Merge branch 'for-linus' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm

* 'for-linus' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm: (81 commits)
  ARM: 7133/1: SMP: fix per cpu timer setup before the cpu is marked online
  ARM: 7129/1: Add __arm_ioremap_exec for mapping external memory as MT_MEMORY
  ARM: 7136/1: pl330: Fix a race condition
  ARM: smp: fix clipping of number of CPUs
  ARM: 7137/1: Fix error upon adding LL debug
  ARM: Add a few machine types to mach-types
  ARM: 7130/1: dev_archdata: add private iommu extension
  ARM: 7125/1: Add unwinding annotations for 64bit division functions
  ARM: 7120/1: remove bashism in check for multiple zreladdrs
  ARM: 7118/1: rename temp variable in read*_relaxed()
  ARM: 6217/4: mach-realview: expose PB1176 ROM using physmap and map_rom
  ARM: 7098/1: kdump: copy kernel relocation code at the kexec prepare stage
  ARM: 7062/1: cache: detect PIPT I-cache using CTR
  ARM: platform fixups: remove mdesc argument to fixup function
  ARM: 7017/1: Use generic BUG() handler
  ARM: 7102/1: mach-integrator: update defconfig
  ARM: 7087/2: mach-integrator: get timer frequency from clock
  ARM: 7086/2: mach-integrator: modernize clock event registration
  ARM: 7085/2: mach-integrator: clockevent supports oneshot mode
  ARM: 7084/1: mach-integrator: retire some timer macros
  ...

1 files changed, 46 insertions, 9 deletions

diff --git a/arch/arm/include/asm/bug.h b/arch/arm/include/asm/bug.h
index 4d88425a416..9abe7a07d5a 100644
--- a/arch/arm/include/asm/bug.h
+++ b/arch/arm/include/asm/bug.h
@@ -3,21 +3,58 @@
 
 
 #ifdef CONFIG_BUG
-#ifdef CONFIG_DEBUG_BUGVERBOSE
-extern void __bug(const char *file, int line) __attribute__((noreturn));
-
-/* give file/line information */
-#define BUG()		__bug(__FILE__, __LINE__)
 
+/*
+ * Use a suitable undefined instruction to use for ARM/Thumb2 bug handling.
+ * We need to be careful not to conflict with those used by other modules and
+ * the register_undef_hook() system.
+ */
+#ifdef CONFIG_THUMB2_KERNEL
+#define BUG_INSTR_VALUE 0xde02
+#define BUG_INSTR_TYPE ".hword "
 #else
+#define BUG_INSTR_VALUE 0xe7f001f2
+#define BUG_INSTR_TYPE ".word "
+#endif
 
-/* this just causes an oops */
-#define BUG()		do { *(int *)0 = 0; } while (1)
 
-#endif
+#define BUG() _BUG(__FILE__, __LINE__, BUG_INSTR_VALUE)
+#define _BUG(file, line, value) __BUG(file, line, value)
+
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+
+/*
+ * The extra indirection is to ensure that the __FILE__ string comes through
+ * OK. Many version of gcc do not support the asm %c parameter which would be
+ * preferable to this unpleasantness. We use mergeable string sections to
+ * avoid multiple copies of the string appearing in the kernel image.
+ */
+
+#define __BUG(__file, __line, __value)				\
+do {								\
+	BUILD_BUG_ON(sizeof(struct bug_entry) != 12);		\
+	asm volatile("1:\t" BUG_INSTR_TYPE #__value "\n"	\
+		".pushsection .rodata.str, \"aMS\", %progbits, 1\n" \
+		"2:\t.asciz " #__file "\n" 			\
+		".popsection\n" 				\
+		".pushsection __bug_table,\"a\"\n"		\
+		"3:\t.word 1b, 2b\n"				\
+		"\t.hword " #__line ", 0\n"			\
+		".popsection");					\
+	unreachable();						\
+} while (0)
+
+#else  /* not CONFIG_DEBUG_BUGVERBOSE */
+
+#define __BUG(__file, __line, __value)				\
+do {								\
+	asm volatile(BUG_INSTR_TYPE #__value);			\
+	unreachable();						\
+} while (0)
+#endif  /* CONFIG_DEBUG_BUGVERBOSE */
 
 #define HAVE_ARCH_BUG
-#endif
+#endif  /* CONFIG_BUG */
 
 #include <asm-generic/bug.h>