[tip:perf/nmi] nmi_watchdog: Fix undefined 'apic' build bug

[tip-bot for Don Zickus]

Commit-ID:  2cc4452bc31fc1cde6f0b64a4eb13269f982787d
Gitweb:     http://git.kernel.org/tip/2cc4452bc31fc1cde6f0b64a4eb13269f982787d
Author:     Don Zickus <dzickus@xxxxxxxxxx>
AuthorDate: Thu, 18 Feb 2010 21:56:52 -0500
Committer:  Ingo Molnar <mingo@xxxxxxx>
CommitDate: Fri, 19 Feb 2010 23:04:13 +0100

nmi_watchdog: Fix undefined 'apic' build bug

Ingo provided me a config that fails to compile with:

  arch/x86/built-in.o: In function
  `arch_trigger_all_cpu_backtrace': (.text+0x17e78): undefined
  reference to `apic' make: *** [.tmp_vmlinux1] Error 1

I realized I changed the compile behaviour of the nmi code by
not wrapping it with CONFIG_LOCAL_APIC.  To fix this I add a
compile check for ARCH_HAS_NMI_WATCHDOG around
arch_trigger_all_cpu_backtrace.

Signed-off-by: Don Zickus <dzickus@xxxxxxxxxx>
Cc: a.p.zijlstra@xxxxxxxxx
Cc: gorcunov@xxxxxxxxx
Cc: aris@xxxxxxxxxx
LKML-Reference: <1266548212-24243-1-git-send-email-dzickus@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
 arch/x86/kernel/apic/hw_nmi.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/apic/hw_nmi.c b/arch/x86/kernel/apic/hw_nmi.c
index 312d772..0b4d205 100644
--- a/arch/x86/kernel/apic/hw_nmi.c
+++ b/arch/x86/kernel/apic/hw_nmi.c
@@ -92,6 +92,7 @@ u64 hw_nmi_get_sample_period(void)
         return cpu_khz * 1000;
 }
 
+#ifdef ARCH_HAS_NMI_WATCHDOG
 void arch_trigger_all_cpu_backtrace(void)
 {
 	int i;
@@ -108,6 +109,7 @@ void arch_trigger_all_cpu_backtrace(void)
 		mdelay(1);
 	}
 }
+#endif
 
 /* STUB calls to mimic old nmi_watchdog behaviour */
 #if defined(CONFIG_X86_LOCAL_APIC)
--
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