tracing/stack-tracer: introduce CONFIG_USER_STACKTRACE_SUPPORT

Impact: cleanup

User stack tracing is just implemented for x86, but it is not x86 specific.

Introduce a generic config flag, that is currently enabled only for x86.
When other arches implement it, they will have to
SELECT USER_STACKTRACE_SUPPORT.

Signed-off-by: Török Edwin <edwintorok@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 7a146baaa990a0b41e095627a7831739d3c56f7f..e49a4fd718fed0738c35e1d2d15abe1dd93b2cea 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -36,6 +36,7 @@ config X86
        select HAVE_ARCH_TRACEHOOK
        select HAVE_GENERIC_DMA_COHERENT if X86_32
        select HAVE_EFFICIENT_UNALIGNED_ACCESS
+       select USER_STACKTRACE_SUPPORT
 
 config ARCH_DEFCONFIG
        string

diff --git a/include/linux/stacktrace.h b/include/linux/stacktrace.h
index fd42d6851109eb28e5f6b7a631d73348963bcb0c..1a8cecc4f38cd2b91a90f267a54fd39bb4de196b 100644 (file)
--- a/include/linux/stacktrace.h
+++ b/include/linux/stacktrace.h
@@ -16,7 +16,7 @@ extern void save_stack_trace_tsk(struct task_struct *tsk,
 
 extern void print_stack_trace(struct stack_trace *trace, int spaces);
 
-#ifdef CONFIG_X86
+#ifdef CONFIG_USER_STACKTRACE_SUPPORT
 extern void save_stack_trace_user(struct stack_trace *trace);
 #else
 # define save_stack_trace_user(trace)              do { } while (0)

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index b8378fad29a36602e951d6d0d59afbec5a357aa8..87fc34a1bb912b2ffe2eb5dd23ccf24d1c78fb76 100644 (file)
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -3,6 +3,9 @@
 #  select HAVE_FUNCTION_TRACER:
 #
 
+config USER_STACKTRACE_SUPPORT
+       bool
+
 config NOP_TRACER
        bool