linux-kernel - Re: [PATCH 1/2] headers: move release_kernel_lock(), reacquire_kernel

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Message-Id: <1225261764.20276.7.camel@brick>
Date:	Tue, 28 Oct 2008 23:29:24 -0700
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Alexey Dobriyan <adobriyan@...il.com>, torvalds@...l.org,
	viro@...iv.linux.org.uk, acme@...stprotocols.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] headers: move release_kernel_lock(),
 reacquire_kernel_lock() to sched.c

On Wed, 2008-10-29 at 07:18 +0100, Ingo Molnar wrote:
> * Alexey Dobriyan <adobriyan@...il.com> wrote:
> > +#ifdef CONFIG_LOCK_KERNEL
> > +/*
> > + * Release/re-acquire global kernel lock for the scheduler
> > + */
> > +#define release_kernel_lock(tsk) do { 		\
> > +	if (unlikely((tsk)->lock_depth >= 0))	\
> > +		__release_kernel_lock();	\
> > +} while (0)
> > +
> > +static inline int reacquire_kernel_lock(struct task_struct *task)
> > +{
> > +	if (unlikely(task->lock_depth >= 0))
> > +		return __reacquire_kernel_lock();
> > +	return 0;
> > +}
> > +#else
> > +#define release_kernel_lock(task)		do { } while(0)
> > +#define reacquire_kernel_lock(task)		0
> > +#endif
> 

Also is it possible to keep them as inlines in both the CONFIG_LOCK_KERNEL
and !CONFIG_LOCK_KERNEL

Something like (without checking if release_kernel_lock _can_ be an inline:

static inline void release_kernel_lock(struct task_struct *task)
{
#ifdef CONFIG_LOCK_KERNEL
	if (unlikely(task->lock_depth >= 0))
		__release_kernel_lock();
#endif
	return;
}

static inline int reacquire_kernel_lock(struct task_struct *task)
{
#ifdef CONFIG_LOCK_KERNEL
	if (unlikely(task->lock_depth >= 0))
		return __reacquire_kernel_lock();
#endif
	return 0;
}

Then the typechecking is kept in both CONFIG_LOCK_KERNEL/!CONFIG_LOCK_KERNEL

Cheers,

Harvey

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