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authorHeiko Carstens <heiko.carstens@de.ibm.com>2008-08-01 16:39:18 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-08-01 16:39:34 +0200
commitd918fe2bd72830dfbe8ca2bb30d49930d1356e6d (patch)
tree9f5a0623c50a1505be87be15a42bb22a477d6fd7
parent3b8e3004aea95c687e8991583e7b150ec1416ff3 (diff)
[S390] Remove diag 0x260 call from memory detection.
The result of the diag 0x260 call is not always what one would expect. So just remove it. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--arch/s390/kernel/mem_detect.c23
1 files changed, 0 insertions, 23 deletions
diff --git a/arch/s390/kernel/mem_detect.c b/arch/s390/kernel/mem_detect.c
index 18ed7abe16c5..9872999c66d1 100644
--- a/arch/s390/kernel/mem_detect.c
+++ b/arch/s390/kernel/mem_detect.c
@@ -9,27 +9,6 @@
#include <asm/sclp.h>
#include <asm/setup.h>
-static int memory_fast_detect(struct mem_chunk *chunk)
-{
- unsigned long val0 = 0;
- unsigned long val1 = 0xc;
- int rc = -EOPNOTSUPP;
-
- if (ipl_flags & IPL_NSS_VALID)
- return -EOPNOTSUPP;
- asm volatile(
- " diag %1,%2,0x260\n"
- "0: lhi %0,0\n"
- "1:\n"
- EX_TABLE(0b,1b)
- : "+d" (rc), "+d" (val0), "+d" (val1) : : "cc");
-
- if (rc || val0 != val1)
- return -EOPNOTSUPP;
- chunk->size = val0 + 1;
- return 0;
-}
-
static inline int tprot(unsigned long addr)
{
int rc = -EFAULT;
@@ -84,8 +63,6 @@ void detect_memory_layout(struct mem_chunk chunk[])
unsigned long flags, cr0;
memset(chunk, 0, MEMORY_CHUNKS * sizeof(struct mem_chunk));
- if (memory_fast_detect(&chunk[0]) == 0)
- return;
/* Disable IRQs, DAT and low address protection so tprot does the
* right thing and we don't get scheduled away with low address
* protection disabled.

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