[S390] Limit cpu detection to 256 physical cpus.

Saves us more than 65k pointless IPIs.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 3 insertions, 5 deletions

diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index bdcb3f05bcd1..6a250808092b 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -62,9 +62,9 @@ startup_continue:
         clr     %r11,%r12
         je      5f                      # no more space in prefix array
 4:
-        ahi     %r8,1                           # next cpu (r8 += 1)
-        cl      %r8,.Llast_cpu-.LPG1(%r13)      # is last possible cpu ?
-        jl      1b                              # jump if not last cpu
+        ahi     %r8,1                   # next cpu (r8 += 1)
+        chi     %r8,MAX_CPU_ADDRESS     # is last possible cpu ?
+        jle     1b                      # jump if not last cpu
 5:
         lhi     %r1,2                   # mode 2 = esame (dump)
         j       6f
@@ -130,8 +130,6 @@ startup_continue:
 #ifdef CONFIG_ZFCPDUMP
 .Lcurrent_cpu:
         .long 0x0
-.Llast_cpu:
-        .long 0x0000ffff
 .Lpref_arr_ptr:
         .long zfcpdump_prefix_array
 #endif /* CONFIG_ZFCPDUMP */