linux-kernel - [PATCH 2/5] perf intel-pt: Simplify intel_pt_get

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Date:   Thu,  5 Oct 2023 22:04:48 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: [PATCH 2/5] perf intel-pt: Simplify intel_pt_get_vmcs()

Simplify and remove unnecessary constant expressions.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 .../util/intel-pt-decoder/intel-pt-pkt-decoder.c    | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-pkt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-pkt-decoder.c
index af9710622a1f..249610cc9284 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-pkt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-pkt-decoder.c
@@ -131,19 +131,14 @@ static int intel_pt_get_cbr(const unsigned char *buf, size_t len,
 static int intel_pt_get_vmcs(const unsigned char *buf, size_t len,
 			     struct intel_pt_pkt *packet)
 {
-	unsigned int count = (52 - 5) >> 3;
-
-	if (count < 1 || count > 7)
-		return INTEL_PT_BAD_PACKET;
-
-	if (len < count + 2)
+	if (len < 7)
 		return INTEL_PT_NEED_MORE_BYTES;
 
 	packet->type = INTEL_PT_VMCS;
-	packet->count = count;
-	memcpy_le64(&packet->payload, buf + 2, count);
+	packet->count = 5;
+	memcpy_le64(&packet->payload, buf + 2, 5);
 
-	return count + 2;
+	return 7;
 }
 
 static int intel_pt_get_ovf(struct intel_pt_pkt *packet)
-- 
2.34.1