From 72f924783b8a87e4454516520ffb5f35e4930371 Mon Sep 17 00:00:00 2001 From: Andy Lutomirski Date: Mon, 5 Oct 2015 17:47:54 -0700 Subject: [PATCH] x86/entry, locking/lockdep: Move lockdep_sys_exit() to prepare_exit_to_usermode() Rather than worrying about exactly where LOCKDEP_SYS_EXIT should go in the asm code, add it to prepare_exit_from_usermode() and remove all of the asm calls that are followed by prepare_exit_to_usermode(). LOCKDEP_SYS_EXIT now appears only in the syscall fast paths. Signed-off-by: Andy Lutomirski Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/1736ebe948b845e68120b86b89091f3ec27f5e8e.1444091584.git.luto@kernel.org Signed-off-by: Ingo Molnar --- arch/x86/entry/common.c | 2 ++ arch/x86/entry/entry_32.S | 2 -- arch/x86/entry/entry_64.S | 1 - 3 files changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c index 80dcc9261ca3..d94a60c16029 100644 --- a/arch/x86/entry/common.c +++ b/arch/x86/entry/common.c @@ -220,6 +220,8 @@ __visible void prepare_exit_to_usermode(struct pt_regs *regs) if (WARN_ON(!irqs_disabled())) local_irq_disable(); + lockdep_sys_exit(); + /* * In order to return to user mode, we need to have IRQs off with * none of _TIF_SIGPENDING, _TIF_NOTIFY_RESUME, _TIF_USER_RETURN_NOTIFY, diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S index b2909bf8cf70..a08ded481aba 100644 --- a/arch/x86/entry/entry_32.S +++ b/arch/x86/entry/entry_32.S @@ -255,7 +255,6 @@ ret_from_intr: jb resume_kernel # not returning to v8086 or userspace ENTRY(resume_userspace) - LOCKDEP_SYS_EXIT DISABLE_INTERRUPTS(CLBR_ANY) TRACE_IRQS_OFF movl %esp, %eax @@ -372,7 +371,6 @@ syscall_call: syscall_after_call: movl %eax, PT_EAX(%esp) # store the return value syscall_exit: - LOCKDEP_SYS_EXIT jmp syscall_exit_work restore_all: diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 055a01de7c8d..7dc285036b6d 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -557,7 +557,6 @@ ret_from_intr: jz retint_kernel /* Interrupt came from user space */ - LOCKDEP_SYS_EXIT_IRQ GLOBAL(retint_user) mov %rsp,%rdi call prepare_exit_to_usermode