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由 Davidlohr Bueso 提交于
At the point of sysfs callback, the call to gup is done without mmap_sem (or any lock for that matter). This is racy. As such, use the get_user_pages_fast() alternative and safely avoid taking the lock, if possible. Signed-off-by: NDavidlohr Bueso <dbueso@suse.de> Signed-off-by: NTony Luck <tony.luck@intel.com>
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