Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753808Ab0HBPQN (ORCPT ); Mon, 2 Aug 2010 11:16:13 -0400 Received: from hera.kernel.org ([140.211.167.34]:53965 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752732Ab0HBPQL (ORCPT ); Mon, 2 Aug 2010 11:16:11 -0400 Date: Mon, 2 Aug 2010 15:15:54 GMT From: tip-bot for Brian Gerst Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@redhat.com, brgerst@gmail.com, tglx@linutronix.de Reply-To: mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org, brgerst@gmail.com, tglx@linutronix.de In-Reply-To: <1280594903-6341-1-git-send-email-brgerst@gmail.com> References: <1280594903-6341-1-git-send-email-brgerst@gmail.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/asm] x86-64, asm: Directly access per-cpu IST Message-ID: Git-Commit-ID: c15a5958a0b6dbf06b3c05972694f04a0c50a4cf X-Mailer: tip-git-log-daemon MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.3 (hera.kernel.org [127.0.0.1]); Mon, 02 Aug 2010 15:15:55 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1742 Lines: 49 Commit-ID: c15a5958a0b6dbf06b3c05972694f04a0c50a4cf Gitweb: http://git.kernel.org/tip/c15a5958a0b6dbf06b3c05972694f04a0c50a4cf Author: Brian Gerst AuthorDate: Sat, 31 Jul 2010 12:48:22 -0400 Committer: H. Peter Anvin CommitDate: Sun, 1 Aug 2010 16:05:17 -0700 x86-64, asm: Directly access per-cpu IST Use a direct per-cpu reference for the IST instead of using a scratch register. Signed-off-by: Brian Gerst LKML-Reference: <1280594903-6341-1-git-send-email-brgerst@gmail.com> Signed-off-by: H. Peter Anvin --- arch/x86/kernel/entry_64.S | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S index 4db7c4d..59af275 100644 --- a/arch/x86/kernel/entry_64.S +++ b/arch/x86/kernel/entry_64.S @@ -1065,6 +1065,7 @@ ENTRY(\sym) END(\sym) .endm +#define INIT_TSS_IST(x) PER_CPU_VAR(init_tss) + (TSS_ist + ((x) - 1) * 8) .macro paranoidzeroentry_ist sym do_sym ist ENTRY(\sym) INTR_FRAME @@ -1076,10 +1077,9 @@ ENTRY(\sym) TRACE_IRQS_OFF movq %rsp,%rdi /* pt_regs pointer */ xorl %esi,%esi /* no error code */ - PER_CPU(init_tss, %r12) - subq $EXCEPTION_STKSZ, TSS_ist + (\ist - 1) * 8(%r12) + subq $EXCEPTION_STKSZ, INIT_TSS_IST(\ist) call \do_sym - addq $EXCEPTION_STKSZ, TSS_ist + (\ist - 1) * 8(%r12) + addq $EXCEPTION_STKSZ, INIT_TSS_IST(\ist) jmp paranoid_exit /* %ebx: no swapgs flag */ CFI_ENDPROC END(\sym) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/