11bcb32848
"[PATCH 0/3] RFC - module.h usage cleanups in fs/ and lib/" https://lkml.org/lkml/2012/2/29/589 -- Fix up files in fs/ and lib/ dirs to only use module.h if they really need it. These are trivial in scope vs. the work done previously. We now have things where any few remaining cleanups can be farmed out to arch or subsystem maintainers, and I have done so when possible. What is remaining here represents the bits that don't clearly lie within a single arch/subsystem boundary, like the fs dir and the lib dir. Some duplicate includes arising from overlapping fixes from independent subsystem maintainer submissions are also quashed. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAABAgAGBQJPbNw3AAoJEOvOhAQsB9HWA7wQALrsQ6V6Z+B3KsvSoD5kFnpZ Y+4uggs+GdUdWmtRrZnTBp896gGuUgBxc3syA2XWd7Oqi49+c5c1m0cFxKyVdIHm fB+jmxS69soADtHR3cXmxcQshrUzUf2rTn8frcw4O/BmJuplv4xT9uPQzwGaRSZT gomQsQ1bGnkwjO2jfS8f/N5Mjr8u/z0WF7TTOTUSq+Cv3BervPaSPF1Ea6J8oo+N 4+/n8RlU1HWiI4inrgrFPN6UHmE45BAL2xGbB47LgooHJW8P5kAnU+vxGScaoy1Q JKX9WKT3VCiwR3VOPa86iLKP3Y8a3VlhyGn+yzzcYkGX/n0tbT7aoRhQm21sGIv0 DoeXWe7aiiY8cEW69G6GIfRPFl+Zh81m1Whbu7IZT/sV3asx6jWmEXE8CgCfeDt5 mNQk9D4Irf6+rmCSbeSVC4L0eFfLxNFouNyh2aus/q+gIjKNKYwZQryHrodK4wpv UgMKSTZfPrTAWay2gCNWNqo3Zs8e1LDqkftetxeU3jx2kTuaNzBl4Y7mhsX7sLYe MsFX3JUJ2pn6XWbgqcY+bdr/mzgsCrjzqdf15MTUzEc5SIfVF+XpNNZN1ITwl6UA /ZH9keBu1mEdCoPU5W74kYwx4p35hIeWJGfc0MRp07ruf941F+SBgMD11B0+06f0 pN0DcITTkD16+sS4x1cB =Z4w0 -----END PGP SIGNATURE----- Merge tag 'module-for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux Pull cleanup of fs/ and lib/ users of module.h from Paul Gortmaker: "Fix up files in fs/ and lib/ dirs to only use module.h if they really need it. These are trivial in scope vs the work done previously. We now have things where any few remaining cleanups can be farmed out to arch or subsystem maintainers, and I have done so when possible. What is remaining here represents the bits that don't clearly lie within a single arch/subsystem boundary, like the fs dir and the lib dir. Some duplicate includes arising from overlapping fixes from independent subsystem maintainer submissions are also quashed." Fix up trivial conflicts due to clashes with other include file cleanups (including some due to the previous bug.h cleanup pull). * tag 'module-for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux: lib: reduce the use of module.h wherever possible fs: reduce the use of module.h wherever possible includecheck: delete any duplicate instances of module.h
108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
/*
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* Generic Timer-queue
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*
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* Manages a simple queue of timers, ordered by expiration time.
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* Uses rbtrees for quick list adds and expiration.
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*
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* NOTE: All of the following functions need to be serialized
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* to avoid races. No locking is done by this library code.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/bug.h>
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#include <linux/timerqueue.h>
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#include <linux/rbtree.h>
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#include <linux/export.h>
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/**
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* timerqueue_add - Adds timer to timerqueue.
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*
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* @head: head of timerqueue
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* @node: timer node to be added
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*
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* Adds the timer node to the timerqueue, sorted by the
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* node's expires value.
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*/
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void timerqueue_add(struct timerqueue_head *head, struct timerqueue_node *node)
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{
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struct rb_node **p = &head->head.rb_node;
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struct rb_node *parent = NULL;
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struct timerqueue_node *ptr;
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/* Make sure we don't add nodes that are already added */
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WARN_ON_ONCE(!RB_EMPTY_NODE(&node->node));
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while (*p) {
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parent = *p;
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ptr = rb_entry(parent, struct timerqueue_node, node);
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if (node->expires.tv64 < ptr->expires.tv64)
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p = &(*p)->rb_left;
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else
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p = &(*p)->rb_right;
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}
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rb_link_node(&node->node, parent, p);
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rb_insert_color(&node->node, &head->head);
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if (!head->next || node->expires.tv64 < head->next->expires.tv64)
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head->next = node;
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}
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EXPORT_SYMBOL_GPL(timerqueue_add);
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/**
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* timerqueue_del - Removes a timer from the timerqueue.
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*
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* @head: head of timerqueue
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* @node: timer node to be removed
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*
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* Removes the timer node from the timerqueue.
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*/
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void timerqueue_del(struct timerqueue_head *head, struct timerqueue_node *node)
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{
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WARN_ON_ONCE(RB_EMPTY_NODE(&node->node));
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/* update next pointer */
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if (head->next == node) {
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struct rb_node *rbn = rb_next(&node->node);
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head->next = rbn ?
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rb_entry(rbn, struct timerqueue_node, node) : NULL;
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}
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rb_erase(&node->node, &head->head);
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RB_CLEAR_NODE(&node->node);
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}
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EXPORT_SYMBOL_GPL(timerqueue_del);
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/**
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* timerqueue_iterate_next - Returns the timer after the provided timer
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*
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* @node: Pointer to a timer.
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*
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* Provides the timer that is after the given node. This is used, when
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* necessary, to iterate through the list of timers in a timer list
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* without modifying the list.
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*/
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struct timerqueue_node *timerqueue_iterate_next(struct timerqueue_node *node)
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{
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struct rb_node *next;
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if (!node)
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return NULL;
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next = rb_next(&node->node);
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if (!next)
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return NULL;
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return container_of(next, struct timerqueue_node, node);
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}
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EXPORT_SYMBOL_GPL(timerqueue_iterate_next);
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