linux-kernel - Re: [PATCH v5] devres: combine function devm

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Message-ID: <20180123105649.GA17703@kroah.com>
Date:   Tue, 23 Jan 2018 11:56:49 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Yisheng Xie <xieyisheng1@...wei.com>
Cc:     christophe.leroy@....fr, thomas.lendacky@....com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5] devres: combine function devm_ioremap*

On Tue, Jan 23, 2018 at 06:50:49PM +0800, Yisheng Xie wrote:
> 
> 
> On 2018/1/23 16:42, Greg KH wrote:
> > On Tue, Jan 16, 2018 at 08:03:41PM +0800, Yisheng Xie wrote:
> >> 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 version, 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*
> >> v5:
> >>  - fix code style.
> >>
> >>  include/linux/io.h | 61 +++++++++++++++++++++++++++++++++++----
> >>  lib/devres.c       | 84 ++++++++++--------------------------------------------
> >>  2 files changed, 70 insertions(+), 75 deletions(-)
> >>
> >> diff --git a/include/linux/io.h b/include/linux/io.h
> >> index 32e30e8..4d0a640 100644
> >> --- a/include/linux/io.h
> >> +++ b/include/linux/io.h
> >> @@ -73,12 +73,61 @@ 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);
> >> +enum devm_ioremap_type {
> >> +	DEVM_IOREMAP = 0,
> >> +	DEVM_IOREMAP_NC,
> >> +	DEVM_IOREMAP_WC,
> >> +};
> > 
> > Why do these types need to be in a public .h file?
> > 
> > Why not just keep the .h file as-is and then just put the cleanup in the
> > .c file like you did?
> > 
> Right. I was just trying to inline these functions.

Doesn't really matter much, so no real need to.

> Anyway, I will follow your suggestion. Sorry for sending so many
> versions.

Not a problem at all, keep up the great work :)

greg k-h