[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/head31.S b/arch/s390/kernel/head31.S
index 4388b3309e0c..eca507050e47 100644
--- a/arch/s390/kernel/head31.S
+++ b/arch/s390/kernel/head31.S
@@ -164,11 +164,14 @@ startup_continue:
         srl     %r7,28
         clr     %r6,%r7                 # compare cc with last access code
         be      .Lsame-.LPG1(%r13)
-        b       .Lchkmem-.LPG1(%r13)
+        lhi     %r8,0                   # no program checks
+        b       .Lsavchk-.LPG1(%r13)
 .Lsame:
         ar      %r5,%r1                 # add 128KB to end of chunk
         bno     .Lloop-.LPG1(%r13)      # r1 < 0x80000000 -> loop
 .Lchkmem:                               # > 2GB or tprot got a program check
+        lhi     %r8,1                   # set program check flag
+.Lsavchk:
         clr     %r4,%r5                 # chunk size > 0?
         be      .Lchkloop-.LPG1(%r13)
         st      %r4,0(%r3)              # store start address of chunk
@@ -190,8 +193,15 @@ startup_continue:
         je      .Ldonemem               # if not, leave
         chi     %r10,0                  # do we have chunks left?
         je      .Ldonemem
+        chi     %r8,1                   # program check ?
+        je      .Lpgmchk
+        lr      %r4,%r5                 # potential new chunk
+        alr     %r5,%r1                 # add 128KB to end of chunk
+        j       .Llpcnt
+.Lpgmchk:
         alr     %r5,%r1                 # add 128KB to end of chunk
         lr      %r4,%r5                 # potential new chunk
+.Llpcnt:
         clr     %r5,%r9                 # should we go on?
         jl      .Lloop
 .Ldonemem: