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    Subject[RFC] [PATCH 2.6.37-rc5-tip 16/20] 16: 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 | 19 +++++++++++++++++++
    1 files changed, 19 insertions(+), 0 deletions(-)

    diff --git a/kernel/uprobes.c b/kernel/uprobes.c
    index 3d21d8f..93a3118 100644
    --- a/kernel/uprobes.c
    +++ b/kernel/uprobes.c
    @@ -34,6 +34,7 @@
    #include <linux/rmap.h> /* needed for anon_vma_prepare */
    #include <linux/mman.h> /* needed for PROT_EXEC, MAP_PRIVATE */
    #include <linux/file.h> /* needed for fput() */
    +#include <linux/kdebug.h> /* needed for notifier mechanism */

    #define UINSNS_PER_PAGE (PAGE_SIZE/UPROBES_XOL_SLOT_BYTES)
    #define MAX_UPROBES_XOL_SLOTS UINSNS_PER_PAGE
    @@ -1170,3 +1171,21 @@ int uprobe_post_notifier(struct pt_regs *regs)
    }
    return 0;
    }
    +
    +struct notifier_block uprobes_exception_nb = {
    + .notifier_call = uprobes_exception_notify,
    + .priority = 0x7ffffff0,
    +};
    +
    +static int __init init_uprobes(void)
    +{
    + register_die_notifier(&uprobes_exception_nb);
    + return 0;
    +}
    +
    +static void __exit exit_uprobes(void)
    +{
    +}
    +
    +module_init(init_uprobes);
    +module_exit(exit_uprobes);

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