[PATCH AUTOSEL 4.14 12/13] s390/smp: __smp_rescan_cpus() - move cpumask away from stack
From: Sasha Levin <sashal@kernel.org>
Date: 2021-03-02 17:02:23
Also in:
lkml, stable
Subsystem:
s390 architecture, the rest · Maintainers:
Heiko Carstens, Vasily Gorbik, Alexander Gordeev, Linus Torvalds
From: Heiko Carstens <hca@linux.ibm.com> [ Upstream commit 62c8dca9e194326802b43c60763f856d782b225c ] Avoid a potentially large stack frame and overflow by making "cpumask_t avail" a static variable. There is no concurrent access due to the existing locking. Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- arch/s390/kernel/smp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 40946c8587a5..d43b48d8f67d 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c@@ -761,7 +761,7 @@ static int smp_add_core(struct sclp_core_entry *core, cpumask_t *avail, static int __smp_rescan_cpus(struct sclp_core_info *info, bool early) { struct sclp_core_entry *core; - cpumask_t avail; + static cpumask_t avail; bool configured; u16 core_id; int nr, i;
--
2.30.1