_cpus();
return 0;
}