linux-kernel - [PATCH] perf arm-spe: Only warn once for each unsupported address packet

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230127205546.667740-1-robh@kernel.org>
Date:   Fri, 27 Jan 2023 14:55:46 -0600
From:   Rob Herring <robh@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Cc:     James Clark <james.clark@....com>, Will Deacon <will@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] perf arm-spe: Only warn once for each unsupported address packet

Unknown address packet indexes are not an error as the Arm architecture
can (and has with SPEv1.2) define new ones and implementation defined
ones are also allowed. The error message for every occurrence of the
packet is needlessly noisy as well. Change the message to print just
once for each unknown index.

Signed-off-by: Rob Herring <robh@...nel.org>
---
 tools/perf/util/arm-spe-decoder/arm-spe-decoder.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c b/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c
index 091987dd3966..40dcedfd75cd 100644
--- a/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c
+++ b/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c
@@ -68,7 +68,11 @@ static u64 arm_spe_calc_ip(int index, u64 payload)
 		/* Clean highest byte */
 		payload = SPE_ADDR_PKT_ADDR_GET_BYTES_0_6(payload);
 	} else {
-		pr_err("unsupported address packet index: 0x%x\n", index);
+		static u32 seen_idx = 0;
+		if (!(seen_idx & BIT(index))) {
+			seen_idx |= BIT(index);
+			pr_warning("ignoring unsupported address packet index: 0x%x\n", index);
+		}
 	}
 
 	return payload;
-- 
2.39.0