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    Subject[PATCH AUTOSEL 4.19 18/21] s390/smp: __smp_rescan_cpus() - move cpumask away from stack
    Date
    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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