linux-kernel - Re: [PATCH] MIPS: Fix compile error implicit declaration of function cpu_local

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Message-ID: <4B994E0C.1010503@caviumnetworks.com>
Date:	Thu, 11 Mar 2010 12:09:48 -0800
From:	David Daney <ddaney@...iumnetworks.com>
To:	pjohn@...sta.com, Ralf Baechle <ralf@...ux-mips.org>
CC:	linux-kernel@...r.kernel.org,
	Christoph Lameter <cl@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH] MIPS: Fix compile error implicit declaration of function
 cpu_local_wrap

On 03/11/2010 12:03 PM, Philby John wrote:
> The commit 38b7827fc removed cpu_local_xx macros that lead to
> a compile error: implicit declaration of function 'cpu_local_wrap',
> when compiled for the MIPS Cavium Octeon processors. Revert back
> to old code.
>
> CC: Christoph Lameter<cl@...ux-foundation.org>
> CC: Tejun Heo<tj@...nel.org>
> CC: David Daney<ddaney@...iumnetworks.com>
> Signed-off-by: Philby John<pjohn@...sta.com>

Ralf is testing a different patch for this problem.

David Daney


> ---
>   arch/mips/include/asm/local.h |   25 +++++++++++++++++++++++++
>   1 files changed, 25 insertions(+), 0 deletions(-)
>
> diff --git a/arch/mips/include/asm/local.h b/arch/mips/include/asm/local.h
> index bdcdef0..65ec69d 100644
> --- a/arch/mips/include/asm/local.h
> +++ b/arch/mips/include/asm/local.h
> @@ -193,4 +193,29 @@ static __inline__ long local_sub_return(long i, local_t * l)
>   #define __local_add(i, l)	((l)->a.counter+=(i))
>   #define __local_sub(i, l)	((l)->a.counter-=(i))
>
> +/* Need to disable preemption for the cpu local counters otherwise we could
> +   still access a variable of a previous CPU in a non atomic way. */
> +#define cpu_local_wrap_v(l)             \
> +	({ local_t res__;               \
> +	   preempt_disable();           \
> +	   res__ = (l);                 \
> +	   preempt_enable();            \
> +	   res__; })
> +#define cpu_local_wrap(l)               \
> +	({ preempt_disable();           \
> +	   l;                           \
> +	   preempt_enable(); })         \
> +
> +#define cpu_local_read(l)    cpu_local_wrap_v(local_read(&__get_cpu_var(l)))
> +#define cpu_local_set(l, i)  cpu_local_wrap(local_set(&__get_cpu_var(l), (i)))
> +#define cpu_local_inc(l)     cpu_local_wrap(local_inc(&__get_cpu_var(l)))
> +#define cpu_local_dec(l)     cpu_local_wrap(local_dec(&__get_cpu_var(l)))
> +#define cpu_local_add(i, l)  cpu_local_wrap(local_add((i),&__get_cpu_var(l)))
> +#define cpu_local_sub(i, l)  cpu_local_wrap(local_sub((i),&__get_cpu_var(l)))
> +
> +#define __cpu_local_inc(l)      cpu_local_inc(l)
> +#define __cpu_local_dec(l)      cpu_local_dec(l)
> +#define __cpu_local_add(i, l)   cpu_local_add((i), (l))
> +#define __cpu_local_sub(i, l)   cpu_local_sub((i), (l))
> +
>   #endif /* _ARCH_MIPS_LOCAL_H */

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