linux-kernel - [PATCH] riscv: asm/gdb_xml.h: use __maybe

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Date:   Wed,  1 Jul 2020 13:47:49 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     alsa-devel@...a-project.org
Cc:     tiwai@...e.de, broonie@...nel.org,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        kernel test robot <lkp@...el.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Vincent Chen <vincent.chen@...ive.com>,
        linux-riscv@...ts.infradead.org (open list:RISC-V ARCHITECTURE),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] riscv: asm/gdb_xml.h: use __maybe_used to make W=1 warnings go away

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@...el.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.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/
W=1.

 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] =
 			"PacketSize=800;qXfer:features:read+;";
 
-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] =
 			"qXfer:features:read:riscv-64bit-cpu.xml";
 
-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\">"
 "<target>"
 "<xi:include href=\"riscv-64bit-cpu.xml\"/>"
 "</target>";
 
-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\">"
-- 
2.25.1