Messages in this thread Patch in this message | | | From | gregkh@linuxfou ... | Subject | [PATCH 5.4 083/168] s390/smp: __smp_rescan_cpus() - move cpumask away from stack | Date | Mon, 15 Mar 2021 14:55:15 +0100 |
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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(-)
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 659d99af9156..8c51462f13fd 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -765,7 +765,7 @@ 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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