linux-kernel - [PATCH v1 6/6] perf test: Make watchpoint data 32-bits on i386

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Message-Id: <20240831070415.506194-7-irogers@google.com>
Date: Sat, 31 Aug 2024 00:04:15 -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>, 
	Kan Liang <kan.liang@...ux.intel.com>, Athira Rajeev <atrajeev@...ux.vnet.ibm.com>, 
	Dominique Martinet <asmadeus@...ewreck.org>, Yang Jihong <yangjihong@...edance.com>, 
	Colin Ian King <colin.i.king@...il.com>, Chaitanya S Prakash <chaitanyas.prakash@....com>, 
	"Masami Hiramatsu (Google)" <mhiramat@...nel.org>, James Clark <james.clark@...aro.org>, 
	John Garry <john.g.garry@...cle.com>, Junhao He <hejunhao3@...wei.com>, 
	David Ahern <dsa@...ulusnetworks.com>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 6/6] perf test: Make watchpoint data 32-bits on i386

i386 only supports watchpoints up to size 4, 8 bytes causes extra
counts and test failures.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/tests/wp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/perf/tests/wp.c b/tools/perf/tests/wp.c
index cc8719609b19..6c178985e37f 100644
--- a/tools/perf/tests/wp.c
+++ b/tools/perf/tests/wp.c
@@ -20,7 +20,12 @@ do {                                            \
 	TEST_ASSERT_VAL(text, count == val);    \
 } while (0)
 
+#ifdef __i386__
+/* Only breakpoint length less-than 8 has hardware support on i386. */
+volatile u32 data1;
+#else
 volatile u64 data1;
+#endif
 volatile u8 data2[3];
 
 #ifndef __s390x__
-- 
2.46.0.469.g59c65b2a67-goog