linux-kernel - Re: [PATCH 1/4] x86: cleanup early per cpu variables/accesses v3-folded

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Date:	Tue, 22 Apr 2008 09:24:09 -0700
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Jack Steiner <steiner@....com>
Subject: Re: [PATCH 1/4] x86: cleanup early per cpu variables/accesses	v3-folded

Ingo Molnar wrote:
> * Mike Travis <travis@....com> wrote:
> 
>>   * Introduce a new PER_CPU macro called "EARLY_PER_CPU".  This is
>>     used by some per_cpu variables that are initialized and accessed
>>     before there are per_cpu areas allocated.
> 
> build fails with:
> 
> arch/x86/kernel/built-in.o: In function `flat_apic_id_registered':
> genapic_flat_64.c:(.text+0x13e1d): undefined reference to `phys_cpu_present_map'
> genapic_flat_64.c:(.text+0x13e24): undefined reference to `phys_cpu_present_map'
> arch/x86/kernel/built-in.o: In function `APIC_init_uniprocessor':
> : undefined reference to `phys_cpu_present_map'
> [...]
> 
> with this config:
> 
>   http://redhat.com/~mingo/misc/config-Tue_Apr_22_15_40_10_CEST_2008.bad
> 
> 	Ingo

Hi Ingo,

Which tree are you using?  I don't get that error at all.  I'm on sched-latest:

#> cat .git/config
[core]
        repositoryformatversion = 0
        filemode = true
        bare = false
        logallrefupdates = true
[remote "linus"]
        url = git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
        fetch = +refs/heads/*:refs/remotes/linus/*
[remote "sched-devel"]
        url = git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched-devel.git
        fetch = +refs/heads/*:refs/remotes/sched-devel/*
[branch "sched-latest"]
        remote = sched-devel
        merge = refs/heads/latest


Here's the change I made to arch/x86/kernel/setup.c.

From:

    physid_mask_t phys_cpu_present_map;

    DEFINE_PER_CPU(u16, x86_cpu_to_apicid) = BAD_APICID;
    EXPORT_PER_CPU_SYMBOL(x86_cpu_to_apicid);

    /* Bitmask of physically existing CPUs */
    physid_mask_t phys_cpu_present_map;

To:

    /* Bitmask of physically existing CPUs */
    physid_mask_t phys_cpu_present_map;


(Actually, I don't understand why it didn't generate a multiple
define error before?)

Here's the symbol in Bss space:

#> nm -Bo arch/x86/kernel/built-in.o | grep phys_cpu_present_map
arch/x86/kernel/built-in.o:00000000000009a0 B phys_cpu_present_map

#> grep phys_cpu_present_map System.map
ffffffff809792c0 B phys_cpu_present_map


Building using your config file I do get this error (with or without
my patches):

  CC [M]  net/netfilter/nf_conntrack_sip.o
.../linux-2.6.sched/net/netfilter/nf_conntrack_sip.c: In function 'set_expected_rtp_rtcp':
.../linux-2.6.sched/net/netfilter/nf_conntrack_sip.c:786: error: 'struct nf_conntrack_expect' has no member named 'saved_ip'
.../linux-2.6.sched/net/netfilter/nf_conntrack_sip.c:787: error: 'struct nf_conntrack_expect' has no member named 'saved_proto'
.../linux-2.6.sched/net/netfilter/nf_conntrack_sip.c:789: error: 'struct nf_conntrack_expect' has no member named 'saved_ip'
.../linux-2.6.sched/net/netfilter/nf_conntrack_sip.c:790: error: 'struct nf_conntrack_expect' has no member named 'saved_ip'
.../linux-2.6.sched/net/netfilter/nf_conntrack_sip.c:791: error: 'struct nf_conntrack_expect' has no member named 'saved_proto'

Turning off CONFIG_NF_CONNTRACK_SIP gets around the error and it builds ok.

Should I try x86/latest or the merge of sched/latest + x86/latest?

Or...?

Thanks,
Mike

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