On Sun, 6 Sep 2026 06:19:22 +0900
Donggeun Yoo <[email protected]> wrote:
> FGRAPH_MAX_INDEX has no user, and it expands to FGRAPH_INDEX_SIZE and
> FGRAPH_RET_INDEX, neither of which is defined anywhere in the tree. It
> was added in that form by commit 91c46b0aa917 ("function_graph:
> Implement fgraph_reserve_data() and fgraph_retrieve_data()"), which
> introduced the current data word layout under new names, so anything
> referencing it would have failed to build ever since.
>
> Remove it.
>
Looks good to me.
Acked-by: Masami Hiramatsu (Google) <[email protected]>
Thanks!
> Signed-off-by: Donggeun Yoo <[email protected]>
> ---
> Found while reading the shadow stack word layout. The macro is dead in
> both senses: nothing references it, and it could not be used as it is.
>
> Compile-tested only, with CONFIG_FUNCTION_GRAPH_TRACER=y and
> CONFIG_DYNAMIC_FTRACE=y. Removing an unreferenced macro cannot change
> generated code, so there is nothing to test at run time.
>
> kernel/trace/fgraph.c | 3 ---
> 1 file changed, 3 deletions(-)
>
> diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c
> index 40d373d65f9b..ed455b53513b 100644
> --- a/kernel/trace/fgraph.c
> +++ b/kernel/trace/fgraph.c
> @@ -143,9 +143,6 @@ enum {
> #define FGRAPH_DATA_INDEX_MASK GENMASK(FGRAPH_DATA_INDEX_BITS - 1, 0)
> #define FGRAPH_DATA_INDEX_SHIFT (FGRAPH_DATA_SHIFT + FGRAPH_DATA_BITS)
>
> -#define FGRAPH_MAX_INDEX \
> - ((FGRAPH_INDEX_SIZE << FGRAPH_DATA_BITS) + FGRAPH_RET_INDEX)
> -
> #define FGRAPH_ARRAY_SIZE FGRAPH_INDEX_BITS
>
> /*
> --
> 2.53.0
>
--
Masami Hiramatsu (Google) <[email protected]>
