linux-kernel - [PATCH v1] perf build: Pretend scandirat is missing with msan

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Message-Id: <20240320163244.1287780-1-irogers@google.com>
Date: Wed, 20 Mar 2024 09:32:44 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1] perf build: Pretend scandirat is missing with msan

Memory sanitizer lacks an interceptor for scandirat, reporting all
memory it allocates as uninitialized. Memory sanitizer has a scandir
interceptor so use the fallback function in this case. This allows
perf test to run under memory sanitizer.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/Makefile.config | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 1fe8df97fe88..74e0b17050b5 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -486,7 +486,10 @@ ifdef NO_DWARF
 endif
 
 ifeq ($(feature-scandirat), 1)
-  CFLAGS += -DHAVE_SCANDIRAT_SUPPORT
+  # Ignore having scandirat with memory sanitizer that lacks an interceptor.
+  ifeq ($(filter s% -fsanitize=memory%,$(EXTRA_CFLAGS),),)
+    CFLAGS += -DHAVE_SCANDIRAT_SUPPORT
+  endif
 endif
 
 ifeq ($(feature-sched_getcpu), 1)
-- 
2.44.0.291.gc1ea87d7ee-goog