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    Subject[PATCH 24/28] debug_core,kdb: Allow the debug core to process a recursive debug entry
    Date
    This allows kdb to debug a crash with in the kms code with a
    single level recursive re-entry.

    Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
    ---
    kernel/debug/debug_core.c | 7 +++++++
    1 files changed, 7 insertions(+), 0 deletions(-)

    diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c
    index ef46af3..bfdba97 100644
    --- a/kernel/debug/debug_core.c
    +++ b/kernel/debug/debug_core.c
    @@ -445,6 +445,10 @@ static int kgdb_reenter_check(struct kgdb_state *ks)
    }

    printk(KERN_CRIT "KGDB: re-enter exception: ALL breakpoints killed\n");
    +#ifdef CONFIG_KGDB_KDB
    + /* Allow kdb to debug itself one level */
    + return 0;
    +#endif
    dump_stack();
    panic("Recursive entry to debugger");

    @@ -489,6 +493,9 @@ acquirelock:
    smp_wmb();
    atomic_set(&cpu_in_kgdb[cpu], 1);

    + if (exception_level == 1)
    + goto cpu_master_loop;
    +
    /*
    * CPU will loop if it is a slave or request to become a kgdb
    * master cpu and acquire the kgdb_active lock:
    --
    1.6.4.rc1


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