linux-kernel - [PATCH v2 2/4] perf tools: Extend PRINT_ATTRf to support printing of members with a value of 0

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Date:   Thu, 11 May 2023 07:51:52 +0000
From:   Yang Jihong <yangjihong1@...wei.com>
To:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <jolsa@...nel.org>, <namhyung@...nel.org>, <irogers@...gle.com>,
        <adrian.hunter@...el.com>, <anshuman.khandual@....com>,
        <jesussanp@...gle.com>, <linux-perf-users@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <yangjihong1@...wei.com>
Subject: [PATCH v2 2/4] perf tools: Extend PRINT_ATTRf to support printing of members with a value of 0

When printing attr, members whose value is 0 will not be printed, we want
to print the case where attr->type is 0(PERF_TYPE_HARDWARE), add `_a`
param to PRINT_ATTRf macro to always print member when it is true
No functional change.

Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
---
 tools/perf/util/perf_event_attr_fprintf.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/perf_event_attr_fprintf.c b/tools/perf/util/perf_event_attr_fprintf.c
index 7e5e7b30510d..433029c6afc5 100644
--- a/tools/perf/util/perf_event_attr_fprintf.c
+++ b/tools/perf/util/perf_event_attr_fprintf.c
@@ -80,15 +80,15 @@ static void __p_read_format(char *buf, size_t size, u64 value)
 #define p_branch_sample_type(val) __p_branch_sample_type(buf, BUF_SIZE, val)
 #define p_read_format(val)	__p_read_format(buf, BUF_SIZE, val)
 
-#define PRINT_ATTRn(_n, _f, _p)				\
+#define PRINT_ATTRn(_n, _f, _p, _a)			\
 do {							\
-	if (attr->_f) {					\
+	if (_a || attr->_f) {				\
 		_p(attr->_f);				\
 		ret += attr__fprintf(fp, _n, buf, priv);\
 	}						\
 } while (0)
 
-#define PRINT_ATTRf(_f, _p)	PRINT_ATTRn(#_f, _f, _p)
+#define PRINT_ATTRf(_f, _p)	PRINT_ATTRn(#_f, _f, _p, false)
 
 int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
 			     attr__fprintf_f attr__fprintf, void *priv)
@@ -99,7 +99,7 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
 	PRINT_ATTRf(type, p_unsigned);
 	PRINT_ATTRf(size, p_unsigned);
 	PRINT_ATTRf(config, p_hex);
-	PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned);
+	PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned, false);
 	PRINT_ATTRf(sample_type, p_sample_type);
 	PRINT_ATTRf(read_format, p_read_format);
 
@@ -141,10 +141,10 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
 	PRINT_ATTRf(remove_on_exec, p_unsigned);
 	PRINT_ATTRf(sigtrap, p_unsigned);
 
-	PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
+	PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned, false);
 	PRINT_ATTRf(bp_type, p_unsigned);
-	PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex);
-	PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex);
+	PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex, false);
+	PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex, false);
 	PRINT_ATTRf(branch_sample_type, p_branch_sample_type);
 	PRINT_ATTRf(sample_regs_user, p_hex);
 	PRINT_ATTRf(sample_stack_user, p_unsigned);
-- 
2.30.GIT