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Date: Mon, 13 Apr 2026 23:47:10 -0700
From: Namhyung Kim <namhyung@kernel.org>
To: hev <r@hev.cc>
Cc: jiny L <leeavianna3@gmail.com>, Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@kernel.org>, Ian Rogers <irogers@google.com>,
	Adrian Hunter <adrian.hunter@intel.com>,
	James Clark <james.clark@linaro.org>,
	linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
	loongarch@lists.linux.dev
Subject: Re: [PATCH] perf loongarch: Fix build failure with
 CONFIG_LIBDW_DWARF_UNWIND
Message-ID: <ad3i7q62HSEYT1up@google.com>
References: <20260414005152.10550-1-r@hev.cc>
 <CANVb8WZXZj1Yqd7foqHBLSHjO73r0Kg62bMbrb--aE8wR3G2hg@mail.gmail.com>
 <CAHirt9jA3G5kRjJbmosttEDkvZhKfx3U6oa63JZOnpEx4Cqb2g@mail.gmail.com>
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In-Reply-To: <CAHirt9jA3G5kRjJbmosttEDkvZhKfx3U6oa63JZOnpEx4Cqb2g@mail.gmail.com>

On Tue, Apr 14, 2026 at 09:18:18AM +0800, hev wrote:
> On Tue, Apr 14, 2026 at 9:13 AM jiny L <leeavianna3@gmail.com> wrote:
> >
> >
> >
> > On Mon, Apr 13, 2026 at 5:52 PM WANG Rui <r@hev.cc> wrote:
> >>
> >> Building perf for LoongArch fails when CONFIG_LIBDW_DWARF_UNWIND is
> >> enabled because unwind-libdw.o is still referenced in
> >> arch/loongarch/util/Build.
> >>
> >> Fixes: e62fae9d9e8 ("perf unwind-libdw: Fix a cross-arch unwinding bug")
> >> Signed-off-by: WANG Rui <r@hev.cc>
> >> ---
> >>  tools/perf/arch/loongarch/util/Build | 1 -
> >>  1 file changed, 1 deletion(-)
> >>
> >> diff --git a/tools/perf/arch/loongarch/util/Build b/tools/perf/arch/loongarch/util/Build
> >> index 3ad73d0289f3..8d91e78d31c9 100644
> >> --- a/tools/perf/arch/loongarch/util/Build
> >> +++ b/tools/perf/arch/loongarch/util/Build
> >> @@ -1,4 +1,3 @@
> >>  perf-util-y += header.o
> >>
> >>  perf-util-$(CONFIG_LOCAL_LIBUNWIND) += unwind-libunwind.o
> >> -perf-util-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
> >> --
> >> 2.53.0
> >>
> >>
> >
> > I happened to have the same build issue on linux 7.0 and I found there is already a patch fixing this  https://lore.kernel.org/lkml/20260413024805.1316480-3-irogers@google.com/
> 
> Thanks for the reference.
> Rui

As the Ian's series is still under review, I'd pick this one instead.

Thanks,
Namhyung