This is a note to let you know that I've just added the patch titled
s390/smp: __smp_rescan_cpus() - move cpumask away from stack
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
s390-smp-__smp_rescan_cpus-move-cpumask-away-from-st.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b507bec8dea6ec3af2427cb1eac1964bb78a209a
Author: Heiko Carstens <hca@xxxxxxxxxxxxx>
Date: Wed Feb 17 07:13:02 2021 +0100
s390/smp: __smp_rescan_cpus() - move cpumask away from stack
[ 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@xxxxxxxxxxxxx>
Signed-off-by: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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;
