linux-kernel - Re: [PATCH 11/31] nds32: Atomic operations

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Date:   Wed, 8 Nov 2017 09:54:25 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Greentime Hu <green.hu@...il.com>
Cc:     greentime@...estech.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Networking <netdev@...r.kernel.org>,
        Vincent Chen <vincentc@...estech.com>,
        Palmer Dabbelt <palmer@...belt.com>
Subject: Re: [PATCH 11/31] nds32: Atomic operations

On Wed, Nov 8, 2017 at 6:54 AM, Greentime Hu <green.hu@...il.com> wrote:
> From: Greentime Hu <greentime@...estech.com>
>
> Signed-off-by: Vincent Chen <vincentc@...estech.com>
> Signed-off-by: Greentime Hu <greentime@...estech.com>
> ---
>  arch/nds32/include/asm/futex.h    |  116 ++++++++++++++++++++++++
>  arch/nds32/include/asm/spinlock.h |  178 +++++++++++++++++++++++++++++++++++++
>  2 files changed, 294 insertions(+)
>  create mode 100644 arch/nds32/include/asm/futex.h
>  create mode 100644 arch/nds32/include/asm/spinlock.h


> diff --git a/arch/nds32/include/asm/spinlock.h b/arch/nds32/include/asm/spinlock.h
> new file mode 100644
> index 0000000..dd5fc71
> --- /dev/null
> +++ b/arch/nds32/include/asm/spinlock.h
> @@ -0,0 +1,178 @@
> +
> +#define arch_spin_unlock_wait(lock) \
> +       do { while (arch_spin_is_locked(lock)) cpu_relax(); } while (0)

This was removed from the other architectures in commit
952111d7db02 ("arch: Remove spin_unlock_wait() arch-specific definitions")

Please remove this as well.

Palmer, I see riscv has the same thing, please also add a patch to your
tree to remove it.

> +#define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
> +
> +static inline void arch_spin_lock(arch_spinlock_t * lock)
> +{
> +       unsigned long tmp;
> +
> +       __asm__ __volatile__("1:\n"
> +                            "\tllw\t%0, [%1]\n"
> +                            "\tbnez\t%0, 1b\n"
> +                            "\tmovi\t%0, #0x1\n"
> +                            "\tscw\t%0, [%1]\n"
> +                            "\tbeqz\t%0, 1b\n"
> +                            :"=&r"(tmp)
> +                            :"r"(&lock->lock)
> +                            :"memory");

The coding style seems inconsistent here, the other inline asm uses real tabs
instead of \t, and 'asm volatile' is generally preferred over '__asm__
__volatile__'.

       Arnd