Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc

* git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: (36 commits)
  [POWERPC] Generic BUG for powerpc
  [PPC] Fix compile failure do to introduction of PHY_POLL
  [POWERPC] Only export __mtdcr/__mfdcr if CONFIG_PPC_DCR is set
  [POWERPC] Remove old dcr.S
  [POWERPC] Fix SPU coredump code for max_fdset removal
  [POWERPC] Fix irq routing on some 32-bit PowerMacs
  [POWERPC] ps3: Add vuart support
  [POWERPC] Support ibm,dynamic-reconfiguration-memory nodes
  [POWERPC] dont allow pSeries_probe to succeed without initialising MMU
  [POWERPC] micro optimise pSeries_probe
  [POWERPC] Add SPURR SPR to sysfs
  [POWERPC] Add DSCR SPR to sysfs
  [POWERPC] Fix 440SPe CPU table entry
  [POWERPC] Add support for FP emulation for the e300c2 core
  [POWERPC] of_device_register: propagate device_create_file return code
  [POWERPC] Fix mmap of PCI resource with hack for X
  [POWERPC] iSeries: head_64.o needs to depend on lparmap.s
  [POWERPC] cbe_thermal: Fix initialization of sysfs attribute_group
  [POWERPC] Remove QE header files from lite5200.c
  [POWERPC] of_platform_make_bus_id(): make `magic' int
  ...

1 files changed, 8 insertions, 48 deletions

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 0d4e203fa7a..535f5066564 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -32,6 +32,7 @@
 #include <linux/kprobes.h>
 #include <linux/kexec.h>
 #include <linux/backlight.h>
+#include <linux/bug.h>
 
 #include <asm/kdebug.h>
 #include <asm/pgtable.h>
@@ -727,54 +728,9 @@ static int emulate_instruction(struct pt_regs *regs)
 	return -EINVAL;
 }
 
-/*
- * Look through the list of trap instructions that are used for BUG(),
- * BUG_ON() and WARN_ON() and see if we hit one.  At this point we know
- * that the exception was caused by a trap instruction of some kind.
- * Returns 1 if we should continue (i.e. it was a WARN_ON) or 0
- * otherwise.
- */
-extern struct bug_entry __start___bug_table[], __stop___bug_table[];
-
-#ifndef CONFIG_MODULES
-#define module_find_bug(x)	NULL
-#endif
-
-struct bug_entry *find_bug(unsigned long bugaddr)
+int is_valid_bugaddr(unsigned long addr)
 {
-	struct bug_entry *bug;
-
-	for (bug = __start___bug_table; bug < __stop___bug_table; ++bug)
-		if (bugaddr == bug->bug_addr)
-			return bug;
-	return module_find_bug(bugaddr);
-}
-
-static int check_bug_trap(struct pt_regs *regs)
-{
-	struct bug_entry *bug;
-	unsigned long addr;
-
-	if (regs->msr & MSR_PR)
-		return 0;	/* not in kernel */
-	addr = regs->nip;	/* address of trap instruction */
-	if (addr < PAGE_OFFSET)
-		return 0;
-	bug = find_bug(regs->nip);
-	if (bug == NULL)
-		return 0;
-	if (bug->line & BUG_WARNING_TRAP) {
-		/* this is a WARN_ON rather than BUG/BUG_ON */
-		printk(KERN_ERR "Badness in %s at %s:%ld\n",
-		       bug->function, bug->file,
-		       bug->line & ~BUG_WARNING_TRAP);
-		dump_stack();
-		return 1;
-	}
-	printk(KERN_CRIT "kernel BUG in %s at %s:%ld!\n",
-	       bug->function, bug->file, bug->line);
-
-	return 0;
+	return is_kernel_addr(addr);
 }
 
 void __kprobes program_check_exception(struct pt_regs *regs)
@@ -782,6 +738,8 @@ void __kprobes program_check_exception(struct pt_regs *regs)
 	unsigned int reason = get_reason(regs);
 	extern int do_mathemu(struct pt_regs *regs);
 
+	/* We can now get here via a FP Unavailable exception if the core
+	 * has no FPU, in that case no reason flags will be set */
 #ifdef CONFIG_MATH_EMULATION
 	/* (reason & REASON_ILLEGAL) would be the obvious thing here,
 	 * but there seems to be a hardware bug on the 405GP (RevD)
@@ -808,7 +766,9 @@ void __kprobes program_check_exception(struct pt_regs *regs)
 			return;
 		if (debugger_bpt(regs))
 			return;
-		if (check_bug_trap(regs)) {
+
+		if (!(regs->msr & MSR_PR) &&  /* not user-mode */
+		    report_bug(regs->nip) == BUG_TRAP_TYPE_WARN) {
 			regs->nip += 4;
 			return;
 		}