linux-kernel - [PATCH v1 1/6] perf header: Replace hardcoded max cpus by MAX_NR

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Message-ID: <20260127185000.431884-2-swapnil.sapkal@amd.com>
Date: Tue, 27 Jan 2026 18:49:55 +0000
From: Swapnil Sapkal <swapnil.sapkal@....com>
To: <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
	<namhyung@...nel.org>, <irogers@...gle.com>, <james.clark@....com>
CC: <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
	<jolsa@...nel.org>, <adrian.hunter@...el.com>, <thomas.falcon@...el.com>,
	<ashelat@...hat.com>, <yu.c.chen@...el.com>, <sshegde@...ux.ibm.com>,
	<gautham.shenoy@....com>, <ravi.bangoria@....com>, <swapnil.sapkal@....com>,
	<linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>
Subject: [PATCH v1 1/6] perf header: Replace hardcoded max cpus by MAX_NR_CPUS

cpumask and cpulist from cpu-domain header have hardcoded max_cpus value
of 1024. Current systems have more cpus than this value. Replace it with
MAX_NR_CPUS. Also define a macro to represent domain name length.

Fixes: d40c68a49f69 ("perf header: Support CPU DOMAIN relation info")
Reported-by: Shrikanth Hegde <sshegde@...ux.ibm.com>
Signed-off-by: Swapnil Sapkal <swapnil.sapkal@....com>
---
 tools/perf/util/header.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index eefd1cd73b6a..31c3bab1b10a 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -76,6 +76,7 @@ static const u64 __perf_magic2    = 0x32454c4946524550ULL;
 static const u64 __perf_magic2_sw = 0x50455246494c4532ULL;
 
 #define PERF_MAGIC	__perf_magic2
+#define DNAME_LEN	16
 
 const char perf_version_string[] = PERF_VERSION;
 
@@ -1616,10 +1617,10 @@ static int write_pmu_caps(struct feat_fd *ff,
 
 struct cpu_domain_map **build_cpu_domain_map(u32 *schedstat_version, u32 *max_sched_domains, u32 nr)
 {
+	char dname[DNAME_LEN], cpumask[MAX_NR_CPUS];
 	struct domain_info *domain_info;
 	struct cpu_domain_map **cd_map;
-	char dname[16], cpumask[256];
-	char cpulist[1024];
+	char cpulist[MAX_NR_CPUS];
 	char *line = NULL;
 	u32 cpu, domain;
 	u32 dcount = 0;
-- 
2.43.0