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authorHeiko Carstens <heiko.carstens@de.ibm.com>2009-06-12 10:26:33 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-06-12 10:27:33 +0200
commit239a64255fae8933d95273b5b92545949ca4e743 (patch)
treefae1b39e23ac3244abbd200c89b1f0c7b72ca044 /arch/s390/mm
parentdab4079d5b5ac421208499d5e554a07f9beb16e4 (diff)
[S390] vmalloc: add vmalloc kernel parameter support
With the kernel parameter 'vmalloc=<size>' the size of the vmalloc area can be specified. This can be used to increase or decrease the size of the area. Works in the same way as on some other architectures. This can be useful for features which make excessive use of vmalloc and wouldn't work otherwise. The default sizes remain unchanged: 96MB for 31 bit kernels and 1GB for 64 bit kernels. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm')
-rw-r--r--arch/s390/mm/pgtable.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index be6c1cf4ad5..4ca8e826bf3 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -1,7 +1,5 @@
/*
- * arch/s390/mm/pgtable.c
- *
- * Copyright IBM Corp. 2007
+ * Copyright IBM Corp. 2007,2009
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
*/
@@ -53,6 +51,18 @@ void clear_table_pgstes(unsigned long *table)
#endif
+unsigned long VMALLOC_START = VMALLOC_END - VMALLOC_SIZE;
+EXPORT_SYMBOL(VMALLOC_START);
+
+static int __init parse_vmalloc(char *arg)
+{
+ if (!arg)
+ return -EINVAL;
+ VMALLOC_START = (VMALLOC_END - memparse(arg, &arg)) & PAGE_MASK;
+ return 0;
+}
+early_param("vmalloc", parse_vmalloc);
+
unsigned long *crst_table_alloc(struct mm_struct *mm, int noexec)
{
struct page *page = alloc_pages(GFP_KERNEL, ALLOC_ORDER);