From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 tools/perf/util/pstack.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 tools/perf/util/pstack.c

(limited to 'tools/perf/util/pstack.c')

diff --git a/tools/perf/util/pstack.c b/tools/perf/util/pstack.c
new file mode 100644
index 000000000..a1d1e4ef6
--- /dev/null
+++ b/tools/perf/util/pstack.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Simple pointer stack
+ *
+ * (c) 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
+ */
+
+#include "pstack.h"
+#include "debug.h"
+#include <linux/kernel.h>
+#include <linux/zalloc.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct pstack {
+	unsigned short	top;
+	unsigned short	max_nr_entries;
+	void		*entries[];
+};
+
+struct pstack *pstack__new(unsigned short max_nr_entries)
+{
+	struct pstack *pstack = zalloc((sizeof(*pstack) +
+				       max_nr_entries * sizeof(void *)));
+	if (pstack != NULL)
+		pstack->max_nr_entries = max_nr_entries;
+	return pstack;
+}
+
+void pstack__delete(struct pstack *pstack)
+{
+	free(pstack);
+}
+
+bool pstack__empty(const struct pstack *pstack)
+{
+	return pstack->top == 0;
+}
+
+void pstack__remove(struct pstack *pstack, void *key)
+{
+	unsigned short i = pstack->top, last_index = pstack->top - 1;
+
+	while (i-- != 0) {
+		if (pstack->entries[i] == key) {
+			if (i < last_index)
+				memmove(pstack->entries + i,
+					pstack->entries + i + 1,
+					(last_index - i) * sizeof(void *));
+			--pstack->top;
+			return;
+		}
+	}
+	pr_err("%s: %p not on the pstack!\n", __func__, key);
+}
+
+void pstack__push(struct pstack *pstack, void *key)
+{
+	if (pstack->top == pstack->max_nr_entries) {
+		pr_err("%s: top=%d, overflow!\n", __func__, pstack->top);
+		return;
+	}
+	pstack->entries[pstack->top++] = key;
+}
+
+void *pstack__pop(struct pstack *pstack)
+{
+	void *ret;
+
+	if (pstack->top == 0) {
+		pr_err("%s: underflow!\n", __func__);
+		return NULL;
+	}
+
+	ret = pstack->entries[--pstack->top];
+	pstack->entries[pstack->top] = NULL;
+	return ret;
+}
+
+void *pstack__peek(struct pstack *pstack)
+{
+	if (pstack->top == 0)
+		return NULL;
+	return pstack->entries[pstack->top - 1];
+}
-- 
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