linux-kernel - [PATCH v3] x86/pmc_atom: Fix warning when CONFIG_DEBUG

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Date:	Wed, 17 Sep 2014 07:17:56 -0700
From:	Martin Kelly <martin@...tingkelly.com>
To:	x86@...nel.org, mingo@...hat.com
Cc:	vishwesh.m.rudramuni@...el.com, joe@...ches.com,
	hpa@...ux.intel.com, aubrey.li@...ux.intel.com,
	linux-kernel@...r.kernel.org,
	Martin Kelly <martin@...tingkelly.com>,
	Martin Kelly <martkell@...zon.com>
Subject: [PATCH v3] x86/pmc_atom: Fix warning when CONFIG_DEBUG_FS=n

When compiling with CONFIG_DEBUG_FS=n, gcc emits an unused variable
warning for pmc_atom.c because "ret" is used only within the
CONFIG_DEBUG_FS block. This patch adds a dummy #ifdef for
pmc_dbgfs_register when CONFIG_DEBUG_FS=n to simplify the code and
remove the warning.

Signed-off-by: Martin Kelly <martkell@...zon.com>
---
Changes in v3:
  - Further unified the return code logic, as suggested by Ingo Molnar

Changes in v2:
  - Implemented Ingo Molnar's suggestion to #ifdef the function rather
    than the lines.
---
 arch/x86/kernel/pmc_atom.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/pmc_atom.c b/arch/x86/kernel/pmc_atom.c
index 0c424a6..0ee5025e 100644
--- a/arch/x86/kernel/pmc_atom.c
+++ b/arch/x86/kernel/pmc_atom.c
@@ -235,6 +235,11 @@ err:
 	pmc_dbgfs_unregister(pmc);
 	return -ENODEV;
 }
+#else
+static int pmc_dbgfs_register(struct pmc_dev *pmc, struct pci_dev *pdev)
+{
+	return 0;
+}
 #endif /* CONFIG_DEBUG_FS */
 
 static int pmc_setup_dev(struct pci_dev *pdev)
@@ -262,14 +267,12 @@ static int pmc_setup_dev(struct pci_dev *pdev)
 	/* PMC hardware registers setup */
 	pmc_hw_reg_setup(pmc);
 
-#ifdef CONFIG_DEBUG_FS
 	ret = pmc_dbgfs_register(pmc, pdev);
 	if (ret) {
 		iounmap(pmc->regmap);
-		return ret;
 	}
-#endif /* CONFIG_DEBUG_FS */
-	return 0;
+
+	return ret;
 }
 
 /*
-- 
2.1.0

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