Commit-ID: 361b4b58ec4cf123e12a773909c6454dbd5e6dbc Gitweb: http://git.kernel.org/tip/361b4b58ec4cf123e12a773909c6454dbd5e6dbc Author: Kirill A. Shutemov <kirill.shute...@linux.intel.com> AuthorDate: Thu, 30 Mar 2017 11:07:26 +0300 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Tue, 4 Apr 2017 08:22:33 +0200
x86/asm: Remove __VIRTUAL_MASK_SHIFT==47 assert We don't need the assert anymore, as: 17be0aec74fb ("x86/asm/entry/64: Implement better check for canonical addresses") made canonical address checks generic wrt. address width. Signed-off-by: Kirill A. Shutemov <kirill.shute...@linux.intel.com> Cc: Andrew Morton <a...@linux-foundation.org> Cc: Andy Lutomirski <l...@amacapital.net> Cc: Andy Lutomirski <l...@kernel.org> Cc: Borislav Petkov <b...@alien8.de> Cc: Brian Gerst <brge...@gmail.com> Cc: Dave Hansen <dave.han...@intel.com> Cc: Denys Vlasenko <dvlas...@redhat.com> Cc: H. Peter Anvin <h...@zytor.com> Cc: Josh Poimboeuf <jpoim...@redhat.com> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Thomas Gleixner <t...@linutronix.de> Cc: linux-a...@vger.kernel.org Cc: linux...@kvack.org Link: http://lkml.kernel.org/r/20170330080731.65421-3-kirill.shute...@linux.intel.com Signed-off-by: Ingo Molnar <mi...@kernel.org> --- 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 044d18e..f07b4ef 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