On Fri, 17 Jul 2020 06:04:17 +0300
Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx> wrote:
> 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().
Doesn't it depend on CONFIG_MODULE?
Thank you,
>
> 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 | 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
>
--
Masami Hiramatsu <mhiramat@xxxxxxxxxx>
