linux-kernel - [PATCH] perf report: Fix no libunwind compiled warning break s390 issue

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Message-Id: <20200107191745.18415-1-yao.jin@linux.intel.com>
Date:   Wed,  8 Jan 2020 03:17:45 +0800
From:   Jin Yao <yao.jin@...ux.intel.com>
To:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com
Cc:     Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com, tmricht@...ux.ibm.com,
        Jin Yao <yao.jin@...ux.intel.com>
Subject: [PATCH] perf report: Fix no libunwind compiled warning break s390 issue

Commit 800d3f561659 ("perf report: Add warning when libunwind not compiled in")
breaks the s390 platform. S390 uses libdw-dwarf-unwind for call chain
unwinding and had no support for libunwind.

So the warning "Please install libunwind development packages during the perf build."
caused the confusion even if the call-graph is displayed correctly.

This patch adds checking for HAVE_DWARF_SUPPORT, which is set when
libdw-dwarf-unwind is compiled in.

Fixes: 800d3f561659 ("perf report: Add warning when libunwind not compiled in")

Reviewed-by: Thomas Richter <tmricht@...ux.ibm.com>
Tested-by: Thomas Richter <tmricht@...ux.ibm.com>
Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
---
 tools/perf/builtin-report.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index de988589d99b..66cd97cc8b92 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -412,10 +412,10 @@ static int report__setup_sample_type(struct report *rep)
 				PERF_SAMPLE_BRANCH_ANY))
 		rep->nonany_branch_mode = true;
 
-#ifndef HAVE_LIBUNWIND_SUPPORT
+#if !defined(HAVE_LIBUNWIND_SUPPORT) && !defined(HAVE_DWARF_SUPPORT)
 	if (dwarf_callchain_users) {
-		ui__warning("Please install libunwind development packages "
-			    "during the perf build.\n");
+		ui__warning("Please install libunwind or libdw "
+			    "development packages during the perf build.\n");
 	}
 #endif
 
-- 
2.17.1