s390/smp: use physical address for SIGP_SET_PREFIX command

Signal processor SIGP_SET_PREFIX command expects physical
address of the lowcore to be installed, but instead the
virtual address is provided.

Note: this does not fix a bug currently, since virtual and
physical addresses are identical.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 51529c33c7bf2f01d7800af4cf817f7fbc063f6a..30c91d56593374fcb8b43a1be5a5fe6eefa00a3c 100644 (file)
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -213,7 +213,7 @@ static int pcpu_alloc_lowcore(struct pcpu *pcpu, int cpu)
        if (nmi_alloc_mcesa(&lc->mcesad))
                goto out;
        lowcore_ptr[cpu] = lc;
-       pcpu_sigp_retry(pcpu, SIGP_SET_PREFIX, (u32)(unsigned long) lc);
+       pcpu_sigp_retry(pcpu, SIGP_SET_PREFIX, __pa(lc));
        return 0;
 
 out: