mm/memory-failure: remove obsolete comment in kill_proc()

When user sets SIGBUS to SIG_IGN, it won't cause loop now.  For action
required mce error, SIGBUS cannot be blocked.  Also when a hwpoisoned page
is re-accessed, kill_accessing_process() will be called to kill the
process.

Link: https://lkml.kernel.org/r/20240612071835.157004-13-linmiaohe@huawei.comSigned-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: David Hildenbrand <david@redhat.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/memory-failure.c

@@ -354,8 +354,6 @@ static int kill_proc(struct to_kill *tk, unsigned long pfn, int flags)
 		 * PF_MCE_EARLY set.
 		 * Don't use force here, it's convenient if the signal
 		 * can be temporarily blocked.
-		 * This could cause a loop when the user sets SIGBUS
-		 * to SIG_IGN, but hopefully no one will do that?
 		 */
 		ret = send_sig_mceerr(BUS_MCEERR_AO, (void __user *)tk->addr,
 				      addr_lsb, t);