[PATCH] riscv: asm/gdb_xml.h: use __maybe_used to make W=1 warnings go away

Pierre-Louis Bossart pierre-louis.bossart at linux.intel.com
Wed Jul 1 14:47:49 EDT 2020

0day/kbuild reports warnings with the ASoC codecs compiled with W=1.

In file included from arch/riscv/include/asm/kgdb.h:109,
                 from include/linux/kgdb.h:20,
                 from include/linux/fb.h:5,
                 from include/drm/drm_crtc.h:31,
                 from sound/soc/codecs/hdmi-codec.c:19:

arch/riscv/include/asm/gdb_xml.h:23:19: warning:
'riscv_gdb_stub_cpuxml' defined but not used [-Wunused-const-variable=]
   23 | static const char riscv_gdb_stub_cpuxml[2048] =
      |                   ^~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/gdb_xml.h:16:19: warning:
'riscv_gdb_stub_target_desc' defined but not used [-Wunused-const-variable=]
   16 | static const char riscv_gdb_stub_target_desc[256] =
      |                   ^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/gdb_xml.h:13:19: warning:
'gdb_xfer_read_cpuxml' defined but not used [-Wunused-const-variable=]
   13 | static const char gdb_xfer_read_cpuxml[39] =
      |                   ^~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/gdb_xml.h:10:19: warning:
'gdb_xfer_read_target' defined but not used [-Wunused-const-variable=]
   10 | static const char gdb_xfer_read_target[31] = "qXfer:features:read:target.xml:";
      |                   ^~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/gdb_xml.h:7:19: warning:
'riscv_gdb_stub_feature' defined but not used [-Wunused-const-variable=]
    7 | static const char riscv_gdb_stub_feature[64] =
      |                   ^~~~~~~~~~~~~~~~~~~~~~

Reported-by: kernel test robot <lkp at intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>

I don't know if this is the right way of solving this issue but this
error is now consistently thrown in kbuild compile-test reports w/

 arch/riscv/include/asm/gdb_xml.h | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/riscv/include/asm/gdb_xml.h b/arch/riscv/include/asm/gdb_xml.h
index 041b45f5b997..c28fc1a1d230 100644
--- a/arch/riscv/include/asm/gdb_xml.h
+++ b/arch/riscv/include/asm/gdb_xml.h
@@ -4,23 +4,23 @@
 #define __ASM_GDB_XML_H_
 #define kgdb_arch_gdb_stub_feature riscv_gdb_stub_feature
-static const char riscv_gdb_stub_feature[64] =
+static __maybe_unused const char riscv_gdb_stub_feature[64] =
-static const char gdb_xfer_read_target[31] = "qXfer:features:read:target.xml:";
+static __maybe_unused const char gdb_xfer_read_target[31] = "qXfer:features:read:target.xml:";
 #ifdef CONFIG_64BIT
-static const char gdb_xfer_read_cpuxml[39] =
+static __maybe_unused const char gdb_xfer_read_cpuxml[39] =
-static const char riscv_gdb_stub_target_desc[256] =
+static __maybe_unused const char riscv_gdb_stub_target_desc[256] =
 "l<?xml version=\"1.0\"?>"
 "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
 "<xi:include href=\"riscv-64bit-cpu.xml\"/>"
-static const char riscv_gdb_stub_cpuxml[2048] =
+static __maybe_unused const char riscv_gdb_stub_cpuxml[2048] =
 "l<?xml version=\"1.0\"?>"
 "<!DOCTYPE feature SYSTEM \"gdb-target.dtd\">"
 "<feature name=\"org.gnu.gdb.riscv.cpu\">"

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