From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 21 Mar 2017 16:10:12 +0000 (-0400)
Subject: microblaze: switch to RAW_COPY_USER
X-Git-Tag: Ubuntu-5.4-5.4.0-11.14~7978^2~2^17
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=d491afb8654e84f972ed00cb0e087ad2fae5a1ac;p=mirror_ubuntu-focal-kernel.git

microblaze: switch to RAW_COPY_USER

[kudos to Piotr Sroka for spotting a braino in the previous variant]

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 85885a501dce..1aff3658a104 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -34,6 +34,7 @@ config MICROBLAZE
 	select TRACING_SUPPORT
 	select VIRT_TO_BUS
 	select CPU_NO_EFFICIENT_FFS
+	select ARCH_HAS_RAW_COPY_USER
 
 config SWAP
 	def_bool n
diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h
index 2c39375ac871..38f2c9ccef10 100644
--- a/arch/microblaze/include/asm/uaccess.h
+++ b/arch/microblaze/include/asm/uaccess.h
@@ -336,39 +336,19 @@ extern long __user_bad(void);
 	__gu_err;							\
 })
 
-
-/* copy_to_from_user */
-#define __copy_from_user(to, from, n)	\
-	__copy_tofrom_user((__force void __user *)(to), \
-				(void __user *)(from), (n))
-#define __copy_from_user_inatomic(to, from, n) \
-		__copy_from_user((to), (from), (n))
-
-static inline long copy_from_user(void *to,
-		const void __user *from, unsigned long n)
+static inline unsigned long
+raw_copy_from_user(void *to, const void __user *from, unsigned long n)
 {
-	unsigned long res = n;
-	might_fault();
-	if (likely(access_ok(VERIFY_READ, from, n)))
-		res = __copy_from_user(to, from, n);
-	if (unlikely(res))
-		memset(to + (n - res), 0, res);
-	return res;
+	return __copy_tofrom_user((__force void __user *)to, from, n);
 }
 
-#define __copy_to_user(to, from, n)	\
-		__copy_tofrom_user((void __user *)(to), \
-			(__force const void __user *)(from), (n))
-#define __copy_to_user_inatomic(to, from, n) __copy_to_user((to), (from), (n))
-
-static inline long copy_to_user(void __user *to,
-		const void *from, unsigned long n)
+static inline unsigned long
+raw_copy_to_user(void __user *to, const void *from, unsigned long n)
 {
-	might_fault();
-	if (access_ok(VERIFY_WRITE, to, n))
-		return __copy_to_user(to, from, n);
-	return n;
+	return __copy_tofrom_user(to, (__force const void __user *)from, n);
 }
+#define INLINE_COPY_FROM_USER
+#define INLINE_COPY_TO_USER
 
 /*
  * Copy a null terminated string from userspace.