[S390] Fix FCP dump feature detection.

FCP dump feature detection works only if the sclp command in head.S
was succesful. Since the sclp command is skipped if diag260 works,
we don't have any dump feature detection anymore.
Bug was introduced with d57de5a36791cb1b7285649c62f183b0d3505f7d.

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

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index 6ba3f4512dd1..e940e802cb40 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -81,7 +81,6 @@ startup_continue:
         aghi    %r1,1                   # size is one more than end
         larl    %r2,memory_chunk
         stg     %r1,8(%r2)              # store size of chunk
-        j       .Ldonemem
 
 .Lslowmemdetect:
         l       %r2,.Lrcp-.LPG1(%r13)   # Read SCP forced command word
@@ -156,6 +155,11 @@ startup_continue:
 #
 # find memory chunks.
 #
+        larl    %r9,memory_chunk        # skip tprot loop if diag260
+        lg      %r9,8(%r9)              # memory detection was successful
+        ltgr    %r9,%r9
+        jne     .Ldonemem
+
         lgr     %r9,%r3                 # end of mem
         larl    %r1,.Lchkmem            # set program check address
         stg     %r1,__LC_PGM_NEW_PSW+8