linux-kernel - [RFC PATCH v1 04/37] perf util: add mmap_cpu_mask_

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Date:   Sat, 21 Aug 2021 11:19:10 +0200
From:   Riccardo Mancini <rickyman7@...il.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        Riccardo Mancini <rickyman7@...il.com>
Subject: [RFC PATCH v1 04/37] perf util: add mmap_cpu_mask__duplicate function

This patch adds a new function in util/mmap.c to duplicate a mmap_cpu_mask.

This new function will be used in the following patches.

Signed-off-by: Riccardo Mancini <rickyman7@...il.com>
---
 tools/perf/util/mmap.c | 12 ++++++++++++
 tools/perf/util/mmap.h |  3 +++
 2 files changed, 15 insertions(+)

diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
index ab7108d22428b527..9e9a447682cc962c 100644
--- a/tools/perf/util/mmap.c
+++ b/tools/perf/util/mmap.c
@@ -350,3 +350,15 @@ int perf_mmap__push(struct mmap *md, void *to,
 out:
 	return rc;
 }
+
+int mmap_cpu_mask__duplicate(struct mmap_cpu_mask *original,
+				struct mmap_cpu_mask *clone)
+{
+	clone->nbits = original->nbits;
+	clone->bits = bitmap_alloc(original->nbits);
+	if (!clone->bits)
+		return -ENOMEM;
+
+	memcpy(clone->bits, original->bits, MMAP_CPU_MASK_BYTES(original));
+	return 0;
+}
diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h
index 9d5f589f02ae70e1..b4923e587fd7749c 100644
--- a/tools/perf/util/mmap.h
+++ b/tools/perf/util/mmap.h
@@ -63,4 +63,7 @@ size_t mmap__mmap_len(struct mmap *map);
 
 void mmap_cpu_mask__scnprintf(struct mmap_cpu_mask *mask, const char *tag);
 
+int mmap_cpu_mask__duplicate(struct mmap_cpu_mask *original,
+				struct mmap_cpu_mask *clone);
+
 #endif /*__PERF_MMAP_H */
-- 
2.31.1