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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2015-03-30 12:51:42 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2015-04-13 10:46:20 +0200 |
| commit | a1307bba1adcc9b338511180fa94a54b4c3f534b (patch) | |
| tree | 0981b3630258d145af09a296d1b619a2b39a13f2 /arch/s390 | |
| parent | d74419495633493c9cd3f2bbeb7f3529d0edded6 (diff) | |
| download | linux-a1307bba1adcc9b338511180fa94a54b4c3f534b.tar.bz2 | |
s390/smp: wait until secondaries are active & online
This is the s390 version of 875ebe940d77 ("powerpc/smp: Wait until secondaries
are active & online").
The race described in length within the commit message is also possible on s390
and every other architecture. So fix this race on s390 as well.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/kernel/smp.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index d140160c9aec..efd2c1968000 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -818,7 +818,8 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle) pcpu_prepare_secondary(pcpu, cpu); pcpu_attach_task(pcpu, tidle); pcpu_start_fn(pcpu, smp_start_secondary, NULL); - while (!cpu_online(cpu)) + /* Wait until cpu puts itself in the online & active maps */ + while (!cpu_online(cpu) || !cpu_active(cpu)) cpu_relax(); return 0; } |