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s390/vmalloc: have separate modules area

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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>
This commit is contained in:
Heiko Carstens
2012-10-05 16:52:18 +02:00
committed by Martin Schwidefsky
parent 021d48be48
commit c972cc60c2
4 changed files with 46 additions and 12 deletions
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11
arch/s390/kernel/module.c
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@@ -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)
{