linux-kernel - Re: [PATCH v2] devres: use MACRO instead of function for devm

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Date:   Mon, 11 Dec 2017 16:23:11 +0800
From:   Yisheng Xie <xieyisheng1@...wei.com>
To:     <gregkh@...uxfoundation.org>
CC:     <thomas.lendacky@....com>, <lorenzo.pieralisi@....com>,
        <bp@...e.de>, <tglx@...utronix.de>, <kstewart@...uxfoundation.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] devres: use MACRO instead of function for devm_ioremap

Ping... and sorry to disturb.

Hi maintainers,
Could you please help to review this patch?

Thanks
Yisheng xie

On 2017/11/25 17:23, Yisheng Xie wrote:
> Default ioremap is ioremap_nocache, so devm_ioremap has the same function
> with devm_ioremap_nocache, which may just be killed. However, there are
> many places which use devm_ioremap_nocache, while many use devm_ioremap.
> 
> This patch is to use MACRO for devm_ioremap, which will reduce the size of
> devres.o from 206824 Bytes to 203768 Bytes.
> 
> Signed-off-by: Yisheng Xie <xieyisheng1@...wei.com>
> ---
> v2:
>   * MACRO devm_ioremap instead of devm_ioremap_nocache
> 
>  include/linux/io.h |  4 ++--
>  lib/devres.c       | 30 +-----------------------------
>  2 files changed, 3 insertions(+), 31 deletions(-)
> 
> diff --git a/include/linux/io.h b/include/linux/io.h
> index 32e30e8..3759882 100644
> --- a/include/linux/io.h
> +++ b/include/linux/io.h
> @@ -73,8 +73,6 @@ static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
>  
>  #define IOMEM_ERR_PTR(err) (__force void __iomem *)ERR_PTR(err)
>  
> -void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
> -			   resource_size_t size);
>  void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
>  				   resource_size_t size);
>  void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
> @@ -84,6 +82,8 @@ int check_signature(const volatile void __iomem *io_addr,
>  			const unsigned char *signature, int length);
>  void devm_ioremap_release(struct device *dev, void *res);
>  
> +#define devm_ioremap devm_ioremap_nocache
> +
>  void *devm_memremap(struct device *dev, resource_size_t offset,
>  		size_t size, unsigned long flags);
>  void devm_memunmap(struct device *dev, void *addr);
> diff --git a/lib/devres.c b/lib/devres.c
> index 5f2aedd..ebfaab1 100644
> --- a/lib/devres.c
> +++ b/lib/devres.c
> @@ -16,34 +16,6 @@ static int devm_ioremap_match(struct device *dev, void *res, void *match_data)
>  }
>  
>  /**
> - * devm_ioremap - Managed ioremap()
> - * @dev: Generic device to remap IO address for
> - * @offset: Resource address to map
> - * @size: Size of map
> - *
> - * Managed ioremap().  Map is automatically unmapped on driver detach.
> - */
> -void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
> -			   resource_size_t size)
> -{
> -	void __iomem **ptr, *addr;
> -
> -	ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
> -	if (!ptr)
> -		return NULL;
> -
> -	addr = ioremap(offset, size);
> -	if (addr) {
> -		*ptr = addr;
> -		devres_add(dev, ptr);
> -	} else
> -		devres_free(ptr);
> -
> -	return addr;
> -}
> -EXPORT_SYMBOL(devm_ioremap);
> -
> -/**
>   * devm_ioremap_nocache - Managed ioremap_nocache()
>   * @dev: Generic device to remap IO address for
>   * @offset: Resource address to map
> @@ -153,7 +125,7 @@ void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res)
>  		return IOMEM_ERR_PTR(-EBUSY);
>  	}
>  
> -	dest_ptr = devm_ioremap(dev, res->start, size);
> +	dest_ptr = devm_ioremap_nocache(dev, res->start, size);
>  	if (!dest_ptr) {
>  		dev_err(dev, "ioremap failed for resource %pR\n", res);
>  		devm_release_mem_region(dev, res->start, size);
>