linux-kernel - Re: [PATCH] xen: fix 32-bit build resulting from mmu move

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Date:	Tue, 03 Feb 2009 10:05:59 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] xen: fix 32-bit build resulting from mmu move

Ingo Molnar wrote:
> i have a lot of successful builds with that pattern, that's why i asked for 
> a specific config from you that definitely triggers it - i'd like to 
> investigate how it escaped my testing procedures.
>   

Hm, I don't see how you could be; the functions are just outright 
missing.  Without the patch, the attached config fails with:

$ make 'ARCH=i386' arch/x86/xen/mmu.o
[...]
  CC      arch/x86/xen/mmu.o
/home/jeremy/hg/xen/paravirt/linux/arch/x86/xen/mmu.c:1810: error: 'xen_kmap_atomic_pte' undeclared here (not in a function)
/home/jeremy/hg/xen/paravirt/linux/arch/x86/xen/mmu.c:1816: error: 'xen_set_pte_init' undeclared here (not in a function)
/home/jeremy/hg/xen/paravirt/linux/arch/x86/xen/mmu.c:1824: error: initializer element is not constant
/home/jeremy/hg/xen/paravirt/linux/arch/x86/xen/mmu.c:1824: error: (near initialization for 'xen_mmu_ops.pte_val')
/home/jeremy/hg/xen/paravirt/linux/arch/x86/xen/mmu.c:1825: error: initializer element is not constant
/home/jeremy/hg/xen/paravirt/linux/arch/x86/xen/mmu.c:1825: error: (near initialization for 'xen_mmu_ops.pgd_val')
/home/jeremy/hg/xen/paravirt/linux/arch/x86/xen/mmu.c:1827: error: initializer element is not constant
/home/jeremy/hg/xen/paravirt/linux/arch/x86/xen/mmu.c:1827: error: (near initialization for 'xen_mmu_ops.make_pte')
/home/jeremy/hg/xen/paravirt/linux/arch/x86/xen/mmu.c:1828: error: initializer element is not constant
/home/jeremy/hg/xen/paravirt/linux/arch/x86/xen/mmu.c:1828: error: (near initialization for 'xen_mmu_ops.make_pgd')
/home/jeremy/hg/xen/paravirt/linux/arch/x86/xen/mmu.c:1838: error: initializer element is not constant
/home/jeremy/hg/xen/paravirt/linux/arch/x86/xen/mmu.c:1838: error: (near initialization for 'xen_mmu_ops.make_pmd')
/home/jeremy/hg/xen/paravirt/linux/arch/x86/xen/mmu.c:1839: error: initializer element is not constant
/home/jeremy/hg/xen/paravirt/linux/arch/x86/xen/mmu.c:1839: error: (near initialization for 'xen_mmu_ops.pmd_val')
make[3]: *** [arch/x86/xen/mmu.o] Error 1
make[2]: *** [arch/x86/xen/mmu.o] Error 2
make[1]: *** [sub-make] Error 2
make: *** [all] Error 2


(The errors from 1824 onwards seem to be spurious.)

With the patch the file compiles properly.

    J

View attachment ".config" of type "text/plain" (60679 bytes)