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    Subject[PATCH v4 3.0-rc2-tip 15/22] 15: uprobes: register a notifier for uprobes.

    Uprobe needs to be intimated on int3 and singlestep exceptions.
    Hence uprobes registers a die notifier so that its notified of the events.

    Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
    Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
    ---
    kernel/uprobes.c | 18 ++++++++++++++++++
    1 files changed, 18 insertions(+), 0 deletions(-)

    diff --git a/kernel/uprobes.c b/kernel/uprobes.c
    index 1e88d64..95c16dd 100644
    --- a/kernel/uprobes.c
    +++ b/kernel/uprobes.c
    @@ -36,6 +36,7 @@
    #include <linux/mman.h> /* needed for PROT_EXEC, MAP_PRIVATE */
    #include <linux/file.h> /* needed for fput() */
    #include <linux/init_task.h> /* init_cred */
    +#include <linux/kdebug.h> /* for notifier mechanism */

    #define UINSNS_PER_PAGE (PAGE_SIZE/UPROBES_XOL_SLOT_BYTES)
    #define MAX_UPROBES_XOL_SLOTS UINSNS_PER_PAGE
    @@ -1456,3 +1457,20 @@ int uprobe_post_notifier(struct pt_regs *regs)
    set_thread_flag(TIF_UPROBE);
    return 1;
    }
    +
    +struct notifier_block uprobe_exception_nb = {
    + .notifier_call = uprobe_exception_notify,
    + .priority = INT_MAX - 1, /* notified after kprobes, kgdb */
    +};
    +
    +static int __init init_uprobes(void)
    +{
    + return register_die_notifier(&uprobe_exception_nb);
    +}
    +
    +static void __exit exit_uprobes(void)
    +{
    +}
    +
    +module_init(init_uprobes);
    +module_exit(exit_uprobes);

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