* [PATCH AUTOSEL 4.19 18/21] s390/smp: __smp_rescan_cpus() - move cpumask away from stack
[not found] <20210302115835.63269-1-sashal@kernel.org>
@ 2021-03-02 11:58 ` Sasha Levin
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From: Sasha Levin @ 2021-03-02 11:58 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Heiko Carstens, Vasily Gorbik, Sasha Levin, linux-s390
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 c47bd581a08a..bce678c7179c 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -751,7 +751,7 @@ 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
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