@@ -98,6 +98,43 @@ struct exception_table_entry {
extern int fixup_exception(struct pt_regs *regs);
+/**
+ * set_bit_user: - Set a bit of a bitmap in user space.
+ * @nr: Bit offset to set.
+ * @addr: Base address, in user space.
+ *
+ * Context: User context only. This function may sleep.
+ *
+ * This macro sets a bit of a bitmap in user space. Note that this
+ * is same as __set_bit but not set_bit in the sense that setting
+ * the bit is not done atomically.
+ *
+ * Returns zero on success, -EFAULT on error.
+ */
+#define __set_bit_user_asm(nr, addr, err, errret) \
+ asm volatile("1: bts %1,%2\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3: mov %3,%0\n" \
+ " jmp 2b\n" \
+ ".previous\n" \
+ _ASM_EXTABLE(1b, 3b) \
+ : "=r"(err) \
+ : "r" (nr), "m" (__m(addr)), "i" (errret), "0" (err))
+
+#define set_bit_user(nr, addr) \
+({ \
+ int __ret_sbu = 0; \
+ \
+ might_fault(); \
+ if (access_ok(VERIFY_WRITE, addr, nr/8 + 1)) \
+ __set_bit_user_asm(nr, addr, __ret_sbu, -EFAULT); \
+ else \
+ __ret_sbu = -EFAULT; \
+ \
+ __ret_sbu; \
+})
+
/*
* These are the main single-value transfer routines. They automatically
* use the right size if we just have the right pointer type.