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>

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 6f0ae1a..a81c743 100644 (file)
--- 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