linux-kernel - Re: [PATCH 1/1] Kernel compile bug in 2.6.22.6/7 {maybe more} ARM/StrongARM

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Message-ID: <20070925073132.GA29127@flint.arm.linux.org.uk>
Date:	Tue, 25 Sep 2007 08:31:32 +0100
From:	Russell King <rmk+lkml@....linux.org.uk>
To:	Greg.Chandler@...lsfargo.com, cpufreq@...ts.linux.org.uk,
	davej@...hat.com
Cc:	linux-kernel@...r.kernel.org, dan.j.williams@...el.com
Subject: Re: [PATCH 1/1] Kernel compile bug in 2.6.22.6/7 {maybe more} ARM/StrongARM

On Mon, Sep 24, 2007 at 05:53:57PM -0500, Greg.Chandler@...lsfargo.com wrote:
> I was building a kernel for an iPaq {SA1110} and ran into this.
> 
> linux-2.6.22.7/arch/arm/mach-sa1100/generic.c:
> Has a: #include <linux/cpufreq.h>
> Then afterwards there is a: #if defined(CONFIG_CPU_FREQ_SA1100) ||
> defined(CONFIG_CPU_FREQ_SA1110)
> who's else section redefines the cpufreq_get function inhereited from
> the header....
> 
> I'm guessing no one ever ended up in the "else" section until now, and
> that the header was added some time ago and no one caught this.
> This patch worked for me to get rid of the compile time problems.  I'm
> having issues with the kernel, but as far as I can tell they are form
> the Frame buffer and not because of this.  If this assessment is correct
> {the not needing this code anymore} then please pass this along so it
> makes it into an upcoming release.
> 
> --- linux-2.6.22.7/arch/arm/mach-sa1100/generic.c.orig  2007-09-24
> 17:36:21.000000000 -0500
> +++ linux-2.6.22.7/arch/arm/mach-sa1100/generic.c       2007-09-24
> 17:40:02.000000000 -0500
> @@ -107,15 +107,6 @@ unsigned int sa11x0_getspeed(unsigned in
>         return cclk_frequency_100khz[PPCR & 0xf] * 100;
>  }
> 
> -#else
> -/*
> - * We still need to provide this so building without cpufreq works.
> - */
> -unsigned int cpufreq_get(unsigned int cpu)
> -{
> -       return cclk_frequency_100khz[PPCR & 0xf] * 100;
> -}
> -EXPORT_SYMBOL(cpufreq_get);
>  #endif
> 
>  /*

No.  That code is required - the StrongARM 1100 framebuffer driver
*needs* to know what the CPU frequency is so it can set the pixel
clock divisor.

The real problem is the silly people who added this to cpufreq.h:

#ifdef CONFIG_CPU_FREQ
unsigned int cpufreq_quick_get(unsigned int cpu);
unsigned int cpufreq_get(unsigned int cpu);
#else
static inline unsigned int cpufreq_quick_get(unsigned int cpu)
{
        return 0;
}
static inline unsigned int cpufreq_get(unsigned int cpu)
{
        return 0;
}
#endif

which utterly bogus.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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