Re: [PATCH 2/3] random: Return nbytes filled from hw RNG

[Steven Rostedt <rostedt@goodmis.org>]

On Wed,  2 May 2018 09:33:39 +1000
"Tobin C. Harding" <me@tobin.cc> wrote:

> diff --git a/drivers/char/random.c b/drivers/char/random.c
> index 031d18b31e0f..3a66507ea60b 100644
> --- a/drivers/char/random.c
> +++ b/drivers/char/random.c
> @@ -1725,26 +1725,28 @@ EXPORT_SYMBOL(del_random_ready_callback);
>   * key known by the NSA).  So it's useful if we need the speed, but
>   * only if we're willing to trust the hardware manufacturer not to
>   * have put in a back door.
> + *
> + * Return number of bytes filled in.
>   */
> -void get_random_bytes_arch(void *buf, int nbytes)
> +int __must_check get_random_bytes_arch(void *buf, int nbytes)

The "__must_check" makes no sense in the C file. It belongs in the
header file. There wont be any complaint about it here.

-- Steve


>  {
>  	char *p = buf;



> diff --git a/include/linux/random.h b/include/linux/random.h
> index 2ddf13b4281e..308168c0a637 100644
> --- a/include/linux/random.h
> +++ b/include/linux/random.h
> @@ -38,7 +38,7 @@ extern void get_random_bytes(void *buf, int nbytes);
>  extern int wait_for_random_bytes(void);
>  extern int add_random_ready_callback(struct random_ready_callback *rdy);
>  extern void del_random_ready_callback(struct random_ready_callback *rdy);
> -extern void get_random_bytes_arch(void *buf, int nbytes);
> +extern int get_random_bytes_arch(void *buf, int nbytes);
>  
>  #ifndef MODULE
>  extern const struct file_operations random_fops, urandom_fops;