linux-kernel - [PATCH 4/4] Remove last BKL leftover: lock

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Date:	Fri,  6 May 2011 14:05:28 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	linux-kernel@...r.kernel.org
Cc:	peterz@...radead.org, arnd@...db.de, akpm@...ux-foundation.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 4/4] Remove last BKL leftover: lock_depth

From: Andi Kleen <ak@...ux.intel.com>

This was the (hopefully) last BKL leftover: the per task lock_depth
field.

After all users are gone remove the task_struct lock_depth field.
Depending on the configuration this will not actually shrink task_struct
unfortunately due to padding. It helps a bit on 32bit. And on 64bit
it allows new bloat.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 include/linux/init_task.h |    1 -
 include/linux/sched.h     |    2 --
 kernel/fork.c             |    1 -
 3 files changed, 0 insertions(+), 4 deletions(-)

diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index caa151f..689496b 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -134,7 +134,6 @@ extern struct cred init_cred;
 	.stack		= &init_thread_info,				\
 	.usage		= ATOMIC_INIT(2),				\
 	.flags		= PF_KTHREAD,					\
-	.lock_depth	= -1,						\
 	.prio		= MAX_PRIO-20,					\
 	.static_prio	= MAX_PRIO-20,					\
 	.normal_prio	= MAX_PRIO-20,					\
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 53373bc..006c31f 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1193,8 +1193,6 @@ struct task_struct {
 	unsigned int flags;	/* per process flags, defined below */
 	unsigned int ptrace;
 
-	int lock_depth;		/* BKL lock depth */
-
 #ifdef CONFIG_SMP
 #ifdef __ARCH_WANT_UNLOCKED_CTXSW
 	int oncpu;
diff --git a/kernel/fork.c b/kernel/fork.c
index e7548de..aca6287 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1103,7 +1103,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 
 	posix_cpu_timers_init(p);
 
-	p->lock_depth = -1;		/* -1 = no lock */
 	do_posix_clock_monotonic_gettime(&p->start_time);
 	p->real_start_time = p->start_time;
 	monotonic_to_bootbased(&p->real_start_time);
-- 
1.7.4.4

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