linux-kernel - Re: [PATCH 4/6] arch/sparc: Enable queued rwlocks for SPARC

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Date:   Thu, 18 May 2017 22:31:13 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     babu.moger@...cle.com
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 4/6] arch/sparc: Enable queued rwlocks for SPARC

From: Babu Moger <babu.moger@...cle.com>
Date: Thu, 18 May 2017 18:36:08 -0600

> @@ -82,6 +82,7 @@ config SPARC64
>  	select HAVE_ARCH_AUDITSYSCALL
>  	select ARCH_SUPPORTS_ATOMIC_RMW
>  	select HAVE_NMI
> +	select ARCH_USE_QUEUED_RWLOCKS
>  

If you are selecting this on SPARC64 all the time, then:

> @@ -94,6 +94,7 @@ static inline void arch_spin_lock_flags(arch_spinlock_t *lock, unsigned long fla
>  	: "memory");
>  }
>  
> +#ifndef CONFIG_QUEUED_RWLOCKS
>  /* Multi-reader locks, these are much saner than the 32-bit Sparc ones... */

You can remove this segment of ifdef'd code altogether since it is in
a sparc64 specific header file.