linux-kernel - [PATCH v2] ALSA: hda: fix unused variable warning

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Message-Id: <20180911141836.14463-1-anders.roxell@linaro.org>
Date:   Tue, 11 Sep 2018 16:18:36 +0200
From:   Anders Roxell <anders.roxell@...aro.org>
To:     perex@...ex.cz, tiwai@...e.com
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Anders Roxell <anders.roxell@...aro.org>
Subject: [PATCH v2] ALSA: hda: fix unused variable warning

When CONFIG_X86=n function azx_snoop doesn't use the variable chip it
only returns true.

sound/pci/hda/hda_intel.c: In function ‘dma_alloc_pages’:
sound/pci/hda/hda_intel.c:2002:14: warning: unused variable ‘chip’ [-Wunused-variable]
  struct azx *chip = bus_to_azx(bus);
              ^~~~

Create a inline function of azx_snoop.

Fixes: a41d122449be ("ALSA: hda - Embed bus into controller object")
Signed-off-by: Anders Roxell <anders.roxell@...aro.org>
---
 sound/pci/hda/hda_controller.h | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/sound/pci/hda/hda_controller.h b/sound/pci/hda/hda_controller.h
index 0053b704ddc4..c95097bb5a0c 100644
--- a/sound/pci/hda/hda_controller.h
+++ b/sound/pci/hda/hda_controller.h
@@ -170,11 +170,10 @@ struct azx {
 #define azx_bus(chip)	(&(chip)->bus.core)
 #define bus_to_azx(_bus)	container_of(_bus, struct azx, bus.core)
 
-#ifdef CONFIG_X86
-#define azx_snoop(chip)		((chip)->snoop)
-#else
-#define azx_snoop(chip)		true
-#endif
+static inline bool azx_snoop(struct azx *chip)
+{
+	return !IS_ENABLED(CONFIG_X86) || chip->snoop;
+}
 
 /*
  * macros for easy use
-- 
2.18.0