From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751284AbbC0Ls2 (ORCPT ); Fri, 27 Mar 2015 07:48:28 -0400 Received: from terminus.zytor.com ([198.137.202.10]:37405 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932074AbbC0LsY (ORCPT ); Fri, 27 Mar 2015 07:48:24 -0400 Date: Fri, 27 Mar 2015 04:47:50 -0700 From: tip-bot for Denys Vlasenko Message-ID: Cc: mingo@kernel.org, rostedt@goodmis.org, wad@chromium.org, linux-kernel@vger.kernel.org, fweisbec@gmail.com, hpa@zytor.com, dvlasenk@redhat.com, bp@alien8.de, luto@amacapital.net, ast@plumgrid.com, keescook@chromium.org, oleg@redhat.com, tglx@linutronix.de, torvalds@linux-foundation.org Reply-To: dvlasenk@redhat.com, hpa@zytor.com, luto@amacapital.net, bp@alien8.de, ast@plumgrid.com, keescook@chromium.org, oleg@redhat.com, tglx@linutronix.de, torvalds@linux-foundation.org, mingo@kernel.org, rostedt@goodmis.org, wad@chromium.org, fweisbec@gmail.com, linux-kernel@vger.kernel.org In-Reply-To: <1427314468-12763-4-git-send-email-dvlasenk@redhat.com> References: <1427314468-12763-4-git-send-email-dvlasenk@redhat.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/asm] x86/irq/tracing: Do not save callee-preserved registers around lockdep_sys_exit_thunk Git-Commit-ID: aa6d9a128b861fe7e9dc37bcc37179837674b739 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: aa6d9a128b861fe7e9dc37bcc37179837674b739 Gitweb: http://git.kernel.org/tip/aa6d9a128b861fe7e9dc37bcc37179837674b739 Author: Denys Vlasenko AuthorDate: Wed, 25 Mar 2015 21:14:28 +0100 Committer: Ingo Molnar CommitDate: Fri, 27 Mar 2015 10:01:49 +0100 x86/irq/tracing: Do not save callee-preserved registers around lockdep_sys_exit_thunk Internally, lockdep_sys_exit_thunk saves callee-clobbered registers, and calls a C function, lockdep_sys_exit. Thus, callee-preserved registers won't be mangled, there is no need to save them. Patch was run-tested. Signed-off-by: Denys Vlasenko Cc: Alexei Starovoitov Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Frederic Weisbecker Cc: H. Peter Anvin Cc: Kees Cook Cc: Linus Torvalds Cc: Oleg Nesterov Cc: Steven Rostedt Cc: Will Drewry Link: http://lkml.kernel.org/r/1427314468-12763-4-git-send-email-dvlasenk@redhat.com Signed-off-by: Ingo Molnar --- arch/x86/include/asm/irqflags.h | 2 -- 1 file changed, 2 deletions(-) diff --git a/arch/x86/include/asm/irqflags.h b/arch/x86/include/asm/irqflags.h index 19355f3..9a63eae 100644 --- a/arch/x86/include/asm/irqflags.h +++ b/arch/x86/include/asm/irqflags.h @@ -179,9 +179,7 @@ static inline int arch_irqs_disabled(void) # define LOCKDEP_SYS_EXIT_IRQ \ TRACE_IRQS_ON; \ sti; \ - SAVE_EXTRA_REGS; \ call lockdep_sys_exit_thunk; \ - RESTORE_EXTRA_REGS; \ cli; \ TRACE_IRQS_OFF; # else