Introduce functions for allocating memory for dynamic trampolines, such as kprobes. An arch can promote the availability of these functions with CONFIG_ARCH_HAS_TEXT_ALLOC. Provide default/fallback implementation wrapping module_alloc() and module_memfree().
Cc: Andi Kleen <[email protected]> Cc: Masami Hiramatsu <[email protected]> Suggested-by: Peter Zijlstra <[email protected]> Signed-off-by: Jarkko Sakkinen <[email protected]> --- include/linux/vmalloc.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h index 0221f852a7e1..e981436e30b6 100644 --- a/include/linux/vmalloc.h +++ b/include/linux/vmalloc.h @@ -9,6 +9,7 @@ #include <asm/page.h> /* pgprot_t */ #include <linux/rbtree.h> #include <linux/overflow.h> +#include <linux/moduleloader.h> #include <asm/vmalloc.h> @@ -249,4 +250,26 @@ pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms) int register_vmap_purge_notifier(struct notifier_block *nb); int unregister_vmap_purge_notifier(struct notifier_block *nb); +#ifdef CONFIG_ARCH_HAS_TEXT_ALLOC +/* + * Allocate memory to be used for dynamic trampoline code. + */ +void *text_alloc(unsigned long size); + +/* + * Free memory returned from text_alloc(). + */ +void text_free(void *region); +#else +static inline void *text_alloc(unsigned long size) +{ + return module_alloc(size); +} + +static inline void text_free(void *region) +{ + module_memfree(region); +} +#endif + #endif /* _LINUX_VMALLOC_H */ -- 2.25.1
