linux-kernel - Re: [PATCH] Unifying headers for AArch64 and ARM

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Date:   Mon, 4 Sep 2017 15:23:50 +0300
From:   Yury Norov <ynorov@...iumnetworks.com>
To:     Kaushik Phatak <Kaushik.Phatak@...t.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Russell King <linux@...linux.org.uk>,
        Dave Martin <Dave.Martin@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] Unifying headers for AArch64 and ARM

Hi Kaushik,

(CC arm and arch maintainers)

On Fri, Sep 01, 2017 at 12:24:08PM +0000, Kaushik Phatak wrote:
> Ping for this patch:
> https://lkml.org/lkml/2017/8/10/136
> 
> The patch can be viewed on the mail-archive link below,
> https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1465874.html
> 
> Please let me know if anyone has any feedback on this.
> Thanks.
> 
> Best Regards,
> Kaushik M. Phatak
> 
> -----Original Message-----
> From: Kaushik Phatak
> Sent: Thursday, August 10, 2017 2:12 PM
> To: 'linux-kernel@...r.kernel.org' <linux-kernel@...r.kernel.org>
> Subject: [PATCH] Unifying headers for AArch64 and ARM
> 
> Hi,
> This patch is an attempt to unify the kernel header files for AArch64 and ARM.
> We have developed similar patch for glibc, which unifies the headers in sysdeps.
> We plan to post that separately to libc-alpha.
> 
> This developed patch is similar to something that X86 does with the macros
> (__x86_64__) and (__ILP32__).

scripts/checkpatch.pl reports 30 errors and 24 warnings on your patch.
Also, you didn't CC maintainers, so they most probably missed your
patch in LKML noise.  I CCed some of them here.
scripts/get_maintainers.pl should point you to proper persons.

> We have noticed some activity in this area in recent times, Linux patches by Yury Norov:
> [07/20] arm64:uapi: set __BITS_PER_LONG correctly for ILP32 and LP64
> https://patchwork.kernel.org/patch/9599053/

arm64/ilp32 and arm64/lp64 is the single platform, and so lp64 and
ilp32 parts share the same installed kernel headers. That's why I had to
introduce #ifdef magic here and in other kernel and glibc headers. 

Arm32 is different platform, so I don't understand what the benefit
in joining headers. Could you explain it in details.

Your patch has 2880 lines. It's quite difficult to read it at once
(and I didn't do that). Is it possible split in into the series?

Yury