kernel_optimize_test/drivers/tty/tty_mutex.c
Alan Cox 6d31a88cb2 tty: revert incorrectly applied lock patch
I sent GregKH this after the pre-requisites. He dropped the pre-requesites
for good reason and unfortunately then applied this patch. Without this
reverted you get random kernel memory corruption which will make bisecting
anything between it and the properly applied patches a complete sod.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-16 12:58:12 -07:00

33 lines
659 B
C

#include <linux/tty.h>
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/semaphore.h>
#include <linux/sched.h>
/*
* The 'big tty mutex'
*
* This mutex is taken and released by tty_lock() and tty_unlock(),
* replacing the older big kernel lock.
* It can no longer be taken recursively, and does not get
* released implicitly while sleeping.
*
* Don't use in new code.
*/
static DEFINE_MUTEX(big_tty_mutex);
/*
* Getting the big tty mutex.
*/
void __lockfunc tty_lock(void)
{
mutex_lock(&big_tty_mutex);
}
EXPORT_SYMBOL(tty_lock);
void __lockfunc tty_unlock(void)
{
mutex_unlock(&big_tty_mutex);
}
EXPORT_SYMBOL(tty_unlock);