linux-kernel - Re: [PATCH v4 0/5] x86: Cleanup and simplify cpu-specific data

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Date:	Mon, 27 Feb 2012 20:52:55 -0400
From:	Kevin Winchester <kjwinchester@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Randy Dunlap <rdunlap@...otime.net>,
	Nick Bowler <nbowler@...iptictech.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/5] x86: Cleanup and simplify cpu-specific data

On 27 February 2012 07:59, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Kevin Winchester <kjwinchester@...il.com> wrote:
>
>> Various per-cpu fields are define in arch/x86/kernel/smpboot.c
>> that are basically equivalent to the cpu-specific data in
>> struct cpuinfo_x86. By moving these fields into the structure,
>> a number of codepaths can be simplified since they no longer
>> need to care about those fields not existing on !SMP builds.
>
> Works mostly fine, except with the attached 32-bit UP !APIC
> config I get various build failures (resolved via the patch
> below) and a link failure (not resolved):
>

I get the following failure before I get to link time:

In file included from
/home/kevin/linux/linux-2.6/arch/x86/include/asm/uaccess.h:573:0,
                 from
/home/kevin/linux/linux-2.6/arch/x86/include/asm/sections.h:5,
                 from
/home/kevin/linux/linux-2.6/arch/x86/include/asm/hw_irq.h:26,
                 from include/linux/irq.h:357,
                 from
/home/kevin/linux/linux-2.6/arch/x86/include/asm/hardirq.h:5,
                 from include/linux/hardirq.h:7,
                 from include/linux/interrupt.h:12,
                 from net/core/pktgen.c:135:
In function ‘copy_from_user’,
    inlined from ‘pktgen_if_write’ at net/core/pktgen.c:877:20:
/home/kevin/linux/linux-2.6/arch/x86/include/asm/uaccess_32.h:211:26:
error: call to ‘copy_from_user_overflow’ declared with attribute
error: copy_from_user() buffer size is not provably correct
make[2]: *** [net/core/pktgen.o] Error 1

On:

gcc (GCC) 4.6.2 20120120 (prerelease)

Is that my fault, or something else?

Kevin
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