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Subject[PATCH 2.6.20-rc1 08/10] Keep the __init functions after initialization
Date
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@gmail.com>
---

include/linux/init.h | 5 +++++
lib/Kconfig.debug | 12 ++++++++++++
2 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/include/linux/init.h b/include/linux/init.h
index 5a593a1..eecdb17 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -40,8 +40,13 @@

/* These are for everybody (although not all archs will actually
discard it in modules) */
+#ifdef CONFIG_DEBUG_KEEP_INIT
+#define __init
+#define __initdata
+#else
#define __init __attribute__ ((__section__ (".init.text")))
#define __initdata __attribute__ ((__section__ (".init.data")))
+#endif
#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 42f60fb..9695af1 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -251,6 +251,18 @@ config DEBUG_MEMLEAK_REPORTS_NR
reading the /sys/kernel/debug/memleak file could lead to
some soft-locks.

+config DEBUG_KEEP_INIT
+ bool "Do not free the __init code/data"
+ default n
+ depends on DEBUG_MEMLEAK
+ help
+ This option moves the __init code/data out of the
+ .init.text/.init.data sections. It is useful for identifying
+ memory leaks happening during the kernel or modules
+ initialization.
+
+ If unsure, say N.
+
config DEBUG_PREEMPT
bool "Debug preemptible kernel"
depends on DEBUG_KERNEL && PREEMPT && TRACE_IRQFLAGS_SUPPORT
-
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