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[RFC,6/12,not,tested,yet] PPC: introduce copy_in_user() for 32-bit

Message ID 20100504220333.61e44128.takuya.yoshikawa@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Takuya Yoshikawa May 4, 2010, 1:03 p.m. UTC
None
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Patch

diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index bd0fb84..3a01ce8 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -359,6 +359,23 @@  static inline unsigned long copy_to_user(void __user *to,
 	return n;
 }
 
+static inline unsigned long copy_in_user(void __user *to,
+		const void __user *from, unsigned long n)
+{
+	unsigned long over;
+
+	if (likely(access_ok(VERIFY_READ, from, n) &&
+	    access_ok(VERIFY_WRITE, to, n)))
+		return __copy_tofrom_user(to, from, n);
+	if (((unsigned long)from < TASK_SIZE) ||
+	    ((unsigned long)to < TASK_SIZE)) {
+		over = max((unsigned long)from, (unsigned long)to)
+			+ n - TASK_SIZE;
+		return __copy_tofrom_user(to, from, n - over) + over;
+	}
+	return n;
+}
+
 #else /* __powerpc64__ */
 
 #define __copy_in_user(to, from, size) \