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authorHeiko Carstens <heiko.carstens@de.ibm.com>2006-12-04 15:40:56 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2006-12-04 15:40:56 +0100
commit8b62bc9642300471737bc3b77b2a4a2ead46dedb (patch)
tree0e510eac55df04ad244b74149c1fd7b8cc75e5e4 /include/asm-s390
parentce26a8532fd062ccd3f3c589a4be269a2dc20f00 (diff)
[S390] Memory detection fixes.
VMALLOC_END on 31bit should be 0x8000000UL instead of 0x7fffffffL. The page mask which is used to make sure memory_end is on 4MB/2MB boundary is wrong and not needed. Therefore remove it. Make sure a vmalloc area does also exist and work on (future) machines with 4TB and more memory. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'include/asm-s390')
-rw-r--r--include/asm-s390/pgtable.h15
1 files changed, 12 insertions, 3 deletions
diff --git a/include/asm-s390/pgtable.h b/include/asm-s390/pgtable.h
index 36bb6dacf00..2d968a69ed1 100644
--- a/include/asm-s390/pgtable.h
+++ b/include/asm-s390/pgtable.h
@@ -110,13 +110,22 @@ extern char empty_zero_page[PAGE_SIZE];
#define VMALLOC_OFFSET (8*1024*1024)
#define VMALLOC_START (((unsigned long) high_memory + VMALLOC_OFFSET) \
& ~(VMALLOC_OFFSET-1))
+
+/*
+ * We need some free virtual space to be able to do vmalloc.
+ * VMALLOC_MIN_SIZE defines the minimum size of the vmalloc
+ * area. On a machine with 2GB memory we make sure that we
+ * have at least 128MB free space for vmalloc. On a machine
+ * with 4TB we make sure we have at least 1GB.
+ */
#ifndef __s390x__
-# define VMALLOC_END (0x7fffffffL)
+#define VMALLOC_MIN_SIZE 0x8000000UL
+#define VMALLOC_END 0x80000000UL
#else /* __s390x__ */
-# define VMALLOC_END (0x40000000000L)
+#define VMALLOC_MIN_SIZE 0x40000000UL
+#define VMALLOC_END 0x40000000000UL
#endif /* __s390x__ */
-
/*
* A 31 bit pagetable entry of S390 has following format:
* | PFRA | | OS |