On Sat, May 29, 2021 at 05:25:36PM -0700, Andrii Nakryiko wrote: > Commit "mm/page_alloc: convert per-cpu list protection to local_lock" > introduced a zero-sized per-CPU variable, which causes pahole to generate > invalid BTF. Only pahole versions 1.18 through 1.21 are impacted, as before > 1.18 pahole doesn't know anything about per-CPU variables, and 1.22 contains > the proper fix for the issue. > > Luckily, pahole 1.18 got --skip_encoding_btf_vars option disabling BTF > generation for per-CPU variables in anticipation of some unanticipated > problems. So use this escape hatch to disable per-CPU var BTF info on those > problematic pahole versions. Users relying on availability of per-CPU var BTFs > would need to upgrade to pahole 1.22+, but everyone won't notice any > regressions. > > Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> > Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> > Cc: Hao Luo <haoluo@xxxxxxxxxx> > Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx> Acked-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> -- Mel Gorman SUSE Labs
