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Date: Sat, 13 Jan 2018 17:39:18 +0100
From: christophe leroy <christophe.leroy@....fr>
To: Yisheng Xie <xieyisheng1@...wei.com>, gregkh@...uxfoundation.org
Cc: linux-kernel@...r.kernel.org, thomas.lendacky@....com
Subject: Re: [PATCH v4] devres: combine function devm_ioremap*
Hi Yisheng,
Le 12/01/2018 à 12:51, Yisheng Xie a écrit :
> When I tried to use devm_ioremap function and review related
> code, I found devm_ioremap_* almost have the similar realize
> with each other, which can be combined.
>
> In the former versions, I have tried to kill ioremap_cache to
> reduce the size of devres, which can not work for ioremap is
> not the same as ioremap_nocache in some ARCHs likes ia64.
> Therefore, as the suggestion of Christophe, I introduce a help
> function __devm_ioremap, let devm_ioremap* inline and call
> __devm_ioremap with different devm_ioremap_type.
>
> After apply the patch, the size of devres.o can be reduce from
> 8216 Bytes to 7352Bytes in my compile environment.
>
> Suggested-by: Christophe LEROY <christophe.leroy@....fr>
> Signed-off-by: Yisheng Xie <xieyisheng1@...wei.com>
> ---
> v2:
> - use MARCO for ioremap
> v3:
> - kill dev_ioremap_nocache
> v4:
> - combine function devm_ioremap*
>
> include/linux/io.h | 33 +++++++++++++++++++-----
> lib/devres.c | 76 +++++++++++-------------------------------------------
> 2 files changed, 42 insertions(+), 67 deletions(-)
>
> diff --git a/include/linux/io.h b/include/linux/io.h
> index 32e30e8..da33a5f 100644
> --- a/include/linux/io.h
> +++ b/include/linux/io.h
> @@ -73,12 +73,33 @@ 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,
> - resource_size_t size);
> +typedef enum {
> + DEVM_IOREMAP = 0,
> + DEVM_IOREMAP_NC,
> + DEVM_IOREMAP_WC,
> +} devm_ioremap_type;
In accordance with Kernel codying style, you should not define a new
typedef for that.
Instead, use:
enum devm_ioremap_type {
DEVM_IOREMAP = 0,
DEVM_IOREMAP_NC,
DEVM_IOREMAP_WC,
};
> +
> +void __iomem *__devm_ioremap(struct device *dev, resource_size_t offset,
> + resource_size_t size, devm_ioremap_type type);
Use 'enum devm_ioremap_type type' instead of 'devm_ioremap_type'
And alignment of second line should match open parenthesis.
> +
> +static inline void __iomem *devm_ioremap(struct device *dev,
> + resource_size_t offset, resource_size_t size)
Alignment of second line should match open parenthesis.
> +{
> + return __devm_ioremap(dev, offset, size, DEVM_IOREMAP);
> +}
> +
> +static inline void __iomem *devm_ioremap_nocache(struct device *dev,
> + resource_size_t offset, resource_size_t size)
Alignment of second line should match open parenthesis.
> +{
> + return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_NC);
> +}
> +
> +static inline void __iomem *devm_ioremap_wc(struct device *dev,
> + resource_size_t offset, resource_size_t size)
Alignment of second line should match open parenthesis.
> +{
> + return __devm_ioremap(dev, offset, size, DEVM_IOREMAP_WC);
> +}
> +
> void devm_iounmap(struct device *dev, void __iomem *addr);
> int check_signature(const volatile void __iomem *io_addr,
> const unsigned char *signature, int length);
> diff --git a/lib/devres.c b/lib/devres.c
> index 5f2aedd..e00eb4f 100644
> --- a/lib/devres.c
> +++ b/lib/devres.c
> @@ -23,73 +23,27 @@ static int devm_ioremap_match(struct device *dev, void *res, void *match_data)
> *
> * Managed ioremap(). Map is automatically unmapped on driver detach.
> */
That comment should be moved to io.h
> -void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
> - resource_size_t size)
> +void __iomem *__devm_ioremap(struct device *dev, resource_size_t offset,
> + resource_size_t size, devm_ioremap_type type)
Alignment of second line should match open parenthesis.
> {
> - 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
> - * @size: Size of map
> - *
> - * Managed ioremap_nocache(). Map is automatically unmapped on driver
> - * detach.
> - */
That comment should be moved to io.h
> -void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
> - resource_size_t size)
> -{
> - void __iomem **ptr, *addr;
> + void __iomem **ptr, *addr = NULL;
>
> ptr = devres_alloc(devm_ioremap_release, sizeof(*ptr), GFP_KERNEL);
> if (!ptr)
> return NULL;
>
> - addr = ioremap_nocache(offset, size);
> - if (addr) {
> - *ptr = addr;
> - devres_add(dev, ptr);
> - } else
> - devres_free(ptr);
> -
> - return addr;
> -}
> -EXPORT_SYMBOL(devm_ioremap_nocache);
> -
> -/**
> - * devm_ioremap_wc - Managed ioremap_wc()
> - * @dev: Generic device to remap IO address for
> - * @offset: Resource address to map
> - * @size: Size of map
> - *
> - * Managed ioremap_wc(). Map is automatically unmapped on driver detach.
> - */
That comment should be moved to io.h
> -void __iomem *devm_ioremap_wc(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;
> + switch (type) {
> + case DEVM_IOREMAP:
> + addr = ioremap(offset, size);
> + break;
> + case DEVM_IOREMAP_NC:
> + addr = ioremap_nocache(offset, size);
> + break;
> + case DEVM_IOREMAP_WC:
> + addr = ioremap_wc(offset, size);
> + break;
> + }
>
> - addr = ioremap_wc(offset, size);
> if (addr) {
> *ptr = addr;
> devres_add(dev, ptr);
> @@ -98,7 +52,7 @@ void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
>
> return addr;
> }
> -EXPORT_SYMBOL(devm_ioremap_wc);
> +EXPORT_SYMBOL(__devm_ioremap);
>
> /**
> * devm_iounmap - Managed iounmap()
>
Christophe
---
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