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Date: Tue, 20 Oct 2009 07:27:38 +0200 (CEST) From: Thomas Gleixner <tglx@...utronix.de> To: Artem Bityutskiy <dedekind1@...il.com> 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 Fri, 16 Oct 2009, Artem Bityutskiy wrote: > 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’ Yeah, found and fixed that already. tglx
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