[RFC PATCH v4 18/34] early kprobes: add CONFIG_EARLY_KPROBES option.
From: Wang Nan
Date: Mon Mar 02 2015 - 09:26:54 EST
Enable early kprobes in Kconfig.
Currently only allow early kprobes for ARM. Following patchs will deal
with KPROBES_ON_FTRACE. After that x86 will also be enabled.
Signed-off-by: Wang Nan <wangnan0@xxxxxxxxxx>
---
arch/Kconfig | 19 +++++++++++++++++++
arch/arm/Kconfig | 1 +
2 files changed, 20 insertions(+)
diff --git a/arch/Kconfig b/arch/Kconfig
index 05d7a8a..8a772ab 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -46,6 +46,22 @@ config KPROBES
for kernel debugging, non-intrusive instrumentation and testing.
If in doubt, say "N".
+config EARLY_KPROBES
+ bool "Enable kprobes at very early booting stage"
+ depends on KPROBES
+ depends on HAVE_EARLY_KPROBES
+ def_bool y
+ help
+ Enable kprobe at very early booting stage.
+
+config NR_EARLY_KPROBES_SLOTS
+ int "Number of possible early kprobes"
+ range 1 64
+ default 16
+ depends on EARLY_KPROBES
+ help
+ Number of early kprobes slots.
+
config JUMP_LABEL
bool "Optimize very unlikely/likely branches"
depends on HAVE_ARCH_JUMP_LABEL
@@ -170,6 +186,9 @@ config HAVE_IOREMAP_PROT
config HAVE_KPROBES
bool
+config HAVE_EARLY_KPROBES
+ bool
+
config HAVE_KRETPROBES
bool
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 9f1f09a..84ad7f9 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -43,6 +43,7 @@ config ARM
select HAVE_DMA_ATTRS
select HAVE_DMA_CONTIGUOUS if MMU
select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL)
+ select HAVE_EARLY_KPROBES if (HAVE_KPROBES)
select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
--
1.8.4
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