From 4ae73f2d53255c388d50bf83c1681112a6f9cba1 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 26 May 2012 10:14:39 -0700 Subject: x86: use generic strncpy_from_user routine The generic strncpy_from_user() is not really optimal, since it is designed to work on both little-endian and big-endian. And on little-endian you can simplify much of the logic to find the first zero byte, since little-endian arithmetic doesn't have to worry about the carry bit propagating into earlier bytes (only later bytes, which we don't care about). But I have patches to make the generic routines use the architecture- specific infrastructure, so that we can regain the little-endian optimizations. But before we do that, switch over to the generic routines to make the patches each do just one well-defined thing. Signed-off-by: Linus Torvalds --- arch/x86/include/asm/uaccess.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/x86/include/asm/uaccess.h') diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h index 851fe0dc13bc..1354facd8f63 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -32,6 +32,7 @@ #define segment_eq(a, b) ((a).seg == (b).seg) +#define user_addr_max() (current_thread_info()->addr_limit.seg) #define __addr_ok(addr) \ ((unsigned long __force)(addr) < \ (current_thread_info()->addr_limit.seg)) -- cgit v1.2.1