* Re: [PATCH] kbuild: skip per-CPU BTF generation for pahole v1.18-v1.21
[not found] <20210530002536.3193829-1-andrii@kernel.org>
@ 2021-05-31 9:34 ` Mel Gorman
0 siblings, 0 replies; only message in thread
From: Mel Gorman @ 2021-05-31 9:34 UTC (permalink / raw)
To: Andrii Nakryiko
Cc: akpm, bpf, msuchanek, linux-kernel, linux-mm, hritikxx8, jolsa,
kernel-team, Arnaldo Carvalho de Melo, Hao Luo
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@techsingularity.net>
> Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
> Cc: Hao Luo <haoluo@google.com>
> Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
--
Mel Gorman
SUSE Labs
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2021-05-31 9:34 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
[not found] <20210530002536.3193829-1-andrii@kernel.org>
2021-05-31 9:34 ` [PATCH] kbuild: skip per-CPU BTF generation for pahole v1.18-v1.21 Mel Gorman
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).