linux-kernel - Re: [PATCH] ARM: remove unused/deprecated read_cpuid_part

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Date:	Tue, 5 Aug 2014 12:29:56 -0400 (EDT)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
cc:	Russell King <rmk+kernel@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: remove unused/deprecated read_cpuid_part_number()

On Tue, 5 Aug 2014, Bartlomiej Zolnierkiewicz wrote:

> Commit af040ffc9ba1 ("ARM: make it easier to check the CPU part
> number correctly") has left (now unused in the upstream tree and
> marked as deprecated) read_cpuid_part_number() while changing
> the way it works (using the old function with the definitions will
> now always evaluate as false).  This causes problems with porting
> older code to new kernels as the code compiles (with warnings but
> they are very easy to miss) but it can fail silently or work just
> fine depending on the used hardware.
> 
> Remove unused/deprecated read_cpuid_part_number() so developers
> have to update their code during build time instead of running into
> tricky runtime problems later.
> 
> Please see the commit af040ffc9ba1 for details on how to convert
> your old out-of-tree code to use read_cpuid_part() instead of
> read_cpuid_part_number().
> 
> Cc: Nicolas Pitre <nico@...aro.org>
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>

If there are no more in-tree users then it should go indeed.

Acked-by: Nicolas Pitre <nico@...aro.org>

> ---
>  arch/arm/include/asm/cputype.h |    5 -----
>  1 file changed, 5 deletions(-)
> 
> Index: b/arch/arm/include/asm/cputype.h
> ===================================================================
> --- a/arch/arm/include/asm/cputype.h	2014-08-04 15:09:30.166988335 +0200
> +++ b/arch/arm/include/asm/cputype.h	2014-08-05 15:40:03.793317783 +0200
> @@ -182,11 +182,6 @@ static inline unsigned int __attribute_c
>  	return read_cpuid_id() & 0xff00fff0;
>  }
>  
> -static inline unsigned int __attribute_const__ __deprecated read_cpuid_part_number(void)
> -{
> -	return read_cpuid_id() & 0xFFF0;
> -}
> -
>  static inline unsigned int __attribute_const__ xscale_cpu_arch_version(void)
>  {
>  	return read_cpuid_id() & ARM_CPU_XSCALE_ARCH_MASK;
> 
> 
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