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asm-generic: optimize generic uaccess for 8-byte loads and stores

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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>
This commit is contained in:
Christoph Hellwig 2019-04-23 18:38:09 +02:00 committed by Arnd Bergmann
parent bd79f94758
commit 6edd1dbace
1 changed files with 10 additions and 0 deletions
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10
include/asm-generic/uaccess.h
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@ -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;
}