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fs: Substitute rcu_access_pointer() for rcu_dereference_raw()
(Trivial patch.) If the code is looking at the RCU-protected pointer itself, but not dereferencing it, the rcu_dereference() functions can be downgraded to rcu_access_pointer(). This commit makes this downgrade in __alloc_fd(), which simply compares the RCU-protected pointer against NULL with no dereferencing. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Reviewed-by: Josh Triplett <josh@joshtriplett.org>
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@ -497,7 +497,7 @@ int __alloc_fd(struct files_struct *files,
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error = fd;
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#if 1
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/* Sanity check */
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if (rcu_dereference_raw(fdt->fd[fd]) != NULL) {
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if (rcu_access_pointer(fdt->fd[fd]) != NULL) {
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printk(KERN_WARNING "alloc_fd: slot %d not NULL!\n", fd);
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rcu_assign_pointer(fdt->fd[fd], NULL);
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}
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