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Date: Mon, 15 Jan 2018 09:06:17 +0800
From: Yisheng Xie <xieyisheng1@...wei.com>
To: christophe leroy <christophe.leroy@....fr>,
<gregkh@...uxfoundation.org>
CC: <linux-kernel@...r.kernel.org>, <thomas.lendacky@....com>
Subject: Re: [PATCH v4] devres: combine function devm_ioremap*
Hi Christophe,
Thanks for your review and comment, I will follow your suggestion listed in line.
Thanks
Yisheng
On 2018/1/14 0:39, christophe leroy wrote:
> 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
>
> ---
> L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel antivirus Avast.
> https://www.avast.com/antivirus
>
>
> .
>
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