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Re: [patch V4] lib: GCD: Use binary GCD algorithm instead of Euclidean

From Sam Ravnborg <sam@ravnborg.org>
Newsgroups linux.kernel
Subject Re: [patch V4] lib: GCD: Use binary GCD algorithm instead of Euclidean
Date 2016-05-07 13:30 +0200
Message-ID <rw8AN-Fn-1@gated-at.bofh.it> (permalink)
References <rvKI9-2Dh-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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> diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
> index 57ffaf2..ca675ed 100644
> --- a/arch/sparc/Kconfig
> +++ b/arch/sparc/Kconfig
> @@ -42,6 +42,7 @@ config SPARC
>  	select ODD_RT_SIGACTION
>  	select OLD_SIGSUSPEND
>  	select ARCH_HAS_SG_CHAIN
> +	select CPU_NO_EFFICIENT_FFS
>  
>  config SPARC32
>  	def_bool !64BIT

sparc64 have an efficient ffs implementation.
We use run-time patching to use the proper version
depending on the actual sparc cpu.

As this is determinded at config time, then let the
sparc cpu that has the efficient ffs benefit from this.

In other words - select CPU_NO_EFFICIENT_FFS only for SPARC32.

	Sam

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[patch V4] lib: GCD: Use binary GCD algorithm instead of Euclidean zengzhaoxiu@163.com - 2016-05-06 12:00 +0200
  Re: [patch V4] lib: GCD: Use binary GCD algorithm instead of  Euclidean Andrew Morton <akpm@linux-foundation.org> - 2016-05-07 01:10 +0200
  Re: [patch V4] lib: GCD: Use binary GCD algorithm instead of Euclidean "George Spelvin" <linux@horizon.com> - 2016-05-07 10:50 +0200
    Re: [patch V4] lib: GCD: Use binary GCD algorithm instead of Euclidean Andreas Schwab <schwab@linux-m68k.org> - 2016-05-07 12:50 +0200
      Re: [patch V4] lib: GCD: Use binary GCD algorithm instead of Euclidean "George Spelvin" <linux@horizon.com> - 2016-05-07 22:50 +0200
    Re: [patch V4] lib: GCD: Use binary GCD algorithm instead of  Euclidean Zhaoxiu Zeng <zengzhaoxiu@163.com> - 2016-05-08 15:20 +0200
  Re: [patch V4] lib: GCD: Use binary GCD algorithm instead of  Euclidean Sam Ravnborg <sam@ravnborg.org> - 2016-05-07 13:30 +0200
    Re: [patch V4] lib: GCD: Use binary GCD algorithm instead of Euclidean "George Spelvin" <linux@horizon.com> - 2016-05-08 00:40 +0200

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