This allows kdb to debug a crash with in the kms code with a single level recursive re-entry.
Signed-off-by: Jason Wessel <[email protected]> --- 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 e44e693..e6c6f8a 100644 --- a/kernel/debug/debug_core.c +++ b/kernel/debug/debug_core.c @@ -443,6 +443,10 @@ 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"); @@ -487,6 +491,9 @@ 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 _______________________________________________ kdb mailing list [email protected] http://oss.sgi.com/mailman/listinfo/kdb
