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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
parentdab4079d5b5ac421208499d5e554a07f9beb16e4 (diff)
downloadlinux-239a64255fae8933d95273b5b92545949ca4e743.tar.bz2
[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')
-rw-r--r--arch/s390/include/asm/pgtable.h7
-rw-r--r--arch/s390/mm/pgtable.c16
2 files changed, 18 insertions, 5 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 5caddd4f7bed..60a7b1a1702f 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -112,12 +112,15 @@ extern char empty_zero_page[PAGE_SIZE];
* effect, this also makes sure that 64 bit module code cannot be used
* as system call address.
*/
+
+extern unsigned long VMALLOC_START;
+
#ifndef __s390x__
-#define VMALLOC_START 0x78000000UL
+#define VMALLOC_SIZE (96UL << 20)
#define VMALLOC_END 0x7e000000UL
#define VMEM_MAP_END 0x80000000UL
#else /* __s390x__ */
-#define VMALLOC_START 0x3e000000000UL
+#define VMALLOC_SIZE (1UL << 30)
#define VMALLOC_END 0x3e040000000UL
#define VMEM_MAP_END 0x40000000000UL
#endif /* __s390x__ */
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index be6c1cf4ad5a..4ca8e826bf30 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);