[S390] memory detection misses 128k.

Fix a memory leak problem in the memory detection routines.  A memory leak
of 128k occurs when we have a contiguous memory with mixed access-mode
(read or write) ranges.

Signed-off-by: Hongjie Yang <hongjie@us.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index c526279e1123..6ba3f4512dd1 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -172,12 +172,15 @@ startup_continue:
         srl     %r7,28
         clr     %r6,%r7                 # compare cc with last access code
         je      .Lsame
-        j       .Lchkmem
+        lghi    %r8,0                   # no program checks
+        j       .Lsavchk
 .Lsame:
         algr    %r5,%r1                 # add 128KB to end of chunk
                                         # no need to check here,
         brc     12,.Lloop               # this is the same chunk
 .Lchkmem:                               # > 16EB or tprot got a program check
+        lghi    %r8,1                   # set program check flag
+.Lsavchk:
         clgr    %r4,%r5                 # chunk size > 0?
         je      .Lchkloop
         stg     %r4,0(%r3)              # store start address of chunk
@@ -204,8 +207,15 @@ startup_continue:
         chi     %r10, 0                 # do we have chunks left?
         je      .Ldonemem
 .Lhsaskip:
+        chi     %r8,1                   # program check ?
+        je      .Lpgmchk
+        lgr     %r4,%r5                 # potential new chunk
+        algr    %r5,%r1                 # add 128KB to end of chunk
+        j       .Llpcnt
+.Lpgmchk:
         algr    %r5,%r1                 # add 128KB to end of chunk
         lgr     %r4,%r5                 # potential new chunk
+.Llpcnt:
         clgr    %r5,%r9                 # should we go on?
         jl      .Lloop
 .Ldonemem: