From 6edd1dbace0e8529ed167e8a5f9da63c0cc763cc Mon Sep 17 00:00:00 2001 From: Christoph Hellwig <hch@lst.de> Date: Tue, 23 Apr 2019 18:38:09 +0200 Subject: [PATCH] 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> --- include/asm-generic/uaccess.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/include/asm-generic/uaccess.h b/include/asm-generic/uaccess.h index 3dcabfceb21e3..e935318804f8a 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; } -- GitLab