[IA64] honor notify_die() returning NOTIFY_STOP

This requires making die() and die_if_kernel() return a value, and their
callers to honor this (and be prepared that it returns).

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>

4 files changed, 39 insertions, 22 deletions

diff --git a/arch/ia64/ia32/ia32_support.c b/arch/ia64/ia32/ia32_support.c
index d1d50cd1c38..896b1ebbfb2 100644
--- a/arch/ia64/ia32/ia32_support.c
+++ b/arch/ia64/ia32/ia32_support.c
@@ -27,7 +27,7 @@
 
 #include "ia32priv.h"
 
-extern void die_if_kernel (char *str, struct pt_regs *regs, long err);
+extern int die_if_kernel (char *str, struct pt_regs *regs, long err);
 
 struct exec_domain ia32_exec_domain;
 struct page *ia32_shared_page[NR_CPUS];
@@ -217,7 +217,8 @@ ia32_bad_interrupt (unsigned long int_num, struct pt_regs *regs)
 {
         siginfo_t siginfo;
 
-        die_if_kernel("Bad IA-32 interrupt", regs, int_num);
+        if (die_if_kernel("Bad IA-32 interrupt", regs, int_num))
+                return;
 
         siginfo.si_signo = SIGTRAP;
         siginfo.si_errno = int_num;     /* XXX is it OK to abuse si_errno like this? */
diff --git a/arch/ia64/kernel/traps.c b/arch/ia64/kernel/traps.c
index 78d65cb947d..f0cda765e68 100644
--- a/arch/ia64/kernel/traps.c
+++ b/arch/ia64/kernel/traps.c
@@ -35,7 +35,7 @@ trap_init (void)
                 fpswa_interface = __va(ia64_boot_param->fpswa);
 }
 
-void
+int
 die (const char *str, struct pt_regs *regs, long err)
 {
         static struct {
@@ -62,8 +62,11 @@ die (const char *str, struct pt_regs *regs, long err)
         if (++die.lock_owner_depth < 3) {
                 printk("%s[%d]: %s %ld [%d]\n",
                 current->comm, task_pid_nr(current), str, err, ++die_counter);
-                (void) notify_die(DIE_OOPS, (char *)str, regs, err, 255, SIGSEGV);
-                show_regs(regs);
+                if (notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV)
+                    != NOTIFY_STOP)
+                        show_regs(regs);
+                else
+                        regs = NULL;
         } else
                 printk(KERN_ERR "Recursive die() failure, output suppressed\n");
 
@@ -72,17 +75,22 @@ die (const char *str, struct pt_regs *regs, long err)
         add_taint(TAINT_DIE);
         spin_unlock_irq(&die.lock);
 
+        if (!regs)
+                return 1;
+
         if (panic_on_oops)
                 panic("Fatal exception");
 
         do_exit(SIGSEGV);
+        return 0;
 }
 
-void
+int
 die_if_kernel (char *str, struct pt_regs *regs, long err)
 {
         if (!user_mode(regs))
-                die(str, regs, err);
+                return die(str, regs, err);
+        return 0;
 }
 
 void
@@ -102,7 +110,8 @@ __kprobes ia64_bad_break (unsigned long break_num, struct pt_regs *regs)
                 if (notify_die(DIE_BREAK, "break 0", regs, break_num, TRAP_BRKPT, SIGTRAP)
                                 == NOTIFY_STOP)
                         return;
-                die_if_kernel("bugcheck!", regs, break_num);
+                if (die_if_kernel("bugcheck!", regs, break_num))
+                        return;
                 sig = SIGILL; code = ILL_ILLOPC;
                 break;
 
@@ -155,8 +164,9 @@ __kprobes ia64_bad_break (unsigned long break_num, struct pt_regs *regs)
                 break;
 
               default:
-                if (break_num < 0x40000 || break_num > 0x100000)
-                        die_if_kernel("Bad break", regs, break_num);
+                if ((break_num < 0x40000 || break_num > 0x100000)
+                    && die_if_kernel("Bad break", regs, break_num))
+                        return;
 
                 if (break_num < 0x80000) {
                         sig = SIGILL; code = __ILL_BREAK;
@@ -402,14 +412,15 @@ ia64_illegal_op_fault (unsigned long ec, long arg1, long arg2, long arg3,
 #endif
 
         sprintf(buf, "IA-64 Illegal operation fault");
-        die_if_kernel(buf, &regs, 0);
+        rv.fkt = 0;
+        if (die_if_kernel(buf, &regs, 0))
+                return rv;
 
         memset(&si, 0, sizeof(si));
         si.si_signo = SIGILL;
         si.si_code = ILL_ILLOPC;
         si.si_addr = (void __user *) (regs.cr_iip + ia64_psr(&regs)->ri);
         force_sig_info(SIGILL, &si, current);
-        rv.fkt = 0;
         return rv;
 }
 
@@ -644,6 +655,6 @@ ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa,
                 sprintf(buf, "Fault %lu", vector);
                 break;
         }
-        die_if_kernel(buf, &regs, error);
-        force_sig(SIGILL, current);
+        if (!die_if_kernel(buf, &regs, error))
+                force_sig(SIGILL, current);
 }
diff --git a/arch/ia64/kernel/unaligned.c b/arch/ia64/kernel/unaligned.c
index f6a1aeb742b..52f70bbc192 100644
--- a/arch/ia64/kernel/unaligned.c
+++ b/arch/ia64/kernel/unaligned.c
@@ -23,7 +23,7 @@
 #include <asm/uaccess.h>
 #include <asm/unaligned.h>
 
-extern void die_if_kernel(char *str, struct pt_regs *regs, long err);
+extern int die_if_kernel(char *str, struct pt_regs *regs, long err);
 
 #undef DEBUG_UNALIGNED_TRAP
 
@@ -675,8 +675,9 @@ emulate_load_updates (update_t type, load_store_t ld, struct pt_regs *regs, unsi
          */
         if (ld.x6_op == 1 || ld.x6_op == 3) {
                 printk(KERN_ERR "%s: register update on speculative load, error\n", __FUNCTION__);
-                die_if_kernel("unaligned reference on speculative load with register update\n",
-                              regs, 30);
+                if (die_if_kernel("unaligned reference on speculative load with register update\n",
+                                  regs, 30))
+                        return;
         }
 
 
@@ -1317,7 +1318,8 @@ ia64_handle_unaligned (unsigned long ifa, struct pt_regs *regs)
 
         if (ia64_psr(regs)->be) {
                 /* we don't support big-endian accesses */
-                die_if_kernel("big-endian unaligned accesses are not supported", regs, 0);
+                if (die_if_kernel("big-endian unaligned accesses are not supported", regs, 0))
+                        return;
                 goto force_sigbus;
         }
 
@@ -1534,7 +1536,8 @@ ia64_handle_unaligned (unsigned long ifa, struct pt_regs *regs)
                         ia64_handle_exception(regs, eh);
                         goto done;
                 }
-                die_if_kernel("error during unaligned kernel access\n", regs, ret);
+                if (die_if_kernel("error during unaligned kernel access\n", regs, ret))
+                        return;
                 /* NOT_REACHED */
         }
   force_sigbus:
diff --git a/arch/ia64/mm/fault.c b/arch/ia64/mm/fault.c
index 7571076a16a..3e69881648a 100644
--- a/arch/ia64/mm/fault.c
+++ b/arch/ia64/mm/fault.c
@@ -16,7 +16,7 @@
 #include <asm/system.h>
 #include <asm/uaccess.h>
 
-extern void die (char *, struct pt_regs *, long);
+extern int die(char *, struct pt_regs *, long);
 
 #ifdef CONFIG_KPROBES
 static inline int notify_page_fault(struct pt_regs *regs, int trap)
@@ -267,9 +267,11 @@ ia64_do_page_fault (unsigned long address, unsigned long isr, struct pt_regs *re
         else
                 printk(KERN_ALERT "Unable to handle kernel paging request at "
                        "virtual address %016lx\n", address);
-        die("Oops", regs, isr);
+        if (die("Oops", regs, isr))
+                regs = NULL;
         bust_spinlocks(0);
-        do_exit(SIGKILL);
+        if (regs)
+                do_exit(SIGKILL);
         return;
 
   out_of_memory: