Patch "perf symbol: Update symbols__fixup_end()" has been added to the 5.15-stable tree

@@ -217,8 +217,8 @@ again:
 	}
 }
 
-void symbols__fixup_end(struct rb_root_cached *symbols,
-			bool is_kallsyms __maybe_unused)
+/* Update zero-sized symbols using the address of the next symbol */
+void symbols__fixup_end(struct rb_root_cached *symbols, bool is_kallsyms)
 {
 	struct rb_node *nd, *prevnd = rb_first_cached(symbols);
 	struct symbol *curr, *prev;

@@ -232,8 +232,29 @@ void symbols__fixup_end(struct rb_root_c
 		prev = curr;
 		curr = rb_entry(nd, struct symbol, rb_node);
 
-		if (prev->end == prev->start || prev->end != curr->start)
-			arch__symbols__fixup_end(prev, curr);
+		/*
+		 * On some architecture kernel text segment start is located at
+		 * some low memory address, while modules are located at high
+		 * memory addresses (or vice versa).  The gap between end of
+		 * kernel text segment and beginning of first module's text
+		 * segment is very big.  Therefore do not fill this gap and do
+		 * not assign it to the kernel dso map (kallsyms).
+		 *
+		 * In kallsyms, it determines module symbols using '[' character
+		 * like in:
+		 *   ffffffffc1937000 T hdmi_driver_init  [snd_hda_codec_hdmi]
+		 */
+		if (prev->end == prev->start) {
+			/* Last kernel/module symbol mapped to end of page */
+			if (is_kallsyms && (!strchr(prev->name, '[') !=
+					    !strchr(curr->name, '[')))
+				prev->end = roundup(prev->end + 4096, 4096);
+			else
+				prev->end = curr->start;
+
+			pr_debug4("%s sym:%s end:%#" PRIx64 "\n",
+				  __func__, prev->name, prev->end);
+		}
 	}
 
 	/* Last entry */