commit dcd5c1662db59a6b82942f47fb6ac9dd63f6d3dd
author Frederic Weisbecker <fweisbec@gmail.com> Tue Mar 16 01:05:02 2010 +0100
committer Ingo Molnar <mingo@elte.hu> Wed Mar 17 12:26:49 2010 +0100
tree 432f0d89d45fc62d666d46e591ffe109f111cb1e
parent 9f591fd76afdc0e5192e9ed00a36f8efc0b4dfe6

perf: Fix unexported generic perf_arch_fetch_caller_regs

perf_arch_fetch_caller_regs() is exported for the overriden x86
version, but not for the generic weak version.

As a general rule, weak functions should not have their symbol
exported in the same file they are defined.

So let's export it on trace_event_perf.c as it is used by trace
events only.

This fixes:

	ERROR: ".perf_arch_fetch_caller_regs" [fs/xfs/xfs.ko] undefined!
	ERROR: ".perf_arch_fetch_caller_regs" [arch/powerpc/platforms/cell/spufs/spufs.ko] undefined!

-v2: And also only build it if trace events are enabled.
-v3: Fix changelog mistake

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1268697902-9518-1-git-send-regression-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/cpu/perf_event.c

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 7645fae..60398a0 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -1702,6 +1702,7 @@
 	return entry;
 }
 
+#ifdef CONFIG_EVENT_TRACING
 void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip, int skip)
 {
 	regs->ip = ip;
@@ -1713,4 +1714,4 @@
 	regs->cs = __KERNEL_CS;
 	local_save_flags(regs->flags);
 }
-EXPORT_SYMBOL_GPL(perf_arch_fetch_caller_regs);
+#endif

kernel/perf_event.c

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index fb3031c..574ee58 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -2786,10 +2786,12 @@
 	return NULL;
 }
 
+#ifdef CONFIG_EVENT_TRACING
 __weak
 void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip, int skip)
 {
 }
+#endif
 
 /*
  * Output

kernel/trace/trace_event_perf.c

diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 0709e4f..7d79a10 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -12,6 +12,8 @@
 DEFINE_PER_CPU(struct pt_regs, perf_trace_regs);
 EXPORT_PER_CPU_SYMBOL_GPL(perf_trace_regs);
 
+EXPORT_SYMBOL_GPL(perf_arch_fetch_caller_regs);
+
 static char *perf_trace_buf;
 static char *perf_trace_buf_nmi;