linux-kernel - Re: percpu: Fixup __this_cpu

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Message-ID: <alpine.DEB.2.00.1107061257330.17624@router.home>
Date:	Wed, 6 Jul 2011 12:58:08 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Tejun Heo <tj@...nel.org>
cc:	linux-kernel@...r.kernel.org
Subject: Re: percpu: Fixup __this_cpu_xchg* operations

Could you pick up this patch? Have not gotten a reply so far.

On Fri, 20 May 2011, Christoph Lameter wrote:

> Subject: percpu: Fixup __this_cpu_xchg* operations
>
> Somehow we got into a situation where the __this_cpu_xchg() operations were
> not defined in the same way as this_cpu_xchg() and friends. I had some build
> failures under 32 bit that were addressed by these fixes.
>
> Signed-off-by: Christoph Lameter <cl@...ux.com>
>
>
> ---
>  arch/x86/include/asm/percpu.h |   12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> Index: linux-2.6/arch/x86/include/asm/percpu.h
> ===================================================================
> --- linux-2.6.orig/arch/x86/include/asm/percpu.h	2011-03-30 14:09:28.000000000 -0500
> +++ linux-2.6/arch/x86/include/asm/percpu.h	2011-03-30 14:10:16.000000000 -0500
> @@ -388,12 +388,9 @@ do {									\
>  #define __this_cpu_xor_1(pcp, val)	percpu_to_op("xor", (pcp), val)
>  #define __this_cpu_xor_2(pcp, val)	percpu_to_op("xor", (pcp), val)
>  #define __this_cpu_xor_4(pcp, val)	percpu_to_op("xor", (pcp), val)
> -/*
> - * Generic fallback operations for __this_cpu_xchg_[1-4] are okay and much
> - * faster than an xchg with forced lock semantics.
> - */
> -#define __this_cpu_xchg_8(pcp, nval)	percpu_xchg_op(pcp, nval)
> -#define __this_cpu_cmpxchg_8(pcp, oval, nval)	percpu_cmpxchg_op(pcp, oval, nval)
> +#define __this_cpu_xchg_1(pcp, val)	percpu_xchg_op(pcp, val)
> +#define __this_cpu_xchg_2(pcp, val)	percpu_xchg_op(pcp, val)
> +#define __this_cpu_xchg_4(pcp, val)	percpu_xchg_op(pcp, val)
>
>  #define this_cpu_read_1(pcp)		percpu_from_op("mov", (pcp), "m"(pcp))
>  #define this_cpu_read_2(pcp)		percpu_from_op("mov", (pcp), "m"(pcp))
> @@ -471,6 +468,7 @@ do {									\
>  #define __this_cpu_cmpxchg_double_4(pcp1, pcp2, o1, o2, n1, n2)		percpu_cmpxchg8b_double(pcp1, o1, o2, n1, n2)
>  #define this_cpu_cmpxchg_double_4(pcp1, pcp2, o1, o2, n1, n2)		percpu_cmpxchg8b_double(pcp1, o1, o2, n1, n2)
>  #define irqsafe_cpu_cmpxchg_double_4(pcp1, pcp2, o1, o2, n1, n2)	percpu_cmpxchg8b_double(pcp1, o1, o2, n1, n2)
> +
>  #endif /* CONFIG_X86_CMPXCHG64 */
>
>  /*
> @@ -485,6 +483,8 @@ do {									\
>  #define __this_cpu_or_8(pcp, val)	percpu_to_op("or", (pcp), val)
>  #define __this_cpu_xor_8(pcp, val)	percpu_to_op("xor", (pcp), val)
>  #define __this_cpu_add_return_8(pcp, val) percpu_add_return_op(pcp, val)
> +#define __this_cpu_xchg_8(pcp, nval)	percpu_xchg_op(pcp, nval)
> +#define __this_cpu_cmpxchg_8(pcp, oval, nval)	percpu_cmpxchg_op(pcp, oval, nval)
>
>  #define this_cpu_read_8(pcp)		percpu_from_op("mov", (pcp), "m"(pcp))
>  #define this_cpu_write_8(pcp, val)	percpu_to_op("mov", (pcp), val)
>
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