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authorHeiko Carstens <heiko.carstens@de.ibm.com>2012-10-05 16:52:18 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-10-09 14:17:01 +0200
commitc972cc60c23f5a6309292bfcc91a441743ba027e (patch)
tree04f8fc1d4e78979d28a897a90bba5c3321555967 /arch/s390/kernel/module.c
parent021d48be48481821f6e3f53028915c0571874135 (diff)
downloadop-kernel-dev-c972cc60c23f5a6309292bfcc91a441743ba027e.zip
op-kernel-dev-c972cc60c23f5a6309292bfcc91a441743ba027e.tar.gz
s390/vmalloc: have separate modules area
Add a special module area on top of the vmalloc area, which may be only used for modules and bpf jit generated code. This makes sure that inter module branches will always happen without a trampoline and in addition having all the code within a 2GB frame is branch prediction unit friendly. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/module.c')
-rw-r--r--arch/s390/kernel/module.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/s390/kernel/module.c b/arch/s390/kernel/module.c
index 46412b1..4610dea 100644
--- a/arch/s390/kernel/module.c
+++ b/arch/s390/kernel/module.c
@@ -44,6 +44,17 @@
#define PLT_ENTRY_SIZE 20
#endif /* CONFIG_64BIT */
+#ifdef CONFIG_64BIT
+void *module_alloc(unsigned long size)
+{
+ if (PAGE_ALIGN(size) > MODULES_LEN)
+ return NULL;
+ return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
+ GFP_KERNEL, PAGE_KERNEL, -1,
+ __builtin_return_address(0));
+}
+#endif
+
/* Free memory returned from module_alloc */
void module_free(struct module *mod, void *module_region)
{
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