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-rw-r--r--tools/bpf/bpftool/json_writer.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/tools/bpf/bpftool/json_writer.c b/tools/bpf/bpftool/json_writer.c
index c6eef76322ae..bff7ee026680 100644
--- a/tools/bpf/bpftool/json_writer.c
+++ b/tools/bpf/bpftool/json_writer.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/*
* Simple streaming JSON writer
*
@@ -19,6 +20,7 @@
#include <malloc.h>
#include <inttypes.h>
#include <stdint.h>
+#include <linux/compiler.h>
#include "json_writer.h"
@@ -156,7 +158,8 @@ void jsonw_name(json_writer_t *self, const char *name)
putc(' ', self->out);
}
-void jsonw_vprintf_enquote(json_writer_t *self, const char *fmt, va_list ap)
+void __printf(2, 0)
+jsonw_vprintf_enquote(json_writer_t *self, const char *fmt, va_list ap)
{
jsonw_eor(self);
putc('"', self->out);
@@ -164,7 +167,7 @@ void jsonw_vprintf_enquote(json_writer_t *self, const char *fmt, va_list ap)
putc('"', self->out);
}
-void jsonw_printf(json_writer_t *self, const char *fmt, ...)
+void __printf(2, 3) jsonw_printf(json_writer_t *self, const char *fmt, ...)
{
va_list ap;