powerpc: kill the obsolete code under is_global_init()

The code under "if (is_global_init())" is bogus, and is_global_init()
itself is not right in mt case.

Contrary to what the comment says, nowadays force_sig_info() does kill
init even if the handler is SIG_DFL. Note that force_sig_info() clears
SIGNAL_UNKILLABLE exactly for this case.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 0 insertions, 22 deletions

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 6f0ae1a9bfae..a81c7438d341 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -198,28 +198,6 @@ void _exception(int signr, struct pt_regs *regs, int code, unsigned long addr)
         info.si_code = code;
         info.si_addr = (void __user *) addr;
         force_sig_info(signr, &info, current);
-
-        /*
-         * Init gets no signals that it doesn't have a handler for.
-         * That's all very well, but if it has caused a synchronous
-         * exception and we ignore the resulting signal, it will just
-         * generate the same exception over and over again and we get
-         * nowhere.  Better to kill it and let the kernel panic.
-         */
-        if (is_global_init(current)) {
-                __sighandler_t handler;
-
-                spin_lock_irq(&current->sighand->siglock);
-                handler = current->sighand->action[signr-1].sa.sa_handler;
-                spin_unlock_irq(&current->sighand->siglock);
-                if (handler == SIG_DFL) {
-                        /* init has generated a synchronous exception
-                           and it doesn't have a handler for the signal */
-                        printk(KERN_CRIT "init has generated signal %d "
-                               "but has no handler for it\n", signr);
-                        do_exit(signr);
-                }
-        }
 }
 
 #ifdef CONFIG_PPC64