linux-kernel - Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table (in entry.S) to use it

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Message-ID: <20160511075438.GA15628@yury-N73SV>
Date:	Wed, 11 May 2016 11:04:38 +0300
From:	Yury Norov <ynorov@...iumnetworks.com>
To:	"Zhangjian (Bamvor)" <bamvor.zhangjian@...wei.com>
CC:	Arnd Bergmann <arnd@...db.de>, <linux-doc@...r.kernel.org>,
	Andrew Pinski <Andrew.Pinski@...iumnetworks.com>,
	<catalin.marinas@....com>, <heiko.carstens@...ibm.com>,
	Hanjun Guo <guohanjun@...wei.com>, <joseph@...esourcery.com>,
	<linux-arch@...r.kernel.org>, <linux-s390@...r.kernel.org>,
	"jijun (D)" <jijun2@...wei.com>,
	<Prasun.Kapoor@...iumnetworks.com>, <schwab@...e.de>,
	<agraf@...e.de>, <pinskia@...il.com>, <klimov.linux@...il.com>,
	<broonie@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<Nathan_Lynch@...tor.com>, <linux-kernel@...r.kernel.org>,
	Andrew Pinski <apinski@...ium.com>, <schwidefsky@...ibm.com>,
	<christoph.muellner@...obroma-systems.com>
Subject: Re: [PATCH 20/25] arm64:ilp32: add sys_ilp32.c and a separate table
 (in entry.S) to use it

On Wed, May 11, 2016 at 10:04:16AM +0800, Zhangjian (Bamvor) wrote:
[...]

> >>Ok, I will test the ltp syscall test.
> >>With this changes, the issue I mentioned should be fixed. But we still
> >>use mmap2 syscall for ILP32 application when we pass the offset instead
> >>of page offset. Is it correct?
> >
> >I don't remember. It's probably not important whether we have the shift
> >in there, as long as it's independent of the actual kernel page size and
> >user space and kernel agree on the calling conventions.
> Well. I am ok with where to shift the pages size because we get the same
> result. I was just thinking if we should get rid of the name of mmap2 in our
> ILP32 porting. Actually, it is mmap but we name it as mmap2. User may confused
> if they do not know the implementations.
> 

This is what generic unistd.h does. If you want to change it, you'd
change each arch that uses generic unistd.h.

> Regards
> 
> Bamvor
> 
> >
> >	Arnd
> >
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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