powerpc/kgdb: Do not set kgdb_single_step on ppc

The kgdb_single_step flag has the possibility to indefinitely
hang the system on an SMP system.

The x86 arch have the same problem, and that problem was fixed by
commit 8097551d9ab9b9e3630(kgdb,x86: do not set kgdb_single_step
on x86). This patch does the same behaviors as x86's patch.

Signed-off-by: Dongdong Deng <[email protected]>
Signed-off-by: Jason Wessel <[email protected]>
Signed-off-by: Benjamin Herrenschmidt <[email protected]>

diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c
index 782bd0a3c2f0f95496b1b144ebb3ec6e6218e0f8..bbabc5abb1c43d62dd2a69760511dcefd66c5ad5 100644 (file)
--- a/arch/powerpc/kernel/kgdb.c
+++ b/arch/powerpc/kernel/kgdb.c
@@ -410,7 +410,6 @@ int kgdb_arch_handle_exception(int vector, int signo, int err_code,
 #else
                        linux_regs->msr |= MSR_SE;
 #endif
-                       kgdb_single_step = 1;
                        atomic_set(&kgdb_cpu_doing_single_step,
                                   raw_smp_processor_id());
                }