#ifndef _NET_DST_CACHE_H
#define _NET_DST_CACHE_H

#include <linux/jiffies.h>
#include <net/dst.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <net/ip6_fib.h>
#endif

struct dst_cache {
	struct dst_cache_pcpu __percpu *cache;
	unsigned long reset_ts;
};

/**
 *	dst_cache_get - perform cache lookup
 *	@dst_cache: the cache
 *
 *	The caller should use dst_cache_get_ip4() if it need to retrieve the
 *	source address to be used when xmitting to the cached dst.
 *	local BH must be disabled.
 */
struct dst_entry *dst_cache_get(struct dst_cache *dst_cache);

/**
 *	dst_cache_get_ip4 - perform cache lookup and fetch ipv4 source address
 *	@dst_cache: the cache
 *	@saddr: return value for the retrieved source address
 *
 *	local BH must be disabled.
 */
struct rtable *dst_cache_get_ip4(struct dst_cache *dst_cache, __be32 *saddr);

/**
 *	dst_cache_set_ip4 - store the ipv4 dst into the cache
 *	@dst_cache: the cache
 *	@dst: the entry to be cached
 *	@saddr: the source address to be stored inside the cache
 *
 *	local BH must be disabled.
 */
void dst_cache_set_ip4(struct dst_cache *dst_cache, struct dst_entry *dst,
		       __be32 saddr);

#if IS_ENABLED(CONFIG_IPV6)

/**
 *	dst_cache_set_ip6 - store the ipv6 dst into the cache
 *	@dst_cache: the cache
 *	@dst: the entry to be cached
 *	@saddr: the source address to be stored inside the cache
 *
 *	local BH must be disabled.
 */
void dst_cache_set_ip6(struct dst_cache *dst_cache, struct dst_entry *dst,
		       const struct in6_addr *addr);

/**
 *	dst_cache_get_ip6 - perform cache lookup and fetch ipv6 source address
 *	@dst_cache: the cache
 *	@saddr: return value for the retrieved source address
 *
 *	local BH must be disabled.
 */
struct dst_entry *dst_cache_get_ip6(struct dst_cache *dst_cache,
				    struct in6_addr *saddr);
#endif

/**
 *	dst_cache_reset - invalidate the cache contents
 *	@dst_cache: the cache
 *
 *	This do not free the cached dst to avoid races and contentions.
 *	the dst will be freed on later cache lookup.
 */
static inline void dst_cache_reset(struct dst_cache *dst_cache)
{
	dst_cache->reset_ts = jiffies;
}

/**
 *	dst_cache_init - initialize the cache, allocating the required storage
 *	@dst_cache: the cache
 *	@gfp: allocation flags
 */
int dst_cache_init(struct dst_cache *dst_cache, gfp_t gfp);

/**
 *	dst_cache_destroy - empty the cache and free the allocated storage
 *	@dst_cache: the cache
 *
 *	No synchronization is enforced: it must be called only when the cache
 *	is unsed.
 */
void dst_cache_destroy(struct dst_cache *dst_cache);

#endif
ptions</b><form method='get'><input type='hidden' name='id' value='1d7ac6aec947d222042b6d22b3cec109db4fd19e'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Sebastian Andrzej Siewior &lt;bigeasy@linutronix.de&gt;</td><td class='right'>2016-08-18 14:57:20 +0200</td></tr>
<tr><th>committer</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2016-09-06 18:30:20 +0200</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=1d7ac6aec947d222042b6d22b3cec109db4fd19e'>1d7ac6aec947d222042b6d22b3cec109db4fd19e</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=1d7ac6aec947d222042b6d22b3cec109db4fd19e'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=1d7ac6aec947d222042b6d22b3cec109db4fd19e'>b89b1745cde730a020147b6e54d0c93c4c405a87</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=a96a87bf949d249039cdf532bb5f5d06622cc5e2'>a96a87bf949d249039cdf532bb5f5d06622cc5e2</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=1d7ac6aec947d222042b6d22b3cec109db4fd19e&amp;id2=a96a87bf949d249039cdf532bb5f5d06622cc5e2'>diff</a>)</td></tr></table>
<div class='commit-subject'>mm/writeback: Convert to hotplug state machine</div><div class='commit-msg'>Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs.

Signed-off-by: Sebastian Andrzej Siewior &lt;bigeasy@linutronix.de&gt;
Cc: Peter Zijlstra &lt;peterz@infradead.org&gt;
Cc: Jens Axboe &lt;axboe@fb.com&gt;
Cc: linux-mm@kvack.org
Cc: rt@linutronix.de
Cc: Tejun Heo &lt;tj@kernel.org&gt;
Link: http://lkml.kernel.org/r/20160818125731.27256-6-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;

</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=1d7ac6aec947d222042b6d22b3cec109db4fd19e'>Diffstat</a></div><table summary='diffstat' class='diffstat'>