[PATCH 5.10 114/129] perf symbol: Update symbols__fixup_end()

[Greg Kroah-Hartman]

From: Namhyung Kim <namhyung at kernel.org>

commit 8799ebce84d672aae1dc3170510f6a3e66f96b11 upstream.

Now arch-specific functions all do the same thing.  When it fixes the
symbol address it needs to check the boundary between the kernel image
and modules.  For the last symbol in the previous region, it cannot
know the exact size as it's discarded already.  Thus it just uses a
small page size (4096) and rounds it up like the last symbol.

Fixes: 3cf6a32f3f2a4594 ("perf symbols: Fix symbol size calculation condition")
Signed-off-by: Namhyung Kim <namhyung at kernel.org>
Acked-by: Ian Rogers <irogers at google.com>
Cc: Heiko Carstens <hca at linux.ibm.com>
Cc: Ingo Molnar <mingo at kernel.org>
Cc: Jiri Olsa <jolsa at kernel.org>
Cc: John Garry <john.garry at huawei.com>
Cc: Leo Yan <leo.yan at linaro.org>
Cc: Mark Rutland <mark.rutland at arm.com>
Cc: Masami Hiramatsu <mhiramat at kernel.org>
Cc: Mathieu Poirier <mathieu.poirier at linaro.org>
Cc: Michael Ellerman <mpe at ellerman.id.au>
Cc: Michael Petlan <mpetlan at redhat.com>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: Song Liu <songliubraving at fb.com>
Cc: Will Deacon <will at kernel.org>
Cc: linux-s390 at vger.kernel.org
Cc: linuxppc-dev at lists.ozlabs.org
Link: https://lore.kernel.org/r/20220416004048.1514900-3-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme at redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 tools/perf/util/symbol.c |   29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -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 */