linux-kernel - Re: [PATCH v3 2/4] asm-generic: Provide a fncpy() implementation

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Date:   Mon, 19 Jun 2017 10:27:33 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Yury Norov <ynorov@...iumnetworks.com>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     "open list:GENERIC INCLUDE/ASM HEADER FILES" 
        <linux-arch@...r.kernel.org>, Keerthy J <j-keerthy@...com>,
        Arnd Bergmann <arnd@...db.de>, Dave Gerlach <d-gerlach@...com>,
        Tony Lindgren <tony@...mide.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Russell King <linux@...linux.org.uk>,
        open list <linux-kernel@...r.kernel.org>,
        bcm-kernel-feedback-list@...adcom.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        linux-omap@...r.kernel.org, Shawn Guo <shawnguo@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 2/4] asm-generic: Provide a fncpy() implementation

On 06/19/2017 08:18 AM, Yury Norov wrote:
> On Mon, Jun 19, 2017 at 02:51:08AM +0300, Yury Norov wrote:
>> Hi Florian,
>>
>> Some questions and thoughts inline.
>>
>> Yury
>>
>> On Fri, Jun 16, 2017 at 05:07:42PM -0700, Florian Fainelli wrote:
>>> Define a generic fncpy() implementation largely based on the ARM version
>>> that requires an 8 bytes alignment for the destination address where to
>>> copy this function as well as the function's own address.
>>>
>>> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
>>> ---
>>>  include/asm-generic/fncpy.h | 93 +++++++++++++++++++++++++++++++++++++++++++++
>>>  1 file changed, 93 insertions(+)
>>>  create mode 100644 include/asm-generic/fncpy.h
> 
> One else thing I forgot to ask - now you have the generic
> implementation for fncpy(), so do you really need to save arm
> version of it?

Yes, it needs to deal with the Thumb bit, and there is no point in
making the generic implementation extremely flexible to support that
special case.

Thanks
-- 
Florian