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    Subject[PATCH 13/15] kmemleak: Keep the __init functions after initialization
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    This patch adds the CONFIG_DEBUG_KEEP_INIT option which preserves the
    .init.* sections after initialization. Memory leaks happening during
    this phase can be more easily tracked.

    Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
    ---
    include/linux/init.h | 6 ++++++
    lib/Kconfig.debug | 12 ++++++++++++
    2 files changed, 18 insertions(+), 0 deletions(-)

    diff --git a/include/linux/init.h b/include/linux/init.h
    index 68cb026..41321ad 100644
    --- a/include/linux/init.h
    +++ b/include/linux/init.h
    @@ -40,9 +40,15 @@

    /* These are for everybody (although not all archs will actually
    discard it in modules) */
    +#ifdef CONFIG_DEBUG_KEEP_INIT
    +#define __init
    +#define __initdata
    +#define __initconst
    +#else
    #define __init __section(.init.text) __cold notrace
    #define __initdata __section(.init.data)
    #define __initconst __section(.init.rodata)
    +#endif
    #define __exitdata __section(.exit.data)
    #define __exit_call __used __section(.exitcall.exit)

    diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
    index 1e59827..72cde77 100644
    --- a/lib/Kconfig.debug
    +++ b/lib/Kconfig.debug
    @@ -313,6 +313,18 @@ config DEBUG_MEMLEAK
    In order to access the memleak file, debugfs needs to be
    mounted (usually at /sys/kernel/debug).

    +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 || PPC64)


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