file_operations的ioctl没了，顺便学一下使用git查commit，发觉现在学驱动开发挺悲催的，很多例程都要改，有没有与时俱进的教材？希望有知道的朋友推荐一些。
1、git log -S.ioctl
找到了
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commit b19dd42faf413b4705d4adb38521e82d73fa4249
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Author: Arnd Bergmann <arnd@arndb.de>
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Date: Sun Jul 4 00:15:10 2010 +0200
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bkl: Remove locked .ioctl file operation
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The last user is gone, so we can safely remove this
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Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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Cc: John Kacur <jkacur@redhat.com>
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Cc: Al Viro <viro@ZenIV.linux.org.uk>
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Cc: Thomas Gleixner <tglx@linutronix.de>
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Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
2、参考了大神的http://blog.chinaunix.net/uid-20543672-id-3015637.html
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