linux-kernel - Re: [PATCH] sound/oss: convert to unlocked

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Date:	Mon, 12 Jul 2010 23:13:03 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Jaroslav Kysela <perex@...ex.cz>,
	LKML <linux-kernel@...r.kernel.org>,
	John Kacur <jkacur@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	ALSA development <alsa-devel@...a-project.org>
Subject: Re: [PATCH] sound/oss: convert to unlocked_ioctl

On Monday 12 July 2010 22:38:25 Takashi Iwai wrote:
> Now the rest is eliminating each lock_kernel() in sound/oss/*.c :)

For other files, I've used a script (see below) to do this, it probably
works with the OSS files as well, although I have not tried yet.

Of course, another option for OSS device drivers would be to
remove the entire driver ;). Either way, my feeling is that the
OSS drivers are not stopping anyone from building a kernel without
CONFIG_BKL once we have introduced that symbol and made the drivers
depend on it.

	Arnd

---
#!/bin/bash
file=$1
name=$2
if grep -q lock_kernel ${file} ; then
    if grep -q 'include.*linux.mutex.h' ${file} ; then
            sed -i '/include.*<linux\/smp_lock.h>/d' ${file}
    else
            sed -i 's/include.*<linux\/smp_lock.h>.*$/include <linux\/mutex.h>/g' ${file}
    fi
    sed -i ${file} \
        -e "/^#include.*linux.mutex.h/,$ {
                1,/^\(static\|int\|long\)/ {
                     /^\(static\|int\|long\)/istatic DEFINE_MUTEX(${name}_mutex);

} }"  \
    -e "s/\(un\)*lock_kernel\>[ ]*()/mutex_\1lock(\&${name}_mutex)/g" \
    -e '/[      ]*cycle_kernel_lock();/d'
else
    sed -i -e '/include.*\<smp_lock.h\>/d' ${file}  \
                -e '/cycle_kernel_lock()/d'
fi
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