[PATCH 2.6.18-rc4 08/10] Keep the __init functions after initialization

From: Catalin Marinas
Date: Sat Aug 12 2006 - 17:59:13 EST

From: Catalin Marinas <catalin.marinas@xxxxxxx>

This patch adds the CONFIG_DEBUG_KEEP_INIT option which preserves the
.init.text section after initialization. Memory leaks happening during this
phase can be more easily tracked.

Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>

include/linux/init.h | 4 ++++
lib/Kconfig.debug | 12 ++++++++++++
2 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/include/linux/init.h b/include/linux/init.h
index 6667785..1590e9a 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -40,7 +40,11 @@ #include <linux/compiler.h>

/* These are for everybody (although not all archs will actually
discard it in modules) */
+#define __init
#define __init __attribute__ ((__section__ (".init.text")))
#define __initdata __attribute__ ((__section__ (".init.data")))
#define __exitdata __attribute__ ((__section__(".exit.data")))
#define __exit_call __attribute_used__ __attribute__ ((__section__ (".exitcall.exit")))
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 77ddb7d..c8ca3d6 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -185,6 +185,18 @@ config DEBUG_MEMLEAK_REPORTS_NR
reading the /sys/kernel/debug/memleak file could lead to
some soft-locks.

+ bool "Do not free the __init functions"
+ default n
+ depends on DEBUG_MEMLEAK
+ help
+ This option moves the __init functions out of the .init.text
+ section and therefore they are no longer freed after the
+ kernel initialization. It is useful for identifying memory
+ leaks happening during the kernel or modules initialization.
+ If unsure, say N.
bool "Debug preemptible kernel"
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