linux-kernel - Build failure on CONFIG_DEBUG_FORCE_WEAK_PER

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Message-ID: <874od1w1ao.fsf@gmail.com>
Date:	Tue, 05 Oct 2010 16:23:27 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Build failure on CONFIG_DEBUG_FORCE_WEAK_PER_CPU?

Hello,

When I tried to build 2.6.36-rc6 on x86_64 allyesconfig,
I got following messages and the build was broken:

  LD      vmlinux.o
  MODPOST vmlinux.o
  GEN     .version
  CHK     include/generated/compile.h
  UPD     include/generated/compile.h
  CC      init/version.o
  LD      init/built-in.o
  LD      .tmp_vmlinux1
ld: arch/x86/kernel/init_task.o:(.debug_info+0xeee): error: undefined reference to '__pcpu_scope_init_tss'
ld: arch/x86/kernel/init_task.o:(.debug_info+0x1558): error: undefined reference to '__pcpu_unique_init_tss'
ld: arch/x86/built-in.o:(.debug_info+0x2bed2): error: undefined reference to '__pcpu_unique_shared_msrs'
ld: arch/x86/built-in.o:(.debug_info+0x2c037): error: undefined reference to '__pcpu_unique_cpu_tsc_khz'
ld: arch/x86/built-in.o:(.debug_info+0x2c0ab): error: undefined reference to '__pcpu_unique_current_vcpu'
ld: arch/x86/built-in.o:(.debug_info+0x5801a): error: undefined reference to '__pcpu_unique_vmxarea'
ld: arch/x86/built-in.o:(.debug_info+0x58046): error: undefined reference to '__pcpu_unique_current_vmcs'
ld: arch/x86/built-in.o:(.debug_info+0x58072): error: undefined reference to '__pcpu_unique_vcpus_on_cpu'
ld: arch/x86/built-in.o:(.debug_info+0x5809e): error: undefined reference to '__pcpu_unique_host_gdt'
ld: arch/x86/built-in.o:(.debug_info+0x6086f): error: undefined reference to '__pcpu_unique_svm_data'
ld: arch/x86/built-in.o:(.debug_info+0x659ff): error: undefined reference to '__pcpu_scope_xen_vcpu'
ld: arch/x86/built-in.o:(.debug_info+0x65a41): error: undefined reference to '__pcpu_scope_xen_vcpu_info'
ld: arch/x86/built-in.o:(.debug_info+0x65b2c): error: undefined reference to '__pcpu_unique_xen_vcpu'
ld: arch/x86/built-in.o:(.debug_info+0x65b42): error: undefined reference to '__pcpu_unique_xen_vcpu_info'
ld: arch/x86/built-in.o:(.debug_info+0x65b96): error: undefined reference to '__pcpu_unique_idt_desc'
... (snipped)
make[2]: *** [.tmp_vmlinux1] Error 1
make[1]: *** [sub-make] Error 2
make: *** [all] Error 2

After reading comments on CONFIG_DEBUG_FORCE_WEAK_PER_CPU, I am
not sure whether it is intended or not. I think it's not, but
I can't find any report about this though the change was made
last year by 7c756e6e19e71f0327760d8955f7077118ebb2b1. Or Am I
missing something?

Anyway, the breakage was due to conflict between
CONFIG_DEBUG_FORCE_WEAK_PER_CPU and CONFIG_DEBUG_INFO. I think a
kconfig dependency has to be set between them something like:

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 1b4afd2..bb94392 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -634,7 +634,7 @@ config DEBUG_BUGVERBOSE

 config DEBUG_INFO
 	bool "Compile the kernel with debug info"
-	depends on DEBUG_KERNEL
+	depends on DEBUG_KERNEL && !DEBUG_FORCE_WEAK_PER_CPU
 	help
           If you say Y here the resulting kernel image will include
 	  debugging info resulting in a larger kernel image.

-- 
Regards,
Namhyung Kim

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