tree 27ba0332ccec257e2e69d02875da6d32f2153540
parent fb07a5f857ac8a2035d3f642317b0119b1056a7f
author Arnd Bergmann <arnd@arndb.de> 1255652725 +0200
committer Arnd Bergmann <arnd@arndb.de> 1260481928 +0100

compat_ioctl: Remove BKL

We have always called ioctl conversion handlers under the big kernel lock,
although that is generally not necessary.  In particular it is not needed
for conversion of data structures and for calling sys_ioctl or
do_vfs_ioctl, which will get the BKL again if needed.

Handlers doing more than those two have been moved out, so we can kill off
the BKL from compat_sys_ioctl.  This may significantly improve latencies
with 32 bit applications, and it avoids a common scenario where a thread
acquires the BKL twice.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>