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. Cc: linux-mm@xxxxxxxxx Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx> Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx> Suggested-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx> --- include/linux/vmalloc.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h index 0221f852a7e1..6c151a0ac02a 100644 --- a/include/linux/vmalloc.h +++ b/include/linux/vmalloc.h @@ -249,4 +249,21 @@ 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); +/* + * These functions can be optionally implemented by an arch in order to + * provide specialized functions for allocating trampoline code. + */ + +#ifdef CONFIG_ARCH_HAS_TEXT_ALLOC +/* + * Allocate memory to be used for trampoline code. + */ +void *text_alloc(unsigned long size); + +/* + * Free memory returned from text_alloc(). + */ +void text_free(void *region); +#endif /* CONFIG_ARCH_HAS_TEXT_ALLOC */ + #endif /* _LINUX_VMALLOC_H */ -- 2.25.1
