[RFC,7/12,not,tested,yet] PPC: introduce __set_bit() like function for bitmaps in user space

Commit Message

Takuya Yoshikawa May 4, 2010, 1:04 p.m. UTC

None

Patch

diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 3a01ce8..f878326 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -321,6 +321,25 @@  do {								\
 	__gu_err;						\
 })
 
+static inline int set_bit_user_non_atomic(int nr, void __user *addr)
+{
+	u8 __user *p;
+	u8 val;
+
+	p = (u8 __user *)((unsigned long)addr + nr / BITS_PER_BYTE);
+	if (!access_ok(VERIFY_WRITE, p, 1))
+		return -EFAULT;
+
+	if (__get_user(val, p))
+		return -EFAULT;
+
+	val |= 1U << (nr % BITS_PER_BYTE);
+	if (__put_user(val, p))
+		return -EFAULT;
+
+	return 0;
+}
+
 
 /* more complex routines */