linux-kernel - Re: [PATCH v2] arm64: add guard macros of unistd.h to prevent double inclusion

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Message-ID: <20140911150212.GP6158@arm.com>
Date:	Thu, 11 Sep 2014 16:02:12 +0100
From:	Will Deacon <will.deacon@....com>
To:	Yang Yingliang <yangyingliang@...wei.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Catalin Marinas <Catalin.Marinas@....com>
Subject: Re: [PATCH v2] arm64: add guard macros of unistd.h to prevent double
 inclusion

On Thu, Sep 11, 2014 at 10:21:18AM +0100, Yang Yingliang wrote:
> From: Yang Yingliang <yangyingliang@...wei.com>
> 
> Add guard macros for uapi/asm/unistd.h, asm/unistd.h and
> asm/unistd32.h.

Hmm, so I applied this and now my machine panics when we hit userspace. I
think the issue is that we no longer generate our syscall table in
arch/arm64/kernel/sys.c, because unistd.h is already included via
linux/syscalls.h but without the __SYSCALL definition.

So, a couple of questions:

  (1) Is the lack of header guards actually causing you a problem?
  (2) How did you test this?

I've dropped the patch.

Will
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