From: Arnd Bergmann <arnd@arndb.de>
Date: Sat, 8 May 2021 12:58:46 +0000 (+0200)
Subject: asm-generic: uaccess: 1-byte access is always aligned
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=d40d8179482c330df5b9049797fe94c2e8eb4f6e;p=uclinux-h8%2Flinux.git

asm-generic: uaccess: 1-byte access is always aligned

With the cleaned up version of asm-generic/unaligned.h,
there is a warning about the get_user/put_user helpers using
unaligned access for single-byte variables:

include/asm-generic/uaccess.h: In function ‘__get_user_fn’:
include/asm-generic/unaligned.h:13:15: warning: ‘packed’ attribute ignored for field of type ‘u8’ {aka ‘unsigned char’} [-Wattributes]
  const struct { type x __packed; } *__pptr = (typeof(__pptr))(ptr); \

Change these to use a direct pointer dereference to avoid the
warnings.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---

diff --git a/include/asm-generic/uaccess.h b/include/asm-generic/uaccess.h
index 4973328f3c6e..a0b2f270dddc 100644
--- a/include/asm-generic/uaccess.h
+++ b/include/asm-generic/uaccess.h
@@ -19,7 +19,7 @@ __get_user_fn(size_t size, const void __user *from, void *to)
 
 	switch (size) {
 	case 1:
-		*(u8 *)to = get_unaligned((u8 __force *)from);
+		*(u8 *)to = *((u8 __force *)from);
 		return 0;
 	case 2:
 		*(u16 *)to = get_unaligned((u16 __force *)from);
@@ -45,7 +45,7 @@ __put_user_fn(size_t size, void __user *to, void *from)
 
 	switch (size) {
 	case 1:
-		put_unaligned(*(u8 *)from, (u8 __force *)to);
+		*(u8 __force *)to = *(u8 *)from;
 		return 0;
 	case 2:
 		put_unaligned(*(u16 *)from, (u16 __force *)to);