linux-kernel - Re: [PATCH v3 3/6] powerpc: move spinlock implementation to simple

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Date:   Thu, 09 Jul 2020 20:15:51 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Nicholas Piggin <npiggin@...il.com>, linuxppc-dev@...ts.ozlabs.org
Cc:     Nicholas Piggin <npiggin@...il.com>, Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Ingo Molnar <mingo@...hat.com>,
        Waiman Long <longman@...hat.com>,
        Anton Blanchard <anton@...abs.org>,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, kvm-ppc@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: Re: [PATCH v3 3/6] powerpc: move spinlock implementation to simple_spinlock

Nicholas Piggin <npiggin@...il.com> writes:
> To prepare for queued spinlocks. This is a simple rename except to update
> preprocessor guard name and a file reference.
>
> Signed-off-by: Nicholas Piggin <npiggin@...il.com>
> ---
>  arch/powerpc/include/asm/simple_spinlock.h    | 292 ++++++++++++++++++
>  .../include/asm/simple_spinlock_types.h       |  21 ++
>  arch/powerpc/include/asm/spinlock.h           | 285 +----------------
>  arch/powerpc/include/asm/spinlock_types.h     |  12 +-
>  4 files changed, 315 insertions(+), 295 deletions(-)
>  create mode 100644 arch/powerpc/include/asm/simple_spinlock.h
>  create mode 100644 arch/powerpc/include/asm/simple_spinlock_types.h
>
> diff --git a/arch/powerpc/include/asm/simple_spinlock.h b/arch/powerpc/include/asm/simple_spinlock.h
> new file mode 100644
> index 000000000000..e048c041c4a9
> --- /dev/null
> +++ b/arch/powerpc/include/asm/simple_spinlock.h
> @@ -0,0 +1,292 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +#ifndef __ASM_SIMPLE_SPINLOCK_H
> +#define __ASM_SIMPLE_SPINLOCK_H

_ASM_POWERPC_SIMPLE_SPINLOCK_H

> +#ifdef __KERNEL__

Shouldn't be necessary.

> +/*
> + * Simple spin lock operations.  
> + *
> + * Copyright (C) 2001-2004 Paul Mackerras <paulus@...ibm.com>, IBM
> + * Copyright (C) 2001 Anton Blanchard <anton@...ibm.com>, IBM
> + * Copyright (C) 2002 Dave Engebretsen <engebret@...ibm.com>, IBM
> + *	Rework to support virtual processors
> + *
> + * Type of int is used as a full 64b word is not necessary.
> + *
> + * (the type definitions are in asm/simple_spinlock_types.h)
> + */
> +#include <linux/irqflags.h>
> +#include <asm/paravirt.h>
> +#ifdef CONFIG_PPC64
> +#include <asm/paca.h>
> +#endif

I don't think paca.h needs a CONFIG_PPC64 guard, it contains one. I know
you're just moving the code, but still nice to cleanup slightly along
the way.

cheers