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From:   Lukas Bulwahn <lukas.bulwahn@gmail.com>
Date:   Tue, 16 Jul 2019 06:58:15 +0200 (CEST)
To:     Kelsey Skunberg <skunberg.kelsey@gmail.com>
cc:     linux-pci@vger.kernel.org, bhelgaas@google.com,
        linux-kernel@vger.kernel.org,
        linux-kernel-mentees@lists.linuxfoundation.org
Subject: Re: [Linux-kernel-mentees] [PATCH v3] PCI: Remove functions not
 called in include/linux/pci.h
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References: <20190715181312.31403-1-skunberg.kelsey@gmail.com> <20190715203416.37547-1-skunberg.kelsey@gmail.com>
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On Mon, 15 Jul 2019, Kelsey Skunberg wrote:

> Remove the following uncalled functions from include/linux/pci.h:
> 
>         pci_block_cfg_access()
>         pci_block_cfg_access_in_atomic()
>         pci_unblock_cfg_access()
> 
> Functions were added in commit fb51ccbf217c ("PCI: Rework config space
> blocking services"), though no callers were added. Code continues to be
> unused and should be removed.
> 
> Signed-off-by: Kelsey Skunberg <skunberg.kelsey@gmail.com>
> ---
> 
> Changes since v1:
>   - Fixed Signed-off-by line to show full name
> 
> Changes since v2:
>   - Change commit message to reference prior commit properly with the
>     following format:
> 	commit <12-character sha prefix> ("<commit message>")
> 
>  include/linux/pci.h | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index cf380544c700..3c9ba6133bea 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1656,11 +1656,6 @@ static inline void pci_release_regions(struct pci_dev *dev) { }
>  
>  static inline unsigned long pci_address_to_pio(phys_addr_t addr) { return -1; }
>  
> -static inline void pci_block_cfg_access(struct pci_dev *dev) { }
> -static inline int pci_block_cfg_access_in_atomic(struct pci_dev *dev)
> -{ return 0; }
> -static inline void pci_unblock_cfg_access(struct pci_dev *dev) { }
> -
>  static inline struct pci_bus *pci_find_next_bus(const struct pci_bus *from)
>  { return NULL; }
>  static inline struct pci_dev *pci_get_slot(struct pci_bus *bus,
> -- 
> 2.20.1

I just checked with elixir on v5.2 that all three identifiers are never 
referenced beyond its definition in pci.h:

https://elixir.bootlin.com/linux/v5.2/ident/pci_block_cfg_access
https://elixir.bootlin.com/linux/v5.2/ident/pci_block_cfg_access_in_atomic
https://elixir.bootlin.com/linux/v5.2/ident/pci_unblock_cfg_access

So, what it is worth:

Reviewed-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>

Lukas

> 
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