linux-kernel - Re: [PATCH] PCI/PTM: Build debugfs code only if CONFIG_DEBUG

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Message-ID: <5cf7045f-f199-492b-9e4d-8de9664a585d@linux.intel.com>
Date: Mon, 9 Jun 2025 15:33:03 -0700
From: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@...ux.intel.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
 bhelgaas@...gle.com
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
 Eric Biggers <ebiggers@...nel.org>
Subject: Re: [PATCH] PCI/PTM: Build debugfs code only if CONFIG_DEBUG_FS is
 enabled


On 6/7/25 8:33 PM, Manivannan Sadhasivam wrote:
> Otherwise, the following build error will happen for CONFIG_DEBUG_FS=n &&
> CONFIG_PCIE_PTM=y.
>
>      drivers/pci/pcie/ptm.c:498:25: error: redefinition of 'pcie_ptm_create_debugfs'
>        498 | struct pci_ptm_debugfs *pcie_ptm_create_debugfs(struct device *dev, void *pdata,
>            |                         ^
>      ./include/linux/pci.h:1915:2: note: previous definition is here
>       1915 | *pcie_ptm_create_debugfs(struct device *dev, void *pdata,
>            |  ^
>      drivers/pci/pcie/ptm.c:546:6: error: redefinition of 'pcie_ptm_destroy_debugfs'
>        546 | void pcie_ptm_destroy_debugfs(struct pci_ptm_debugfs *ptm_debugfs)
>            |      ^
>      ./include/linux/pci.h:1918:1: note: previous definition is here
>       1918 | pcie_ptm_destroy_debugfs(struct pci_ptm_debugfs *ptm_debugfs) { }
>            |
>
> Fixes: 132833405e61 ("PCI: Add debugfs support for exposing PTM context")
> Reported-by: Eric Biggers <ebiggers@...nel.org>
> Closes: https://lore.kernel.org/linux-pci/20250607025506.GA16607@sol
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---

Looks good to me.

Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
>   drivers/pci/pcie/ptm.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/drivers/pci/pcie/ptm.c b/drivers/pci/pcie/ptm.c
> index ee5f615a9023..4bd73f038ffb 100644
> --- a/drivers/pci/pcie/ptm.c
> +++ b/drivers/pci/pcie/ptm.c
> @@ -254,6 +254,7 @@ bool pcie_ptm_enabled(struct pci_dev *dev)
>   }
>   EXPORT_SYMBOL(pcie_ptm_enabled);
>   
> +#if IS_ENABLED(CONFIG_DEBUG_FS)
>   static ssize_t context_update_write(struct file *file, const char __user *ubuf,
>   			     size_t count, loff_t *ppos)
>   {
> @@ -552,3 +553,4 @@ void pcie_ptm_destroy_debugfs(struct pci_ptm_debugfs *ptm_debugfs)
>   	debugfs_remove_recursive(ptm_debugfs->debugfs);
>   }
>   EXPORT_SYMBOL_GPL(pcie_ptm_destroy_debugfs);
> +#endif

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer