powerpc/4xx: Fix erroneous xmon warning on PowerPC 4xx

The xmon code relies on MSR_RI being non-zero to indicate that an exception
is recoverable.  If it is not, it prints a warning message.  However, the
PowerPC 4xx cores do not have an MSR_RI bit and this warning is produced for
every xmon event.

This introduces an unrecoverable_excp function to determine if an exception
is recoverable or not.  This gets rid of the erroneous warnings on 4xx.

Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 13 insertions, 3 deletions

diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 0e09a45ac79a..c6f0a71b405e 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -335,6 +335,16 @@ int cpus_are_in_xmon(void)
 }
 #endif
 
+static inline int unrecoverable_excp(struct pt_regs *regs)
+{
+#ifdef CONFIG_4xx
+        /* We have no MSR_RI bit on 4xx, so we simply return false */
+        return 0;
+#else
+        return ((regs->msr & MSR_RI) == 0);
+#endif
+}
+
 static int xmon_core(struct pt_regs *regs, int fromipi)
 {
         int cmd = 0;
@@ -388,7 +398,7 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
         bp = NULL;
         if ((regs->msr & (MSR_IR|MSR_PR|MSR_SF)) == (MSR_IR|MSR_SF))
                 bp = at_breakpoint(regs->nip);
-        if (bp || (regs->msr & MSR_RI) == 0)
+        if (bp || unrecoverable_excp(regs))
                 fromipi = 0;
 
         if (!fromipi) {
@@ -399,7 +409,7 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
                                cpu, BP_NUM(bp));
                         xmon_print_symbol(regs->nip, " ", ")\n");
                 }
-                if ((regs->msr & MSR_RI) == 0)
+                if (unrecoverable_excp(regs))
                         printf("WARNING: exception is not recoverable, "
                                "can't continue\n");
                 release_output_lock();
@@ -490,7 +500,7 @@ static int xmon_core(struct pt_regs *regs, int fromipi)
                         printf("Stopped at breakpoint %x (", BP_NUM(bp));
                         xmon_print_symbol(regs->nip, " ", ")\n");
                 }
-                if ((regs->msr & MSR_RI) == 0)
+                if (unrecoverable_excp(regs))
                         printf("WARNING: exception is not recoverable, "
                                "can't continue\n");
                 remove_bpts();