From 1494d41d0a20a1facff7558ff825a2681b419e9d Mon Sep 17 00:00:00 2001 From: Michael Brown Date: Mon, 5 Nov 2012 16:09:38 +0000 Subject: [uaccess] Add userptr_sub() to find the difference between two user pointers Signed-off-by: Michael Brown --- src/include/ipxe/linux/linux_uaccess.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'src/include/ipxe/linux') diff --git a/src/include/ipxe/linux/linux_uaccess.h b/src/include/ipxe/linux/linux_uaccess.h index 1b4961177..e4dfdd357 100644 --- a/src/include/ipxe/linux/linux_uaccess.h +++ b/src/include/ipxe/linux/linux_uaccess.h @@ -71,6 +71,12 @@ UACCESS_INLINE(linux, userptr_add)(userptr_t userptr, off_t offset) return trivial_userptr_add(userptr, offset); } +static inline __always_inline off_t +UACCESS_INLINE(linux, userptr_sub)(userptr_t userptr, userptr_t subtrahend) +{ + return trivial_userptr_sub ( userptr, subtrahend ); +} + static inline __always_inline void UACCESS_INLINE(linux, memcpy_user)(userptr_t dest, off_t dest_off, userptr_t src, off_t src_off, size_t len) { -- cgit v1.2.3-55-g7522