Merge branch 'x86/asm' into locking/core

We need the ASM_UNREACHABLE() macro for a dependent patch.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

3 files changed, 39 insertions, 4 deletions

diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index 7ef015eb3403..b4531e3b2120 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -915,6 +915,9 @@ extern void ioport_unmap(void __iomem *p);
 #endif /* CONFIG_GENERIC_IOMAP */
 #endif /* CONFIG_HAS_IOPORT_MAP */
 
+/*
+ * Convert a virtual cached pointer to an uncached pointer
+ */
 #ifndef xlate_dev_kmem_ptr
 #define xlate_dev_kmem_ptr xlate_dev_kmem_ptr
 static inline void *xlate_dev_kmem_ptr(void *addr)
@@ -954,6 +957,14 @@ static inline void *bus_to_virt(unsigned long address)
 
 #ifndef memset_io
 #define memset_io memset_io
+/**
+ * memset_io	Set a range of I/O memory to a constant value
+ * @addr:	The beginning of the I/O-memory range to set
+ * @val:	The value to set the memory to
+ * @count:	The number of bytes to set
+ *
+ * Set a range of I/O memory to a given value.
+ */
 static inline void memset_io(volatile void __iomem *addr, int value,
 			     size_t size)
 {
@@ -963,6 +974,14 @@ static inline void memset_io(volatile void __iomem *addr, int value,
 
 #ifndef memcpy_fromio
 #define memcpy_fromio memcpy_fromio
+/**
+ * memcpy_fromio	Copy a block of data from I/O memory
+ * @dst:		The (RAM) destination for the copy
+ * @src:		The (I/O memory) source for the data
+ * @count:		The number of bytes to copy
+ *
+ * Copy a block of data from I/O memory.
+ */
 static inline void memcpy_fromio(void *buffer,
 				 const volatile void __iomem *addr,
 				 size_t size)
@@ -973,6 +992,14 @@ static inline void memcpy_fromio(void *buffer,
 
 #ifndef memcpy_toio
 #define memcpy_toio memcpy_toio
+/**
+ * memcpy_toio		Copy a block of data into I/O memory
+ * @dst:		The (I/O memory) destination for the copy
+ * @src:		The (RAM) source for the data
+ * @count:		The number of bytes to copy
+ *
+ * Copy a block of data to I/O memory.
+ */
 static inline void memcpy_toio(volatile void __iomem *addr, const void *buffer,
 			       size_t size)
 {
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index bdb80c4aef6e..10825052b03f 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -203,11 +203,16 @@
 
 #ifdef CONFIG_STACK_VALIDATION
 #define annotate_unreachable() ({					\
-	asm("%c0:\t\n"							\
-	    ".pushsection .discard.unreachable\t\n"			\
-	    ".long %c0b - .\t\n"					\
-	    ".popsection\t\n" : : "i" (__LINE__));			\
+	asm("%c0:\n\t"							\
+	    ".pushsection .discard.unreachable\n\t"			\
+	    ".long %c0b - .\n\t"					\
+	    ".popsection\n\t" : : "i" (__LINE__));			\
 })
+#define ASM_UNREACHABLE							\
+	"999:\n\t"							\
+	".pushsection .discard.unreachable\n\t"				\
+	".long 999b - .\n\t"						\
+	".popsection\n\t"
 #else
 #define annotate_unreachable()
 #endif
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index eca8ad75e28b..e25746d88697 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -185,6 +185,9 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
 #endif
 
 /* Unreachable code */
+#ifndef ASM_UNREACHABLE
+# define ASM_UNREACHABLE
+#endif
 #ifndef unreachable
 # define unreachable() do { } while (1)
 #endif