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Re: [PATCH 1/2] staging: octeon-ethernet: don't assume that CPU 0 is spe

To: Aaro Koskinen <aaro.koskinen@iki.fi>
Subject: Re: [PATCH 1/2] staging: octeon-ethernet: don't assume that CPU 0 is special
From: Richard Weinberger <richard@nod.at>
Date: Sat, 28 Sep 2013 22:40:47 +0200
Cc: devel@driverdev.osuosl.org, linux-mips@linux-mips.org, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, David Daney <david.daney@cavium.com>
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Am 28.09.2013 21:50, schrieb Aaro Koskinen:
> Currently the driver assumes that CPU 0 is handling all the hard IRQs.
> This is wrong in Linux SMP systems where user is allowed to assign to
> hardware IRQs to any CPU. The driver will stop working if user sets
> smp_affinity so that interrupts end up being handled by other than CPU
> 0. The patch fixes that.
> 
> Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
> ---
>  drivers/staging/octeon/ethernet-rx.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/octeon/ethernet-rx.c 
> b/drivers/staging/octeon/ethernet-rx.c
> index e14a1bb..de831c1 100644
> --- a/drivers/staging/octeon/ethernet-rx.c
> +++ b/drivers/staging/octeon/ethernet-rx.c
> @@ -80,6 +80,8 @@ struct cvm_oct_core_state {
>  
>  static struct cvm_oct_core_state core_state __cacheline_aligned_in_smp;
>  
> +static int cvm_irq_cpu = -1;

Why are you introducing a new global variable here?
Can't you pass cvm_irq_cpu as argument to cvm_oct_enable_napi()?

Thanks,
//richard

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