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authorChristoph Hellwig <hch@lst.de>2019-04-23 18:38:09 +0200
committerArnd Bergmann <arnd@arndb.de>2019-04-23 21:51:41 +0200
commit6edd1dbace0e8529ed167e8a5f9da63c0cc763cc (patch)
tree157e43dccba6b1bd1a4c2bf3277c6b9d7359e850
parentbd79f94758c011bdffd8d4afcfb578d169cb5e93 (diff)
asm-generic: optimize generic uaccess for 8-byte loads and stores
On 64-bit architectures we can also use the direct load/store trick for 8-byte values. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
-rw-r--r--include/asm-generic/uaccess.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/asm-generic/uaccess.h b/include/asm-generic/uaccess.h
index 3dcabfceb21e..e935318804f8 100644
--- a/include/asm-generic/uaccess.h
+++ b/include/asm-generic/uaccess.h
@@ -24,6 +24,11 @@ raw_copy_from_user(void *to, const void __user * from, unsigned long n)
case 4:
*(u32 *)to = *(u32 __force *)from;
return 0;
+#ifdef CONFIG_64BIT
+ case 8:
+ *(u64 *)to = *(u64 __force *)from;
+ return 0;
+#endif
}
}
@@ -45,6 +50,11 @@ raw_copy_to_user(void __user *to, const void *from, unsigned long n)
case 4:
*(u32 __force *)to = *(u32 *)from;
return 0;
+#ifdef CONFIG_64BIT
+ case 8:
+ *(u64 __force *)to = *(u64 *)from;
+ return 0;
+#endif
default:
break;
}