[PATCH v3] x86/pmc_atom: Fix warning when CONFIG_DEBUG_FS=n

[PATCH v3] x86/pmc_atom: Fix warning when CONFIG_DEBUG_FS=n

[Martin Kelly]

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@amazon.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

Re: [PATCH v3] x86/pmc_atom: Fix warning when CONFIG_DEBUG_FS=n

[Li, Aubrey]

On 2014/9/17 22:17, Martin Kelly wrote:
> 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@amazon.com>

Looks good to me, thanks Martin!

> ---
> 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;
>  }
>  
>  /*
> 

[tip:x86/platform] x86/platform/pmc_atom: Fix warning when CONFIG_DEBUG_FS=n

[tip-bot for Martin Kelly]

Commit-ID:  9575a6a23a8081bc4c9d47d001621e2af0957c02
Gitweb:     http://git.kernel.org/tip/9575a6a23a8081bc4c9d47d001621e2af0957c02
Author:     Martin Kelly <martin@martingkelly.com>
AuthorDate: Wed, 17 Sep 2014 07:17:56 -0700
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Fri, 19 Sep 2014 13:02:21 +0200

x86/platform/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@amazon.com>
Acked-by: "Li, Aubrey" <aubrey.li@linux.intel.com>
Cc: vishwesh.m.rudramuni@intel.com
Link: http://lkml.kernel.org/r/1410963476-8360-1-git-send-email-martin@martingkelly.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 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;
 }
 
 /*