linux-kernel - Re: [patch 4/5] mtd: Remove BKL and convert to unlocked

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Date:	Fri, 16 Oct 2009 09:44:00 +0300
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	ALan Cox <alan@...rguk.ukuu.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org
Subject: Re: [patch 4/5] mtd: Remove BKL and convert to unlocked_ioctl

On Thu, 2009-10-15 at 20:28 +0000, Thomas Gleixner wrote:
> plain text document attachment
> (mtd-remove-bkl-and-convert-to-unlocked-ioctl.patch)
> mtd_open() got lock/unlock kernel from the big BKL push down, but it
> never relied on the BKL serialization as get_mtd_device() takes care
> of serialization vs. device init/teardown.
> 
> mtd_ioctl() is safe w/o the BKL as well. The data which is copied from
> the mtd data structure is either set up during device initialization
> or statistics which have never been protected by the BKL against
> concurrent modification. The mtd functions which are called from
> various ioctl commands are safe as well.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: David Woodhouse <dwmw2@...radead.org>
> Cc: linux-mtd@...ts.infradead.org
> ---
>  drivers/mtd/mtdchar.c |   30 ++++++++----------------------
>  1 file changed, 8 insertions(+), 22 deletions(-)

[dedekind@eru l2-mtd-2.6.git]$ make -j8
  CHK     include/linux/version.h
  CHK     include/linux/utsrelease.h
  SYMLINK include/asm -> include/asm-x86
  CALL    scripts/checksyscalls.sh
  CHK     include/linux/compile.h
  CC [M]  drivers/mtd/mtdchar.o
drivers/mtd/mtdchar.c: In function ‘mtd_compat_ioctl’:
drivers/mtd/mtdchar.c:865: warning: passing argument 1 of ‘mtd_ioctl’ from incompatible pointer type
drivers/mtd/mtdchar.c:444: note: expected ‘struct file *’ but argument is of type ‘struct inode *’
drivers/mtd/mtdchar.c:865: warning: passing argument 2 of ‘mtd_ioctl’ makes integer from pointer without a cast
drivers/mtd/mtdchar.c:444: note: expected ‘u_int’ but argument is of type ‘struct file *’
drivers/mtd/mtdchar.c:865: error: too many arguments to function ‘mtd_ioctl’

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)

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