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Subject[tip:x86/asm] x86/entry, locking/lockdep: Move lockdep_sys_exit() to prepare_exit_to_usermode()
Commit-ID:  72f924783b8a87e4454516520ffb5f35e4930371
Gitweb: http://git.kernel.org/tip/72f924783b8a87e4454516520ffb5f35e4930371
Author: Andy Lutomirski <luto@kernel.org>
AuthorDate: Mon, 5 Oct 2015 17:47:54 -0700
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Wed, 7 Oct 2015 11:34:07 +0200

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 <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1736ebe948b845e68120b86b89091f3ec27f5e8e.1444091584.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
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 80dcc92..d94a60c 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 b2909bf..a08ded4 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 055a01d..7dc2850 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

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