On Wed, May 10, 2023 at 02:02:41PM +0100, Alan Maguire wrote:
> v1.25 of pahole supports filtering out functions with multiple inconsistent
> function prototypes or optimized-out parameters from the BTF representation.
> These present problems because there is no additional info in BTF saying which
> inconsistent prototype matches which function instance to help guide attachment,
> and functions with optimized-out parameters can lead to incorrect assumptions
> about register contents.
>
> So for now, filter out such functions while adding BTF representations for
> functions that have "."-suffixes (foo.isra.0) but not optimized-out parameters.
> This patch assumes that below linked changes land in pahole for v1.25.
>
> Issues with pahole filtering being too aggressive in removing functions
> appear to be resolved now, but CI and further testing will confirm.
>
> Signed-off-by: Alan Maguire <alan.maguire@xxxxxxxxxx>
Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
jirka
> ---
> scripts/pahole-flags.sh | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/scripts/pahole-flags.sh b/scripts/pahole-flags.sh
> index 1f1f1d397c39..728d55190d97 100755
> --- a/scripts/pahole-flags.sh
> +++ b/scripts/pahole-flags.sh
> @@ -23,5 +23,8 @@ if [ "${pahole_ver}" -ge "124" ]; then
> # see PAHOLE_HAS_LANG_EXCLUDE
> extra_paholeopt="${extra_paholeopt} --lang_exclude=rust"
> fi
> +if [ "${pahole_ver}" -ge "125" ]; then
> + extra_paholeopt="${extra_paholeopt} --skip_encoding_btf_inconsistent_proto --btf_gen_optimized"
> +fi
>
> echo ${extra_paholeopt}
> --
> 2.31.1
>
