linux-kernel - Re: [PATCH] locking/arch: Move qrwlock.h include after qspinlock.h

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Date:   Wed, 10 Feb 2021 19:28:56 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Waiman Long <longman@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mips@...r.kernel.org, linux-xtensa@...ux-xtensa.org,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Ben Gardon <bgardon@...gle.com>
Subject: Re: [PATCH] locking/arch: Move qrwlock.h include after qspinlock.h

On 10/02/21 15:45, Waiman Long wrote:
> The queued rwlock code has a dependency on the current spinlock
> implementation (likely to be qspinlock), but not vice versa. Including
> qrwlock.h before qspinlock.h can be problematic when expanding qrwlock
> functionality.
> 
> If both qspinlock.h and qrwlock.h are to be included, the qrwlock.h
> include should always be after qspinlock.h. Update the current set of
> asm/spinlock.h files to enforce that.
> 
> Signed-off-by: Waiman Long <longman@...hat.com>

arch/sparc/include/asm/spinlock_64.h is missing.  Also, the include in 
kernel/locking/qrwlock.c is not necessary (it may be there for aesthetic 
reasons, but it complicates thing in this case).

I'll send a v2 that is based on the kvm/next tree.

Paolo

> ---
>   arch/arm64/include/asm/spinlock.h  | 2 +-
>   arch/mips/include/asm/spinlock.h   | 2 +-
>   arch/xtensa/include/asm/spinlock.h | 2 +-
>   3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/spinlock.h b/arch/arm64/include/asm/spinlock.h
> index 9083d6992603..0525c0b089ed 100644
> --- a/arch/arm64/include/asm/spinlock.h
> +++ b/arch/arm64/include/asm/spinlock.h
> @@ -5,8 +5,8 @@
>   #ifndef __ASM_SPINLOCK_H
>   #define __ASM_SPINLOCK_H
>   
> -#include <asm/qrwlock.h>
>   #include <asm/qspinlock.h>
> +#include <asm/qrwlock.h>
>   
>   /* See include/linux/spinlock.h */
>   #define smp_mb__after_spinlock()	smp_mb()
> diff --git a/arch/mips/include/asm/spinlock.h b/arch/mips/include/asm/spinlock.h
> index 8a88eb265516..6ce2117e49f6 100644
> --- a/arch/mips/include/asm/spinlock.h
> +++ b/arch/mips/include/asm/spinlock.h
> @@ -10,7 +10,6 @@
>   #define _ASM_SPINLOCK_H
>   
>   #include <asm/processor.h>
> -#include <asm/qrwlock.h>
>   
>   #include <asm-generic/qspinlock_types.h>
>   
> @@ -27,5 +26,6 @@ static inline void queued_spin_unlock(struct qspinlock *lock)
>   }
>   
>   #include <asm/qspinlock.h>
> +#include <asm/qrwlock.h>
>   
>   #endif /* _ASM_SPINLOCK_H */
> diff --git a/arch/xtensa/include/asm/spinlock.h b/arch/xtensa/include/asm/spinlock.h
> index 584b0de6f2ca..41c449ece2d8 100644
> --- a/arch/xtensa/include/asm/spinlock.h
> +++ b/arch/xtensa/include/asm/spinlock.h
> @@ -12,8 +12,8 @@
>   #define _XTENSA_SPINLOCK_H
>   
>   #include <asm/barrier.h>
> -#include <asm/qrwlock.h>
>   #include <asm/qspinlock.h>
> +#include <asm/qrwlock.h>
>   
>   #define smp_mb__after_spinlock()	smp_mb()
>   
>