[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>

diff --git a/arch/s390/kernel/head31.S b/arch/s390/kernel/head31.S
index 4388b33..eca5070 100644 (file)
--- 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:

diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index c526279..6ba3f45 100644 (file)
--- 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: