linux-kernel - Re: [PATCH 00/28] nios2 Linux kernel port

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Message-ID: <CAFiDJ5_dUpVTSeC36AfNKVN7BOa9GQ5vwSEWricm=8Sam9mR2A@mail.gmail.com>
Date:	Tue, 22 Apr 2014 19:20:45 +0800
From:	Ley Foon Tan <lftan@...era.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	cltang@...esourcery.com
Subject: Re: [PATCH 00/28] nios2 Linux kernel port

On Tue, Apr 22, 2014 at 6:56 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Tuesday 22 April 2014 18:37:11 Ley Foon Tan wrote:
>> Hi Arnd and Peter Anvin,
>>
>> Other than 64-bit time_t, clock_t and suseconds_t, can you confirm
>> that we don't need to have 64 bit off_t? See detail in link below.
>> I can submit the patches for 64-bit time changes
>> (include/asm-generic/posix_types.h and other archs) if everyone is
>> agreed on this.
>
> Yes.
Okay, will doing that.

>
>> Excerpt from https://lkml.org/lkml/2012/11/14/358 :
>> "Obviously, we want to use 64-bit off_t, but this is achieved already
>> through loff_t, which is used in all places in the asm-generic
>> ABI anyway (the syscalls using off_t are stripped out). I don't
>> think we want to have the other ones set to 64 bit on ARC or Meta,
>> although I'm not 100% sure about ino_t and nlink_t. "
>
> This is all still true. You should have no syscall using 'off_t',
> only loff_t.
>
> I still don't know whether we would want 32 or 64 bit ino_t and nlink_t
> for new architectures. It seems it would gain very little, but have
> a noticeable overhead.
Anyone have comment on this?
Chung-Lin (in CC list) is our nios2 toolchain maintainer. Do you have
any comment for 32 or 64 bit ino_t and nlink_t?
We will update the toolchain to support 64-bit time_t, so we hope that
any other toolchain change can happen in one time.

Thanks

Regards
Ley Foon
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