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From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Arnd Bergmann <arnd@arndb.de>,
	"H. Peter Anvin" <hpa@zytor.com>
Cc: Andi Kleen <ak@linux.intel.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Andy Lutomirski <luto@amacapital.net>,
	linux-arch@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: [RFC, PATCHv1 16/28] x86/asm: remove __VIRTUAL_MASK_SHIFT==47 assert
Date: Thu,  8 Dec 2016 19:21:38 +0300	[thread overview]
Message-ID: <20161208162150.148763-18-kirill.shutemov@linux.intel.com> (raw)
In-Reply-To: <20161208162150.148763-1-kirill.shutemov@linux.intel.com>

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 <kirill.shutemov@linux.intel.com>
---
 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 02fff3ebfb87..92a6753f8c85 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -267,12 +267,9 @@ 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
 
-- 
2.10.2

  parent reply	other threads:[~2016-12-08 16:22 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-08 16:21 [RFC, PATCHv1 00/28] 5-level paging Kirill A. Shutemov
2016-12-08 16:21 ` [QEMU, PATCH] x86: implement la57 paging mode Kirill A. Shutemov
2016-12-08 16:48   ` [Qemu-devel] " no-reply
2016-12-08 16:21 ` [RFC, PATCHv1 01/28] asm-generic: introduce 5level-fixup.h Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 02/28] asm-generic: introduce __ARCH_USE_5LEVEL_HACK Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 03/28] arch, mm: convert all architectures to use 5level-fixup.h Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 04/28] asm-generic: introduce <asm-generic/pgtable-nop4d.h> Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 05/28] mm: convert generic code to 5-level paging Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 06/28] x86: basic changes into headers for " Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 07/28] x86: trivial portion of 5-level paging conversion Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 08/28] x86/gup: add 5-level paging support Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 09/28] x86/ident_map: " Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 10/28] x86/mm: add support of p4d_t in vmalloc_fault() Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 11/28] x86/power: support p4d_t in hibernate code Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 12/28] x86/kexec: support p4d_t Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 13/28] x86: convert the rest of the code to " Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 14/28] mm: introduce __p4d_alloc() Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 15/28] x86: detect 5-level paging support Kirill A. Shutemov
2016-12-08 20:05   ` Borislav Petkov
2016-12-08 20:08     ` Linus Torvalds
2016-12-08 20:20       ` Borislav Petkov
2016-12-13 22:44         ` H. Peter Anvin
2016-12-13 23:07           ` Boris Petkov
2016-12-15 14:39             ` Borislav Petkov
2016-12-15 17:52               ` hpa
2016-12-15 19:09                 ` Borislav Petkov
2016-12-15 19:20                   ` Andi Kleen
2016-12-15 20:52                     ` hpa
2016-12-15 20:57                     ` hpa
2016-12-09 15:32     ` Kirill A. Shutemov
2016-12-09 16:33       ` Borislav Petkov
2016-12-13 22:50       ` H. Peter Anvin
2016-12-08 16:21 ` Kirill A. Shutemov [this message]
2016-12-08 18:39   ` [RFC, PATCHv1 16/28] x86/asm: remove __VIRTUAL_MASK_SHIFT==47 assert Andy Lutomirski
2016-12-08 19:22     ` Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 17/28] x86/mm: define virtual memory map for 5-level paging Kirill A. Shutemov
2016-12-08 18:56   ` Randy Dunlap
2016-12-08 19:24     ` Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 18/28] x86/paravirt: make paravirt code support " Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 19/28] x86/mm: basic defines/helpers for CONFIG_X86_5LEVEL Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 20/28] x86/dump_pagetables: support 5-level paging Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 21/28] x86/mm: extend kasan to " Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 22/28] x86/espfix: " Kirill A. Shutemov
2016-12-08 18:40   ` Andy Lutomirski
2016-12-12 14:22     ` Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 23/28] x86/mm: add support of additional page table level during early boot Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 24/28] x86/mm: add sync_global_pgds() for configuration with 5-level paging Kirill A. Shutemov
2016-12-08 18:42   ` Andy Lutomirski
2016-12-08 19:33     ` Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 25/28] x86/mm: make kernel_physical_mapping_init() support " Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 26/28] x86/mm: add support for 5-level paging for KASLR Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 27/28] x86: enable la57 support Kirill A. Shutemov
2016-12-08 16:21 ` [RFC, PATCHv1 28/28] TESTING-ONLY: bump TASK_SIZE_MAX Kirill A. Shutemov
2016-12-08 18:16 ` [RFC, PATCHv1 00/28] 5-level paging Linus Torvalds
2016-12-08 18:26   ` hpa
2016-12-08 19:20   ` Kirill A. Shutemov
2016-12-09  5:01 ` Ingo Molnar
2016-12-09 10:24   ` Arnd Bergmann
2016-12-09 10:51     ` Catalin Marinas
2016-12-09 10:37   ` Kirill A. Shutemov
2016-12-09 16:40     ` Andi Kleen
2016-12-09 17:21       ` Kirill A. Shutemov
2016-12-09 16:49     ` Dave Hansen
2016-12-13 21:06   ` Dave Hansen

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