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[5.10,160/290] s390/smp: __smp_rescan_cpus() - move cpumask away from stack

Message ID 20210315135547.312229029@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

Greg KH March 15, 2021, 1:54 p.m. UTC 
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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(-)
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Patch

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 3a0d545f0ce8..791bc373418b 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -775,7 +775,7 @@  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;