From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f71.google.com (mail-pg0-f71.google.com [74.125.83.71]) by kanga.kvack.org (Postfix) with ESMTP id 70EEC6B02FA for ; Wed, 24 May 2017 05:54:31 -0400 (EDT) Received: by mail-pg0-f71.google.com with SMTP id q125so108657245pgq.8 for ; Wed, 24 May 2017 02:54:31 -0700 (PDT) Received: from mga07.intel.com (mga07.intel.com. [134.134.136.100]) by mx.google.com with ESMTPS id m23si2098306pli.111.2017.05.24.02.54.30 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 24 May 2017 02:54:30 -0700 (PDT) From: "Kirill A. Shutemov" Subject: [PATCHv6 02/10] x86/asm: Fix comment in return_from_SYSCALL_64 Date: Wed, 24 May 2017 12:54:11 +0300 Message-Id: <20170524095419.14281-3-kirill.shutemov@linux.intel.com> In-Reply-To: <20170524095419.14281-1-kirill.shutemov@linux.intel.com> References: <20170524095419.14281-1-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: x86@kernel.org, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" Cc: Andi Kleen , Dave Hansen , Andy Lutomirski , Dan Williams , linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" On x86-64 __VIRTUAL_MASK_SHIFT depends on paging mode now. Signed-off-by: Kirill A. Shutemov --- arch/x86/entry/entry_64.S | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 607d72c4a485..edec30584eb8 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -266,7 +266,8 @@ return_from_SYSCALL_64: * If width of "canonical tail" ever becomes variable, this will need * to be updated to remain correct on both old and new CPUs. * - * Change top 16 bits to be the sign-extension of 47th bit + * Change top bits to match most significant bit (47th or 56th bit + * depending on paging mode) in the address. */ shl $(64 - (__VIRTUAL_MASK_SHIFT+1)), %rcx sar $(64 - (__VIRTUAL_MASK_SHIFT+1)), %rcx -- 2.11.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org