linux-kernel - Re: Build broken on s390 and ia64 [was: Linux 2.6.32.58]

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Date:	Mon, 5 Mar 2012 13:02:41 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	Greg KH <gregkh@...uxfoundation.org>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org, stable@...r.kernel.org, lwn@....net,
	Tony Luck <tony.luck@...el.com>,
	Jiri Slaby <jirislaby@...il.com>
Subject: Re: Build broken on s390 and ia64 [was: Linux 2.6.32.58]

On Mon, Mar 05, 2012 at 12:32:58PM +0100, Jiri Slaby wrote:
> On 03/04/2012 07:09 PM, Greg KH wrote:
> > I'm announcing the release of the 2.6.32.58 kernel.
> ...
> > Heiko Carstens (1): compat: fix compile breakage on s390
> 
> It's not that minimal it suggests. It removed asm/compat.h inclusion
> from arch/s390/kernel/setup.c. This causes build failures on
> !CONFIG_COMPAT:
> arch/s390/kernel/setup.c: In function 'setup_addressing_mode':
> arch/s390/kernel/setup.c:382: error: 'PSW32_ASC_SECONDARY' undeclared
> (first use in this function)
> arch/s390/kernel/setup.c:382: error: (Each undeclared identifier is
> reported only once
> arch/s390/kernel/setup.c:382: error: for each function it appears in.)
> arch/s390/kernel/setup.c:389: error: 'PSW32_ASC_PRIMARY' undeclared
> (first use in this function)

Ah, right. For kernels < 3.0 it is indeed necessary to include
asm/compat.h in arch/s390/kernel/setup.c.

The need for that got eliminated with
043d07084b5347a26eab0a07aa13a4a929ad9e71 "[S390] Remove data execution
protection".

> Perhaps asm/compat.h should be included from linux/compat.h
> unconditionally...

If you do that you need to add #ifdef wrappers around the is_compat_task()
definitions in each arch that supports CONFIG_COMPAT. If that's all that's
needed that would be great!

> > Linus Torvalds (2): Fix autofs compile without CONFIG_COMPAT
> 
> But who defines is_compat_task *with* CONFIG_COMPAT on ia64?
> 
> fs/autofs4/inode.c: In function 'autofs4_fill_super':
> fs/autofs4/inode.c:345: error: implicit declaration of function
> 'is_compat_task'

The ia64 compat code got entirely removed, since it was broken:

32974ad4907cdde6c9de612cd1b2ee0568fb9409 "[IA64] Remove COMPAT_IA32 support"

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