On Tue, 8 Mar 2022 20:38:15 -0800
Ian Rogers <irogers@xxxxxxxxxx> wrote:
> Arithmetic on null pointers is undefined behavior, spotted by C compiler
> sanitizers such as with clang. The builtin offset of is available in all
> recent compilers, so unconditionally use it as discussed for libbpf in:
> https://lore.kernel.org/all/a0a26308-a1d7-a57c-727c-000652a5d246@xxxxxx/
Applied, thanks Ian!
-- Steve
>
> Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
> ---
> tracecmd/include/list.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tracecmd/include/list.h b/tracecmd/include/list.h
> index cf9dd47e..fa0de6df 100644
> --- a/tracecmd/include/list.h
> +++ b/tracecmd/include/list.h
> @@ -6,7 +6,7 @@
> #ifndef __LIST_H
> #define __LIST_H
>
> -#define offset_of(type, field) (long)(&((type *)0)->field)
> +#define offset_of(type, field) __builtin_offsetof(type, field)
> #define container_of(p, type, field) (type *)((long)p - offset_of(type, field))
>
> struct list_head {
|