linux-kernel - Re: [PATCH 1/6] kernel/locking: Fix compile error with qrwlock.c

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Date:   Fri, 19 May 2017 11:35:09 -0500
From:   Babu Moger <babu.moger@...cle.com>
To:     David Miller <davem@...emloft.net>
Cc:     peterz@...radead.org, mingo@...hat.com, arnd@...db.de,
        shannon.nelson@...cle.com, haakon.bugge@...cle.com,
        steven.sistare@...cle.com, vijay.ac.kumar@...cle.com,
        jane.chu@...cle.com, sparclinux@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 1/6] kernel/locking: Fix compile error with qrwlock.c


On 5/18/2017 9:27 PM, David Miller wrote:
> From: Babu Moger <babu.moger@...cle.com>
> Date: Thu, 18 May 2017 18:36:05 -0600
>
>> Seeing this error on SPARC while compiling qrwlock.c.
>>
>>    CC      kernel/locking/qrwlock.o
>> In file included from ./include/asm-generic/qrwlock_types.h:5,
>>                   from ./arch/sparc/include/asm/qrwlock.h:4,
>>                   from kernel/locking/qrwlock.c:24:
>> ./arch/sparc/include/asm/spinlock_types.h:5:3: error:
>>          #error "please don't include this file directly"
>>
>> Re-arrange the includes in qrwlock_types.h and also include spinlock.h
>> in qrwlock.c to fix it. This should also help other architectures when
>> queued rwlock is enabled.
>>
>> Signed-off-by: Babu Moger <babu.moger@...cle.com>
>> Reviewed-by: Håkon Bugge <haakon.bugge@...cle.com>
>> Reviewed-by: Jane Chu <jane.chu@...cle.com>
>> Reviewed-by: Shannon Nelson <shannon.nelson@...cle.com>
>> Reviewed-by: Vijay Kumar <vijay.ac.kumar@...cle.com>
> I think you can simply remove the:
>
> #ifndef __LINUX_SPINLOCK_TYPES_H
> # error "please don't include this file directly"
> #endif
>
> stanza from the sparc header file instead.  Other architectures
> don't use this guard.

Sure. I can remove this for SPARC.  Will make this as a separate patch.
But, there are still some architectures use this gaurd.

arch/xtensa/include/asm/spinlock_types.h:#ifndef __LINUX_SPINLOCK_TYPES_H
arch/arm/include/asm/spinlock_types.h:#ifndef __LINUX_SPINLOCK_TYPES_H
arch/powerpc/include/asm/spinlock_types.h:#ifndef __LINUX_SPINLOCK_TYPES_H
arch/metag/include/asm/spinlock_types.h:#ifndef __LINUX_SPINLOCK_TYPES_H
arch/hexagon/include/asm/spinlock_types.h:#ifndef __LINUX_SPINLOCK_TYPES_H
arch/alpha/include/asm/spinlock_types.h:#ifndef __LINUX_SPINLOCK_TYPES_H
arch/sh/include/asm/spinlock_types.h:#ifndef __LINUX_SPINLOCK_TYPES_H
arch/mn10300/include/asm/spinlock_types.h:#ifndef __LINUX_SPINLOCK_TYPES_H
arch/ia64/include/asm/spinlock_types.h:#ifndef __LINUX_SPINLOCK_TYPES_H
arch/blackfin/include/asm/spinlock_types.h:#ifndef __LINUX_SPINLOCK_TYPES_H
arch/m32r/include/asm/spinlock_types.h:#ifndef __LINUX_SPINLOCK_TYPES_H
arch/s390/include/asm/spinlock_types.h:#ifndef __LINUX_SPINLOCK_TYPES_H
arch/arm64/include/asm/spinlock_types.h:#if 
!defined(__LINUX_SPINLOCK_TYPES_H) && !defined(__ASM_SPINLOCK_H)
arch/tile/include/asm/spinlock_types.h:#ifndef __LINUX_SPINLOCK_TYPES_H
arch/mips/include/asm/spinlock_types.h:#ifndef __LINUX_SPINLOCK_TYPES_H

I think we need  still need this patch as it re-arrages headers 
properly. Will send  v2 series soon.