From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f198.google.com (mail-pf0-f198.google.com [209.85.192.198]) by kanga.kvack.org (Postfix) with ESMTP id 751D16B0398 for ; Mon, 6 Mar 2017 08:54:21 -0500 (EST) Received: by mail-pf0-f198.google.com with SMTP id v190so69907230pfb.5 for ; Mon, 06 Mar 2017 05:54:21 -0800 (PST) Received: from mga02.intel.com (mga02.intel.com. [134.134.136.20]) by mx.google.com with ESMTPS id 88si19119992pla.240.2017.03.06.05.54.20 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 06 Mar 2017 05:54:20 -0800 (PST) From: "Kirill A. Shutemov" Subject: [PATCHv4 21/33] x86/asm: remove __VIRTUAL_MASK_SHIFT==47 assert Date: Mon, 6 Mar 2017 16:53:45 +0300 Message-Id: <20170306135357.3124-22-kirill.shutemov@linux.intel.com> In-Reply-To: <20170306135357.3124-1-kirill.shutemov@linux.intel.com> References: <20170306135357.3124-1-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: Linus Torvalds , Andrew Morton , x86@kernel.org, Thomas Gleixner , Ingo Molnar , Arnd Bergmann , "H. Peter Anvin" Cc: Andi Kleen , Dave Hansen , Andy Lutomirski , linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" We don't need it anymore. 17be0aec74fb ("x86/asm/entry/64: Implement better check for canonical addresses") made canonical address check generic wrt. address width. Signed-off-by: Kirill A. Shutemov --- arch/x86/entry/entry_64.S | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 044d18ebc43c..f07b4efb34d5 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -265,12 +265,9 @@ 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 */ - .ifne __VIRTUAL_MASK_SHIFT - 47 - .error "virtual address width changed -- SYSRET checks need update" - .endif - - /* Change top 16 bits to be the sign-extension of 47th bit */ 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