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| author | Christoph Hellwig <hch@lst.de> | 2019-04-23 18:38:09 +0200 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2019-04-23 21:51:41 +0200 |
| commit | 6edd1dbace0e8529ed167e8a5f9da63c0cc763cc (patch) | |
| tree | 157e43dccba6b1bd1a4c2bf3277c6b9d7359e850 | |
| parent | bd79f94758c011bdffd8d4afcfb578d169cb5e93 (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.h | 10 |
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; } |