linux-kernel - [PATCH] perf dwarf-aux: Fix build with HAVE_DWARF_CFI

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Date: Wed,  8 May 2024 15:14:57 +0100
From: James Clark <james.clark@....com>
To: linux-perf-users@...r.kernel.org
Cc: leo.yan@...ux.dev,
	James Clark <james.clark@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] perf dwarf-aux: Fix build with HAVE_DWARF_CFI_SUPPORT

check_allowed_ops() is used from both HAVE_DWARF_GETLOCATIONS_SUPPORT
and HAVE_DWARF_CFI_SUPPORT sections, so move it into the right place so
that it's available when either are defined. This shows up when doing
a static cross compile for arm64:

  $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- LDFLAGS="-static" \
    EXTRA_PERFLIBS="-lexpat"

  util/dwarf-aux.c:1723:6: error: implicit declaration of function 'check_allowed_ops'

Fixes: 55442cc2f22d ("perf dwarf-aux: Check allowed DWARF Ops")
Signed-off-by: James Clark <james.clark@....com>
---
 tools/perf/util/dwarf-aux.c | 56 ++++++++++++++++++-------------------
 1 file changed, 28 insertions(+), 28 deletions(-)

diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c
index c0a492e65388..c9584563cd56 100644
--- a/tools/perf/util/dwarf-aux.c
+++ b/tools/perf/util/dwarf-aux.c
@@ -1215,6 +1215,34 @@ static int offset_from_dwarf_op(Dwarf_Op *op)
 	}
 	return -1;
 }
+
+static bool check_allowed_ops(Dwarf_Op *ops, size_t nops)
+{
+	/* The first op is checked separately */
+	ops++;
+	nops--;
+
+	/*
+	 * It needs to make sure if the location expression matches to the given
+	 * register and offset exactly.  Thus it rejects any complex expressions
+	 * and only allows a few of selected operators that doesn't change the
+	 * location.
+	 */
+	while (nops) {
+		switch (ops->atom) {
+		case DW_OP_stack_value:
+		case DW_OP_deref_size:
+		case DW_OP_deref:
+		case DW_OP_piece:
+			break;
+		default:
+			return false;
+		}
+		ops++;
+		nops--;
+	}
+	return true;
+}
 #endif /* HAVE_DWARF_GETLOCATIONS_SUPPORT || HAVE_DWARF_CFI_SUPPORT */
 
 #ifdef HAVE_DWARF_GETLOCATIONS_SUPPORT
@@ -1395,34 +1423,6 @@ static bool match_var_offset(Dwarf_Die *die_mem, struct find_var_data *data,
 	return true;
 }
 
-static bool check_allowed_ops(Dwarf_Op *ops, size_t nops)
-{
-	/* The first op is checked separately */
-	ops++;
-	nops--;
-
-	/*
-	 * It needs to make sure if the location expression matches to the given
-	 * register and offset exactly.  Thus it rejects any complex expressions
-	 * and only allows a few of selected operators that doesn't change the
-	 * location.
-	 */
-	while (nops) {
-		switch (ops->atom) {
-		case DW_OP_stack_value:
-		case DW_OP_deref_size:
-		case DW_OP_deref:
-		case DW_OP_piece:
-			break;
-		default:
-			return false;
-		}
-		ops++;
-		nops--;
-	}
-	return true;
-}
-
 /* Only checks direct child DIEs in the given scope. */
 static int __die_find_var_reg_cb(Dwarf_Die *die_mem, void *arg)
 {
-- 
2.34.1