From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
[S390] memory detection: fix off by one bug.
diag 260 returns the address of the last addressable byte and not the
size of memory. Since we want the size we have to add 1 to the return
value.
Disable diag 260 for non z/Arch mode since it doesn't work there
anyway.
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
---
arch/s390/kernel/early.c | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)
diff -urpN linux-2.6/arch/s390/kernel/early.c linux-2.6-patched/arch/s390/kernel/early.c
--- linux-2.6/arch/s390/kernel/early.c 2007-03-12 13:52:25.000000000 +0100
+++ linux-2.6-patched/arch/s390/kernel/early.c 2007-03-12 13:52:58.000000000 +0100
@@ -141,9 +141,9 @@ static noinline __init void detect_machi
machine_flags |= 4;
}
+#ifdef CONFIG_64BIT
static noinline __init int memory_fast_detect(void)
{
-
unsigned long val0 = 0;
unsigned long val1 = 0xc;
int ret = -ENOSYS;
@@ -161,9 +161,15 @@ static noinline __init int memory_fast_d
if (ret || val0 != val1)
return -ENOSYS;
- memory_chunk[0].size = val0;
+ memory_chunk[0].size = val0 + 1;
return 0;
}
+#else
+static inline int memory_fast_detect(void)
+{
+ return -ENOSYS;
+}
+#endif
#define ADDR2G (1UL << 31)
-
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